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2024 Volume 52 Issue 3
Published: 20 March 2024
  
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  • Review
    Shuang WU, Yanzi GOU, Yongshou WANG, Quzhi SONG, Nana XU, Cheng HAN, Yingde WANG
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    Shuang WU, Yanzi GOU, Yongshou WANG, Quzhi SONG, Nana XU, Cheng HAN, Yingde WANG. Research progress in preparation of polymer-derived SiC fibers containing hetero elements[J]. Journal of Materials Engineering, 2024, 52(3): 1-11.

    Continuous SiC fibers reinforced SiC ceramic matrix composites have wide applications in the aerospace and nuclear fields owing to their excellent high-temperature resistance, good oxidation resistance and mechanical properties. The precursor-derived method has been the most important method for preparing continuous SiC fibers. The introduction of specific hetero elements could effectively improve properties of SiC fibers. Based on the research work on precursor-derived SiC fibers of high performance carried out by our group in the past forty years, this review firstly summarizes the addition methods of hetero elements, mainly including physical blending or chemical modification methods; The role and mechanism of hetero elements have been elucidated from several aspects: increasing the ceramic yield of the precursor, facilitating densification during sintering of the precursor-derived SiC fibers, improving high-temperature resistance of the final SiC fibers, and generating functions of SiC fibers; The composition, microstructure, properties, and developmental status of SiC fibers containing hetero elements, such as Ti, Al, Zr, Fe, B, as well as refractory metals (Hf, Ta, Nb), have been introduced. Furthermore, future research in the development of precursor systems, quantitative study of the relationship between the types and contents of hetero elements and properties of derived fibers, as well as engineering applications of the precursor-derived SiC fibers, has been prospected.

  • Review
    Weiyang YANG, Xianhao LI, Haibin YU, Weiguang PANG, Haiwen LUO
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    Weiyang YANG, Xianhao LI, Haibin YU, Weiguang PANG, Haiwen LUO. Research progress in normalizing of grain-oriented silicon steel and effect on secondary recrystallization[J]. Journal of Materials Engineering, 2024, 52(3): 12-21.

    The grain-oriented silicon steel is an important iron core material, and normalization is an indispensable industrial production process for the production of high magnetic induction grain-oriented silicon steel at present. It can adjust the structure, texture and inhibitor precipitation of hot-rolled band to improve the magnetic properties of silicon steel.The inheritance from hot rolled microstructures to normalized ones of grain-oriented silicon steel and the evolution law of inhibitor during the process of normalizing were summarized, and the influence of normalizing on the microstructure and texture of primary recrystallization and secondary recrystallization was mainly discussed. It is pointed out that the fine γ-oriented grain colonies formed during normalizing favour the final secondary recrystallization whilst the coarse and deformed α-/λ-oriented grains disfavour it. Finally, a three-stage normalization process and its parameters for optimizing magnetic properties of low-temperature heating nitriding type high magnetic induction grain-oriented silicon steel were recommended. The key research direction of normalizing in the future is to further simplify process on the basis of ensuring the same texture and inhibitor content, and rational application of normalizing process in the grain-oriented silicon steel produced by thin slab casting and rolling and strip casting.

  • Review
    Jiaqi LIU, Chaohui WANG, Wei LIN, Yuan YOU, Weidong CHENG, Meiling DONG, You WANG, Yuhang WANG, Zhongyu ZHU, Jinquan LIU
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    Jiaqi LIU, Chaohui WANG, Wei LIN, Yuan YOU, Weidong CHENG, Meiling DONG, You WANG, Yuhang WANG, Zhongyu ZHU, Jinquan LIU. Research progress in high-temperature failure behavior of MCrAlY metal bond-coat[J]. Journal of Materials Engineering, 2024, 52(3): 22-32.

    The MCrAlY(M=Ni, Co or NiCo)has become a widely used bond-coat material of thermal barrier coatings (TBCs) due to its advantages of high-temperature oxidation resistance and high thermal expansion coefficient, with the continuous increase in turbine inlet temperature of aero engines and gas turbines. However, the stress distribution at the interface between the bond and top coating in thermal barrier coatings becomes more complicated under a high-temperature service environment. The failure of the bond-coat leads to the spalling of the top coating, which limits the development of the thermal protection coating field. The development process of the bond-coat was briefly described.The failure behavior of the bond-coat interface due to high-temperature phase transition, increased thermal and growth stresses, and S-element diffusion was focused on, and the failure mechanism of the bond-coat interface was analyzed. The research on improving the bond-coat interface failure at home and abroad was summarized. The synergistic strengthening of MCrAlY by rare earth and nanoparticles is proposed, which provides a research direction for the future optimization design of thermal bond-coat systems.

  • Research Article
  • Research Article
    Youyu ZHU, Dechun REN, Bo LEI, Muchi JIANG, Xingyuan YANG, Yi LIU, Yusheng CAI, Haibin JI, Jiafeng LEI
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    Youyu ZHU, Dechun REN, Bo LEI, Muchi JIANG, Xingyuan YANG, Yi LIU, Yusheng CAI, Haibin JI, Jiafeng LEI. Microstructure and mechanical properties of superalloy in-situ reinforced titanium alloy composites by laser additive manufacturing[J]. Journal of Materials Engineering, 2024, 52(3): 33-43.

    TCGH(TC4+GH4169)composite material was prepared by selective laser melting(SLM). The optimum forming process parameters of TCGH composite material were investigated, and the microstructure and mechanical properties of as-deposited samples and heat-treated samples were studied. The results show that the optimum process parameters for fabrication of TCGH composite material are scanning speed of 900 mm/s with laser power of 150 W, and density higher than 99.5%. The addition of GH4169 powder changes the solid phase transformation behavior of TC4 titanium alloy material, and the as-deposited structure shows obvious high temperature solidification characteristics, which makes the forming characteristics of progressive scanning overlap and layer-by-layer scanning accumulation obvious. The original coarse columnar β grain size along the printing direction is significantly reduced, and the tensile strength of the composite is improved. Compared with the as-deposited sample, the microstructure of the heat-treated sample is transformed into a near-equiaxed structure. At the same time, with the increase of heat treatment temperature, the dissolution of the second phase leads to the dominant solid solution strengthening effect of the composite material, which improves the tensile strength and plasticity of the composite material.

  • Research Article
    Zize ZHAN, Junsheng ZHENG, Runlin FAN, Dongmei YAO, Jing CHEN, Pingwen MING
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    Zize ZHAN, Junsheng ZHENG, Runlin FAN, Dongmei YAO, Jing CHEN, Pingwen MING. Preparation process of graphite-based composite bipolar plate by vacuum impregnation[J]. Journal of Materials Engineering, 2024, 52(3): 44-51.

    The vacuum impregnation resin method was used to prepare composite bipolar plates in fuel cell in this study. The effects of the content of epoxy resin diluent added, temperature and pore structure of graphite on the impregnation content during the vacuum impregnation process were studied. The electrical conductivity, flexural strength and airtightness of the prepared fuel cell bipolar plates were investigated. The results show that increasing the content of diluent and temperature can reduce viscosity and increase the upper limit of resin impregnation, enabling the resin to impregnate and fill into smaller pores, while there are still some pores that cannot be filled and saturated, such as the pores below 0.1 μm are difficult to fully penetrate in the expanded graphite plate, resulting in the resin being unable to completely fill the entire pores of the expanded graphite. The optimal temperature for impregnating the epoxy resin/diluent system by vacuum impregnation is 50 ℃, and the optimal addition ratio of diluent ethylene glycol diglycidyl ether is 15%(mass fraction). The obtained bipolar plate has excellent electrical conductivity of 340.12 S/cm, flexural strength of 41.52 MPa, and helium permeability of 5.4×10-7 cm3·cm-2·s-1.

  • Research Article
    Yongle TONG, Yalei WANG, Rong LIU, Huaifei LIU, Nannan WU, Huicong CHENG
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    Yongle TONG, Yalei WANG, Rong LIU, Huaifei LIU, Nannan WU, Huicong CHENG. Synthesis of Er2SiO5 nano powders by cocurrent coprecipitation[J]. Journal of Materials Engineering, 2024, 52(3): 52-60.

    The nano-sized Er2SiO5 powders were prepared by cocurrent coprecipitation method using Er2O3 and tetraethyl orthosilicate (TEOS) as raw materials. The effects of precursor Si/Er molar ratio, calcination temperature, and pH value of reaction system on Er2SiO5 phase composition and microstructure were investigated, and the synthesis mechanism of Er2SiO5 powders was discussed. Results show that pure Er2SiO5 powders with nearly spherical morphology can be obtained from the precursor with Er/Si molar ratio of 20∶12 after being calcined at temperatures at 1300 ℃. Low Er/Si molar ratio can reduce the crystallization temperature of Er2SiO5 and promote the formation of X2-Er2SiO5. The increase of pH value in the reaction system has a certain promotion effect on the formation of ⁅Si—O—Er⁆ structure. During the synthesis process, a ⁅Si—O—Er⁆ network structure is formed in the Er2SiO5 precursor. The ⁅Si—O—Er⁆ network will transform to Er2SiO5 through decomposition and structural reorganization during the calcination process. The Er2O3 impurity is caused by the precipitation of Er3+ of the ⁅Si—O—Er⁆ network structure in the precursor with high Er/Si molar ratio during the crystallization process of Er2SiO5.

  • Research Article
    Liangliang WU, Ruida XU, Zehui JIAO, Huichen YU
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    Liangliang WU, Ruida XU, Zehui JIAO, Huichen YU. High cycle fatigue behavior of selective laser melting TC4 alloy[J]. Journal of Materials Engineering, 2024, 52(3): 61-70.

    An experimental study on high cycle fatigue behavior of selective laser melting (SLM) TC4 alloy was carried out. The fatigue properties of the alloy under two sampling directions (horizontal and vertical) and two temperatures (room temperature and 400 ℃) were compared and analyzed. Also the feasibility of improving the fatigue properties of the alloy by hot isostatic pressing (HIP) was explored. The results show that the fatigue properties of the alloy after annealing are significantly anisotropic, and the fatigue properties of the vertical samples are higher than that of the horizontal ones. Compared with room temperature, the fatigue life of the alloy at 400 ℃ is reduced, but the anisotropy still exists. After hot isostatic pressing, the fatigue life of the alloy presents a certain degree of improvement, and the anisotropy of fatigue properties decreases. The fracture analysis shows that the cracks of SLM TC4 alloy mainly originate from surface and subsurface defects which are mainly pores. The statistical analysis shows that the source defect size of vertical samples is lower than that of horizontal samples, which is the main reason for the decrease of fatigue properties of horizontal samples. After hot isostatic pressing, cracks in both horizontal and vertical samples of the alloy are generated at the surface slip, and the porosity of the alloy is significantly reduced without obvious defects, and the decrease in the number of defects is the main reason for the improvement of fatigue properties of the alloy.

  • Research Article
    Suguo ZHUANG, Boming HE, Xiubo LIU, Feizhi ZHANG, Shiyi ZHANG, Zhiyuan LIU
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    Suguo ZHUANG, Boming HE, Xiubo LIU, Feizhi ZHANG, Shiyi ZHANG, Zhiyuan LIU. Tribologicaland oxidation behaviors of TiN/Co composite coatings on Inconel718 alloy by laser cladding[J]. Journal of Materials Engineering, 2024, 52(3): 71-81.

    In order to study and expand the application of Inconel718 alloy in high temperature environment, Co/TiN composite coating was prepared on its surface by laser cladding. Meanwhile, the tribological behavior of the coatings at room temperature (RT) and 600 ℃, and the oxidation resistance at 800 ℃ were investigated by XRD, SEM and EDS analysis, etc. The results show that the hardness of the composite coatings is 1.3-1.4 times higher than that of the substrate. The tribological properties of the coating are tested. When the TiN content is 4%(mass fraction, the same below), the anti-friction properties of the coating are the best. When 6%TiN added, the wear resistance of the coating is the best, and the wear rate can be reduced by 90.02%. In addition, the oxidation experiment shows that the Co/TiN composite coating has a certain oxidation resistance, and the oxidation rate is 8.7634 mg2·cm-4·h-1, which is not much different from the substrate.It shows that the composite coating can significantly reduce the wear rate at high temperature while retaining the oxidation resistance of the substrate, and the wear rate decreases with the increase of TiN. The wear mechanism analysis shows that the oxidation wear occurs on all coatings at 600 ℃, and the oxide film on the surface of the coatings also can reduces the wear rate at some extent.

  • Research Article
    Yuguang HE, Sijia HAO, Junpeng TIAN, Cheng YANG
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    Yuguang HE, Sijia HAO, Junpeng TIAN, Cheng YANG. Effect of PBAT content on performance of PLA based degradable blend slice and composite meltblown nonwovens[J]. Journal of Materials Engineering, 2024, 52(3): 82-89.

    Taking polylactic acid (PLA) as matrix, poly(butylene adipate-co-terephthalate) (PBAT) as toughening agent and polyethylene glycol (PEG) as plasticizer and compatibilizer, PLA/PBAT/PEG blends with different PBAT contents were prepared by melt-blending method using twin-screw granulator, and the melt index, thermal stability and brittle fracture section morphology of the blended slices were analyzed. The results show that PEG has a good plasticizing and capacitating effect on PLA/PBAT composite matrix, which makes PBAT uniformly dispersed in PLA matrix, showing a typical "island" structure and improving the toughness of PLA matrix. The PLA/PBAT/PEG composite meltblown nonwovens were fabricated by a reciprocating meltblown machine. The effects of PBAT content on the thermal properties, microstructure and mechanical properties of composite meltblown nonwovens were investigated by synchronous thermal analyzer, scanning electron microscopy and electronic universal testing machine. The tensile test results show that proper amount of PBAT and PEG can play a synergistic role in strengthening and toughening PLA-based composite meltblown nonwovens. Compared with pure PLA meltblown nonwovens fabricated by identical process, the PLA-3 (mass fraction of PBAT in PLA/PBAT composite matrix is 3%) meltblown nonwovens displays a 48.8% increment in transverse breaking strength and a 28.7% reinforcement in longitudinal breaking strength, meanwhile the transverse and longitudinal breaking elongation shows an improvement higher than two-fold.

  • Research Article
    Bolun WANG, Tao WANG, Zhongqi HUO, Qiwei SUN, Maoyuan LI, Yun ZHANG, Yuhong CHEN, Yue YAN
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    Bolun WANG, Tao WANG, Zhongqi HUO, Qiwei SUN, Maoyuan LI, Yun ZHANG, Yuhong CHEN, Yue YAN. Finite element simulation on mechanical behavior of press-induced deformation of polycarbonate[J]. Journal of Materials Engineering, 2024, 52(3): 90-99.

    Mechanical behavior of press-induced deformation of polycarbonate at intermediate strain rates was studied by finite element method. Based on DSGZ constitutive model, polycarbonate cylindrical uniaxial compression finite element simulation was carried out. Effectiveness of the model for prediction of compressive mechanical response was verified by contrast of simulated and experimental results, calculation of prediction accuracy of model, and analyzation of multi-physics distribution in material after compressive deformation. Mechanical evolution rule of polycarbonate plates was obtained by simulation of the solid-state deformation in lateral restricted mode. The results show that simulated stress-strain curves is in good agreement with that acquired from experiment in the process of uniaxial compressive deformation, and stress-strain relationship in compressive elastic-plastic deformation can accurately predicted by DSGZ model relatively. The overall deformation of material was uniform, and the sensitivity of stress response to temperature is higher than that of strain rate in cylindrical uniaxial compressive deformation and press-induced deformed simulation. Mechanical behavior of press-induced deformation of polycarbonate was reflected by simulated results, which can be an important basis for engineering realization of press-induced deformation of polycarbonate, and provide strong support for material strengthening and its application in aircraft cockpit transparencies.

  • Research Article
    Fangxia XIE, Dongxing LU, Jiabing HUANG, Wencheng ZHANG, Qichao SUN, Xueming HE
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    Fangxia XIE, Dongxing LU, Jiabing HUANG, Wencheng ZHANG, Qichao SUN, Xueming HE. Effect of ball milling time on corrosion and wear resistance of Ti-13Nb-5Sn dental alloys[J]. Journal of Materials Engineering, 2024, 52(3): 100-108.

    Ti-13Nb-5Sn dental alloy was prepared by powder metallurgy method. The effects of ball milling time (3, 12, 24 h and 48 h) on powder performances, material microstructure, electrochemical corrosion and tribological behavior were investigated. The results show that with the increase of ball milling time from 3 h to 48 h, the powder morphology gradually changes from bulky to fine particles, and a part of Nb and Sn atoms diffuse into Ti lattice to form a certain volume of Ti(Nb) and Ti(NbSn) solid solutions. Moreover, equiaxed α-Ti decreases and shifts into columnar grain boundary α-Ti, and the basket structure changes to Widmandelsteiner structure. The potentiodynamic polarization curves show that the corrosion potential (Ecorr) and polarization resistance (Rp) of the alloy display an upward trend, the corrosion current density (Icorr) reveals a downward trend in artificial saliva (AS) and simulated body fluid (SBF). The corrosion resistance of the alloy is improved because of reduction of α-Ti and increase of β-Ti. The hardness of the alloy increases, while the friction coefficient, wear depth and wear rate gradually decrease. More grain boundaries generate in sintering of the fine powder, resulting in the wear resistance of the alloy intensifying. The Ti-13Nb-5Sn alloy prepared by mechanical alloying combined with molding and sintering shows good corrosion and wear resistances, and has a great potential in the dental field.

  • Research Article
    Shuanghong ZHANG, Jiao LIU, Zijing OU, Lian LIU, Gang KONG, Jiankang ZHU, Shuang LI
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    Shuanghong ZHANG, Jiao LIU, Zijing OU, Lian LIU, Gang KONG, Jiankang ZHU, Shuang LI. Preparation and sensing performance of superhydrophobic reduced graphene oxide/polyurethane composite sponge[J]. Journal of Materials Engineering, 2024, 52(3): 109-116.

    The foaming agent alkyl polyglucoside was added into graphene oxide dispersion to generate graphene oxide microbubble agglomerates, which were then combined with polyurethane sponge skeleton through impregnating, the as-obtained composite sponge was rapidly frozen in liquid nitrogen and reduced by hydrazine vapor to form the reduced graphene oxide/polyurethane composite sponge with special three-dimensional hierarchical porous structure as well as superhydrophobicity and flexible piezoresistive sensing performance. The results show that the reduced graphene oxide/polyurethane composite sponge-based flexible stress-strain sensor has a sensitivity of up to 3.8(gauge factor, GF), a response time as low as 45 ms. In addition, reduced graphene oxide/polyurethane composite sponge has good superhydrophobicity with water contact angle(WCA) up to 152.5°, which has potential application in the complex environment such as wet and underwater.

  • Research Article
    Shuwen LI, Yang ZHANG, Yaxi MA, Pengfei DAI, Zhongwu ZHANG
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    Shuwen LI, Yang ZHANG, Yaxi MA, Pengfei DAI, Zhongwu ZHANG. Effect of Ta content on formation mechanism of passivation film and corrosion resistance in ZrTiNbAl-system alloy[J]. Journal of Materials Engineering, 2024, 52(3): 117-128.

    The formation mechanism of passivation film and corrosion resistance of (40-x)Zr-30Ti-20Nb-10Al-xTa (x=0, 2, 4, atom fraction/%, the same below, referred to as Tax alloy) high entropy alloy in a 0.3mol/L LiOH solution were investigated by potentiodynamic polarization, electrochemical impedance technique, Mott-Schottky analysis and potentiostatic polarization. The results show that the addition of appropriate amount of Ta (2%) helps to form a compact oxide film, which improves the corrosion resistance, while the excessive amount of Ta (4%) decreases the corrosion resistance due to the increase of oxygen vacancy concentration. The corrosion current density of the Ta2 alloy is 49.66 nA/cm2, which is less than the Ta0 and Ta4 alloys of 201.40, 70.16 nA/cm2. The concentration of oxygen vacancy point defect in the passivation film of the Ta2 alloy is 9.79×1018 cm-3, which is less than 2.13×1019, 2.05×1019 cm-3 in the Ta0 and Ta4 alloys, with the most compact passive film structure. The passivation film of the alloy is a stable n-type composed of ZrO2, Nb2O5, TiO2, Al2O3 and Ta2O5. Among them, the oxide content of ZrO2, Nb2O5 and TiO2 in the oxide film of the Ta2 alloy is the highest, which delays the dissolution rate of the primary oxide film and protects the matrix from further dissolution, with the best corrosion resistance.

  • Research Article
    Jingjing NIE, Yue PAN, Xing YUAN, Xianchao XIA, Jingli SUN, Yangxin LI, Tao YING, Lyu XIAO
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    Jingjing NIE, Yue PAN, Xing YUAN, Xianchao XIA, Jingli SUN, Yangxin LI, Tao YING, Lyu XIAO. Effect of heat treatment on microstructure and properties of Mg-12Y-1Al alloy[J]. Journal of Materials Engineering, 2024, 52(3): 129-136.

    The microstructure of Mg-12Y-1Al alloy with solution treatment and aging treatment was studied by optical microscope, X-ray diffraction and scanning electron microscope. The mechanical properties of the alloy before and after heat treatment at room temperature and 200 ℃ were analyzed by tensile test, and the corrosion resistance of the alloy before and after heat treatment was tested by electrochemical methods. The results show that the as-cast microstructure of Mg-12Y-1Al alloy is composed of α-Mg matrix, Mg24Y5 phase and Al2Y phase. Mg-12Y-1Al alloy has excellent high-temperature thermal stability. After solution treatment at 520 ℃ for 16 h(T4), the grain size does not increase, and new long period stacking ordered(LPSO) phase forms; the subsequent aging treatment at 225 ℃ for 30 h(T6) has little effect on the microstructure. Compared with the properties at room temperature, the ultimate tensile strength of T4 alloy at 200 ℃ does not decrease, but the elongation increases from 1.3% to 12.5%. Moreover, the corrosion resistance of Mg-12Y-1Al alloy is improved after solution and aging treatment, and the corrosion current density decreases from 2.799×10-5 A/cm2 to 1.551×10-5 A/cm2.

  • Research Article
    Feiyue LYU, Leilei WANG, Zhiwei DOU, Shengxin LIU, Mingzhen DU, Chuanyun GAO, Xiaohong ZHAN
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    Feiyue LYU, Leilei WANG, Zhiwei DOU, Shengxin LIU, Mingzhen DU, Chuanyun GAO, Xiaohong ZHAN. Normalized evaluation for wire arc additive manufacturing of 2319 aluminum alloy[J]. Journal of Materials Engineering, 2024, 52(3): 137-148.

    To analyze quantitatively various indexes of wire arc additive manufacturing components of 2319 aluminum alloy, the expressions of curved surface between different process parameters, porosity and tensile strength values were fitted, and the "process-structure-property" corresponding rule was established. In addition, a normalized fuzzy evaluation model was developed for process parameters, organizational defects, and mechanical properties using the generalized fuzzy synthesis operation rule. The purpose of this model was to obtain the optimal process parameters. The results show that the porosity generally increases with the wire feeding speed rising.Then the porosity generally decreases with a decrease in scanning speed. When the scanning speed is 0.035 m/s, the correlation between porosity and tensile strength is the lowest, with a correlation coefficient (coefficient of determination, COD) of only 0.6. The comprehensive evaluation score of the expert is the highest when the wire feeding speed is 5.0 m/min and the scanning speed is 0.025 m/s, indicating that this combination of process parameters is optimal.

  • Research Article
    Chenyang WANG, Xiao LIU, Xiaoping LI, Bin ZHU
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    Chenyang WANG, Xiao LIU, Xiaoping LI, Bin ZHU. Heat treatment performance of ER5356 welding wire for MIG welding joint of 7075 aluminum alloy[J]. Journal of Materials Engineering, 2024, 52(3): 149-157.

    MIG welding and ER5356 welding wire were used for butt welding of 7075 aluminum alloy with a thickness of 3 mm. The joint was subjected to T6 heat treatment after welding. The microstructure, mechanical properties and corrosion resistance of the joints were analyzed by optical microscope, X-ray diffraction, scanning electron microscope and energy spectrometer combined with room temperature stretching, microhardness and electrochemical corrosion. The results show that the molten pool flow brings Zn, Cu and other alloying elements in the molten part of the base metal into the weld, and precipitates MgZn2 and AlCuMg phases during the welding process, which become the basis for the heat treatment and strengthening of the weld. After heat treatment, most of the precipitated phase melts into the matrix to form solid solution+aging strengthening, the joint tensile strength increases by 20%, and the weld hardness increases by 18.4%, the corrosion resistance improves. However, due to the limited alloying element content flowing into the weld from the base metal, the difference in mechanical properties between the welding wire and the base metal and the heat-affected zone softening phenomenon cannot be eliminated.

  • Research Article
    Shuo WU, Juan JIA, Xinli SONG, Zhaoyang CHENG, Jun WU, Jing LIU
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    Shuo WU, Juan JIA, Xinli SONG, Zhaoyang CHENG, Jun WU, Jing LIU. Effect of cold rolling reduction rate on deformation microstructure and magnetic properties of high strength non-oriented electrical steel[J]. Journal of Materials Engineering, 2024, 52(3): 158-165.

    The variation rule of deformation structure and magnetic properties of high strength non-oriented electrical steel with cold rolling were studied by field emission scanning electron microscopy(SEM+EBSD), rapid temperature tube furnace and AC magnetic properties measuring instrument. The results show that the rough strips with a large number of substructures and smooth strips with a small amount of deformation are formed in cold-rolled high strength non-oriented electrical steel. The rough strip has a γ orientation, mainly {111}〈110〉, and the smooth strip has a {112}〈110〉 and {001}〈110〉 orientation. In the rough strips, there are a lot of shear bands with width of about 2-3 μm, which show an angle of 20°-35°to the rolling direction. And the quantity increases gradually with the increase of the reduction rate. There is a certain misorientation between the shear band and the matrix. With the increase of the reduction rate, the shear band gradually changes from {111}〈110〉 to {223}〈110〉, and the misorientation between the shear band and the matrix gradually increases. After annealing, the texture of Goss and {111} increases, while the texture of {001} decreases. The rolling direction magnetic induction intensity increases, the transverse magnetic induction intensity decreases, the magnetic anisotropy is significant, and the iron loss decreases.

  • Research Article
    Chengfeng WANG, Xiaoqing DU, Dongchu CHEN, Hongyang WEI, Meifeng WANG
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    Chengfeng WANG, Xiaoqing DU, Dongchu CHEN, Hongyang WEI, Meifeng WANG. Corrosion resistance of Mg-Al LDHs film on magnesium alloy surface by chelating agent-assisted method[J]. Journal of Materials Engineering, 2024, 52(3): 166-175.

    In order to reduce the energy consumption of the reaction, the magnesium alloy samples were immersed directly into three conversion solutions and reacted for 9 hours at 60 ℃ and pH=12.0 used the chelating agent-assisted method by adding three chelating agents, ethylenediaminetetraacetic acid tetrasodium (EDTA-4Na), sodium citrate (SC) and potassium sodium tartrate (PST) to aluminum nitrate (Al(NO3)3) solution, and Mg-Al layered double hydroxides (LDHs) films doped with different chelating agents can be prepared on the surface of magnesium alloys. The microstructure, phase composition, and corrosion resistance of each LDHs film were analyzed by SEM, XRD, FT-IR, etc. The results show that the chelating agent-assisted method can successfully prepare LDHs films with typical layered structure on the surface of magnesium alloys under normal pressure and 60 ℃ environment; and three kinds of Mg-Al LDHs films obtained can effectively improve the corrosion resistance of magnesium alloys. Then, by comparing the structural properties of three different LDHs film layers, it is found that the Mg-Al-PST LDHs film prepared by adding PST has the highest density and the largest thickness, reaching up to 1.4 μm. The improvement effect of three coatings on the corrosion resistance of magnesium alloys is as follows: Mg-Al-PST LDHs > Mg-Al-SC LDHs > Mg-Al-EDTA LDHs; The magnesium alloy covered with the Mg-Al-PST LDHs film compared to the blank magnesium alloy, the corrosion current density decreases by about two orders of magnitude, and the total corrosion resistance increases by about one order of magnitude. And based on the analysis of the structure and properties of the obtained LDHs films, it can be seen that the chelating agent-assisted method can prepare Mg-Al LDHs films with better corrosion resistance in-situ on the surface of magnesium alloys under the lower energy consumption condition. The reason may be that the carboxyl group in the chelating agent can accelerate the deposition of Al3+ on the magnesium substrate and promote the substitution of some Mg2+ in Mg (OH)2 by Al3+ to form LDHs.

  • Research Article
    Zhiqiang CHEN, Yuhong LUO, Jinghua LIANG, Mengran LIU, Qing WANG, Xiaotian DONG
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    Zhiqiang CHEN, Yuhong LUO, Jinghua LIANG, Mengran LIU, Qing WANG, Xiaotian DONG. Impulse mechanical strength improvement of alumina by surface coating[J]. Journal of Materials Engineering, 2024, 52(3): 176-181.

    To increase the impulse mechanical strength of alumina, the pore structure of alumina was modified by surface coating. It was found that the impulse mechanical strength of alumina samples coated with aluminum chloride increases from 35 MPa to 51 MPa and the mechanical strength of alumina samples coated with aluminum-based complex increases from 21 MPa to 46 MPa at the calcination temperature range of 100 ℃ to 1100 ℃ by the DL-3 typed impulse mechanical strength test device, while the mechanical strength of uncoated alumina samples increases from 17 MPa to 39 MPa. According to scanning electron microscopy and X-ray diffraction, the surface coating of aluminum chloride has little influence on the crystal type of alumina materials after high temperature calcination. At the same time, it can effectively fill the matrix pore of alumina materials, increase the density of the support, and improve the mechanical strength of alumina materials. In addition, compared with the alumina sample coated with aluminum complex, the alumina material coated with aluminum chloride possesses larger surface area and smaller pore size after high temperature calcination. More importantly, the surface of the alumina sample coated with aluminum chloride formed a rough shape after high temperature calcination, which was beneficial to the loading and dispersion of the active metals.

  • Research Article
    Yanfen LIU, Shuang LI, Zirui LANG, Zixuan MA, Xiaohua LIU
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    Yanfen LIU, Shuang LI, Zirui LANG, Zixuan MA, Xiaohua LIU. Influence of Fe on shape memory effect of Ni-Mn-Ga alloy microwire[J]. Journal of Materials Engineering, 2024, 52(3): 182-191.

    The shape memory effect of alloy microwire with Fe replacing Ga based on Ni-Mn-Ga alloy microwire was analyzed. Ni-Mn-Ga-Fe alloy was prepared by vacuum tungsten arc melting furnace and the parent alloy was prepared by a high vacuum precision melt drawing equipment. The effects of Fe doping on the phase, the martensite transition behavior, and shape memory effect were studied by EDS, DSC, XRD and DMA. The results show that the Ni-Mn-Ga-Fe alloy microwire shows the mixed phase of tetragonal martensite phase and face-centered cubic austenitic phase. The step ordering heat treatment was used for the microwire. The microwire was treated by step-by-step step ordering heat treatment, the ordered heat treatment can effectively reduce the internal defects of the microwires, release the internal stress, refine the internal grains of the microwire, shrink the lattice volume, improve the compactness of the microwire, and make the martensite twin interface more straight and easier to move, and improve the elongation of the microwire.The one-way shape memory test of the prepared Ni-Mn-Ga-Fe alloy microwires is carried out at 258 K, after stretching to 350 MPa and unloading to 0 MPa. The strain recovery rate is 78.75% after the microwires are heated to the austenite state. The one-way shape memory test of the ordered heat-treated Ni-Mn-Ga-Fe alloy microwires is carried out at 289 K, and the strain recovery rate reaches 100%. The ordered heat-treated ternary Ni-Mn-Ga alloy microwire and Ni-Mn-Ga-Fe alloy microwire are stretched under constant stress at 126 MPa and 240 MPa, respectively. The two-way shape recovery ability of the two microwires can reach almost 100%, but the phase transition width of the alloy microwire during deformation, namely the elastic strain energy storage is more than that of the ternary alloy microwire. The addition of Fe makes the mechanical properties of the alloy microwires higher than that of the traditional ternary shape memory alloy microwire; compared with Ni-Mn-Ga alloy microwires, the martensitic transformation temperatures of Ni-Mn-Ga-Fe alloy microwires in as-prepared and heat-treated states increase by 6.0 K and 11.5 K respectively, and the thermal hysteresis decreases by 6.7 K and 1.5 K respectively. In practical applications, Ni-Mn-Ga-Fe shape memory alloy may be more widely used due to its small thermal hysteresis, high martensitic transformation temperature and large strain recovery rate.

  • Research Article
    Shijian YAN, Jin GUO, Yang TONG, Nobuyuki IMANISHI
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    Shijian YAN, Jin GUO, Yang TONG, Nobuyuki IMANISHI. Feasibility study of carbon cloth for 3D integrated flexible cathode of lithium-ion battery[J]. Journal of Materials Engineering, 2024, 52(3): 192-198.

    The carbon cloths made of carbon fiber as 3D integrated cathode for lithium-ion batterie were studied. The graphitization degree of three types of carbon cloths after heat treatment were qualitatively analyzed and quantitatively calculated. Using lithium metal as the counter electrode, the graphitized carbon cloth electrodes show first discharge specific capacities of 83.6, 94.5 mAh∙g-1 and 115.2 mAh∙g-1 under 0.1-0.5 V, respectively. After 50 cycles, the specific capacities of carbon cloth electrodes remain 55.0, 80.0 mAh∙g-1 and 88.0 mAh∙g-1.With LiFePO4-loaded graphitized carbon cloths as cathodes, the initial discharge specific capacities of electrodes are 73.2, 109.5 mAh∙g-1 and 130.2 mAh∙g-1, respectively. The carbon cloth whose graphitization degree is 76.02% shows stable specific capacity of about 90.0 mAh∙g-1 after 50 cycles, and shows better comprehensive performances. This carbon cloth is more suitable for the integrated flexible cathode of lithium-ion batteries. By establishing the mechanical model of the interaction between LiFePO4 particles and carbon fiber, the relationship between mechanical, electrical and electrochemical properties of the integrated cathode were discussed.Using carbon cloth as an integrated cathode for lithium-ion batteries can simplify the conventional production process and innovate its production process.

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