Wei Pengyi, Zhong Zhengang, Gui Zhonglou, Liu Rongmin, Lao Riling, Li Jiarong. Effects of Composition on High Temperature Rupture and Fracture Feature of Re-containing Ni-based Single Crystal Superalloys[J]. Journal of Materials Engineering, 1999, 0(4): 3-6,46.
A new secondary generation Nibased single crystal superalloy containing only 2wt%Re was developed. Effects of main alloying elements, W, Re, Ta, Al, RE, on high temperatures(980~1100℃)rupture properties and fracture surface characteristics of Re-containing Ni-based single crystal superalloys were investigated to explore the principle for improving alloying and understand the fracture behavior in this series of alloy. It is found that: increasing the contents of Re, W, Nb, Ta, Al, RE, to certain extent will contribute to improvement of high temperature rupture properties, and then it is turned out to be reasonable to decrease the necessary Re. contents by matching of contents of elements other than Re, especially minor addition of RE Those results are due to individual and mutual effect on strengthening and volume fraction of alloy phases(γ′,γ) and coarsening dynamics of γ′phase during creep process.
Su Zhengtao, Liu Jun, Kong Yi, Zhang Zheng, Yin Yanling. Study on the Thermal Stability of Phenyl Silicone Rubber[J]. Journal of Materials Engineering, 1999, 0(4): 7-8,12.
The thermal stability of phenyl silicone rubber with various metal oxides as stabilizer has been investigated by heat aging in air at 250℃×72h, 300℃×50h and 300℃×96h. The results show that complex of ferric oxide and stannic oxide improves the thermal stability of phenyl silicone rubber and increases thermal degradation temperature from 380℃ to 450℃.
Chen MengchengWu FengyunShen WenyenGao YangLi Jianpin. Study of Ceramic Thermal Barrier Coating and Thermal Cycling Test[J]. Journal of Materials Engineering, 1999, 0(4): 9-12.
In this paper, the thermal cycling test has been performed on the TBC coatings which made of Y2O3 stabilized ZrO2 by electron beam physical vapour deposition (EB-PVD). The samples are subjected to thermal cycling test under the high temperature. The results reveal the morphology and phase transformation by means of SEM and XRD.
Yan Hai, Chen Ying, Ding Chuanfu, Tao Chunhu. Study on Micro-Mechanism of Short Crack Propagation of LY12 Aluminium Alloy[J]. Journal of Materials Engineering, 1999, 0(4): 13-15.
The micro-mechanism of short crack and the influence of micro-structures on short crack propagation have been investigated by OM, SEM and TEM for a LY12CZ Aluminium alloy.
Huo Xiao, Zhang Jiansu, Wang Beilei, Wu Fengyun, Han Yafang. Investigation of Black Spots Presented on NiCrAlYSi Coating During an Engine Test[J]. Journal of Materials Engineering, 1999, 0(4): 16-19.
The turbine vanes of a recently developed aero-engine were cast using a Ni3Al based casting alloy IC6 and then overlaid with NiCrAlYSi coating by vacuum arc deposition and DC magnetron sputter processes. After a 379-hour-long engine test, some black spots with variant sizes occurred on the coating surface at the concave and convex parts of these vanes. In this paper, the origin and effect of black spots on the coating and the base alloy were investigated by SEM, XRD, EPMA and EDS techniques in order to evaluate the applicability of this coating to IC6 alloy and the condition of the engine test as a whole.
Xing Zhanping, Han Yafang, Yan Minggao. Microstructure of the NiAl-Based Alloy by γ′Ductile Phase Reinforcement[J]. Journal of Materials Engineering, 1999, 0(4): 20-22,35.
NiAl-based two-phase (γ+γ′) alloy Ni-31Al was prepared by a directionally solidified method. It was found that the microstructure of the alloy was a braided fiber reinforced NiAl matrix in situ composite. There is one orientation relationship between γ and γ′ phases in the as-cast state. Homogenization at 1280℃/6h followed by air cooling or oil quenching resulted in the γ-NiAl phases in the two alloys mostly transformed to NiAl martensites. In the meantime, volume percent of the γ′-Ni3Al phases decreased with increased cooling rate.
Zhang Jun, Peng Jing, Li Huiquan, Jian Xigao. The New Progress in TLCP/TP In Situ Composite[J]. Journal of Materials Engineering, 1999, 0(4): 23-27,42.
In this paper, the recent progress in situ composite based on thermotropic liquid crystalline polymer/thermoplastic polymer blend is reviewed.Rheology, morphology, mechanical property and compatibility of in situ composite is discussed.Finally, the advantage and prospect of in situ composite is described.
Zhou Shaorong, Qiao Shengru, Bai Shihong. On Testing and Evaluation of Fracture Toughness for C/C Composites at Room and High Temperatures[J]. Journal of Materials Engineering, 1999, 0(4): 28-31,19.
Many effects on the fracture toughness for C/C composites, as well as evaluation methods of fracture toughness are summarized in this paper, in order to establish test methods for fracture toughess of C/C composites at room and high temperatures.
Chen Mingan, Zhuo Li, Zhang Xinming. Preparation of Rapidly Solidified Al-12.6%Si Alloy Strips by Double-roller Method[J]. Journal of Materials Engineering, 1999, 0(4): 32-35.
Al-126%Si strips with 0.1 to 0.5mm thickness have been produced directly from the melt by double-roller rapid solidification process.The mechanism and characteristics of this method and key points related to design of the experimental apparatus have been described.The roll surface velocity Vr ranged from 2 to 8.5m/s. It was shown that the strips thickness was proportional to Vr-1/2 and that the microstuctures of the strips were composed of fine primary α-Al phase and very fine eutectic grains of α-Al and Si.Tensile strength and plasticity of the strips were greatly improved.
Liu xiang, Ding Heyan. Study and Application of Phosphating Primer in the Repairing of Military Aircraft Skin Coatings[J]. Journal of Materials Engineering, 1999, 0(4): 36-38.
A modified phosphating primer has been studied to be intended to repair military aircraft old skin coating, and compared with similar foreign product. The results show that the comprehensive properties of the aircraft skin coating containing this kind of primer reach the levels of similar foreign products in technology.
Liang Jizhao. Effects of Glass Bead Content and Diameter on the Dynamic Mechanical Properties of Filled Polypropylene Composites[J]. Journal of Materials Engineering, 1999, 0(4): 39-42.
The effects of the filler content and diameter on the dynamic mechanical properties of glass bead filled polypropylene (PP) composites have been investigated in a temperature range from -150 to 100℃, by using a dynamic mechanical analyzer.The results show that the storage and loss moduli at room temperature increase non-linearly with increasing the volume fraction of glass beads, φf, at the same conditions the dynamic moduli of the PP filled with big glass beads are higher than those of smaller glass bead filled systems;influence of glass bead content and diameter on the mechanical damping of the composite is insignificant;at BX φf=5%~15% glass transition temperature increases with increase in φf, then decreases;dynamic complex viscosity linearly increases with increasing φf.
Yang Bo, Zhang Erlin, Zeng Songyan, An Geying, Ma Mingzhen. Study on Microstructure of TiC/Al2O3 Composite Ceramics Fabricated by SHS/QC[J]. Journal of Materials Engineering, 1999, 0(4): 43-46.
TiC/Al2O3 composite ceramics were fabricated by SHS/QC (quick consolidation) in this paper.The phase and microstructure characteristics of TiC/Al2O3 composite ceramics made under various conditions of preheating temperature and diluent were investigated.The results show that as preheating temperature is raised, the combustion is transferred from unstable spiral model to stable planar model, materials are easy to be formed, and reaction is more complete but the microstructure of reaction product was gross.On the contrary, the particles of TiC and Al2O3 produced by reaction were fine, but cracks are easy to appear in the forming process of consolidation.The combustion characteristic parameters of this system were measured by experiments and the reaction mechanisms were also discussed in the paper.
Zuo Hongbo, Guo Yingkui, Li Mingfei. TEM Analysis of Al2O3ZrO2WC Ceramic Composites[J]. Journal of Materials Engineering, 1999, 0(4): 47-49.
Al2O3-ZrO2-WC ceramic composite was prepared by using hotpress sintering. Microstructure of the composite was analyzed by means of TEM. And the toughening mechanism of the composite was researched.
