Huang Junsheng, Zhang Xinming, Zuo Tieyong. Effect of Zr on the Microstructure and Mechanical Properties of Rapidly Solidified Aluminum-Lithium Alloys[J]. Journal of Materials Engineering, 1996, 0(3): 3-5.
Four kinds of rapidly solidified aluminum lithium alloys with different composition were made using a multi grade rapid solidification equipment.The existance form and the effect of zirconium on the microstructure and properties were investigated.
Xiao Chengbo, Han Yafang, Yin Keqin, Zhao Xihong. High Temperature Creep Behaviour of a Directionally Solidified Ni3Al Base Alloy IC6[J]. Journal of Materials Engineering, 1996, 0(3): 6-8,32.
The creep curves,stress exponent and activation energy of creep of a DS casting Ni3Al base alloy IC6 in the temperature range of 950~1100℃ have been calculated in this paper.The microstructure change during creep has been examined with SEM and TEM techniques,the forming mechanism of γ raft structure during creep has been discussed.It has been found that the γ raft structure inhibits dislocation movement effectively.
Hua Wenjun, Wang Zhirui, Zhang Jirong. The Propagation Behavior of Short and Long Fatigue Crack in TiB2 Particulate Reinforced Zn （ZA-8） Alloy[J]. Journal of Materials Engineering, 1996, 0(3): 9-13,28.
The propagation behavior of short and long fatigue cracks emanating from notches in specimens of a TiB2 particulate reinforced ZA-8 Zn metal matrix composite(MMC) and the corresponding constituent matrix material was studied.By using well-polished specimens and monitoring the development of fatigue crack path,the growth rate of short and long fatigue cracks was measured through a load-reducing program.The interaction between particles and crack tip was observed along the crack path as well.Results of this study revealed the arresting phenomenon of short cracks in the MMC specimens as well as in the constituent matrix material. This arresting behavior is attributed to the notch plasticity in both materials,and also to the interaction between particles and crack in the MMC,It was also found that short and long fatigue cracks in the two materials demonstrated clearly the different growth rates at same △K levels,resulting from different closure effects as the crack length increased.However,through subtracting out the effect of closure behavior so as to demonstrate the characteristics of crack growth rate in terms of △Keff,the difference in crack growth rate between short and long cracks has become minimal.
Cui Guangzhi, Xu Zhenzong. Method of Preparing Titanium Alloy Investment Casting Binder──Diacetatozirconic Acid[J]. Journal of Materials Engineering, 1996, 0(3): 14-16.
In this paper,the physical and chemical properties of diacetatozirconic acid binder,have been presented briefly.A useful synthtic method for binder has been set up united with investment casting characteristic.
Tang Cairong, Li Miaoquan, Li Zelin, Chen Dunjun, Chen Yanyun. Superplasticity of Al Composite Fabricated by Spray Deposition Processing[J]. Journal of Materials Engineering, 1996, 0(3): 17-19.
In this paper,10vol%SiCp/LY12 Al composite was fabricated by spray deposition processing and its superplasticity has been investigated.The experimental results show that this Al composite has good superplasticity with the pretreatment of the hot isostatic pressing and isostatic hot extrusion,the optimum parameters during superplastic deformation are respectively 480℃ of the deformation temperature and 1.0×10-3 s-1 of the initial strain rate,the maximum value of strain-rate exponent and limit elongation are respectively 0.53 and 345%.
Wang Yuan, Jiang Congdian. The Study of Resin Systems for RTM Processes Moulding the Three Dimention Composite[J]. Journal of Materials Engineering, 1996, 0(3): 20-22.
On the basis of the characteristic of the three dimention fabric,the paper investigates resin systems of the RTM processes,which mould the three dimention composite.The characteristic of resin systems are low viscosity and long applicable term.The resin systems can meet the technical requirements of RTM processes that mould the three dimention composite of high fiber volume content.
Zou Xianwu, Lai Shihong, Kong Weizhong, Yang Fengqin. The Development and Application of SY-P1A Foam Adhesive[J]. Journal of Materials Engineering, 1996, 0(3): 23-25.
This paper mainly introduced the development,properties and application in aircraft industry of SY-P1A foam adhesive.
Yin Weiying, Yang Xizhen, Zhang Heming, Li Fengting, Zhou Baowen. The Study on the Temperature-Resistant and Corrosion-Resistant Properties of Polyketone Sulfide（PKS）[J]. Journal of Materials Engineering, 1996, 0(3): 26-28.
The study of the synthesis method and some properties of Polyketone Sulfide(PKS)were made mainly in this work.PKS which has the struture as was synthesized by 4.4'-dichloro-benzophenone and sodium sulfide.DSC and TG showed that the values of melting point and enthalpy of fusation of PKS were 338.41℃ and 32.80 J/g respectively.It started to decompose at 456℃ and lost half weight at 650℃.Chemical immersion indicated that PKS has better corrosion-resistant properties.
Zhu Changlin. The Properties of Lubricating-Oil in Use for Aviation Gyroscopes[J]. Journal of Materials Engineering, 1996, 0(3): 29-32.
The Lubricating-oil in use for gyroscopes is one of lubricant materials on airplane. Its properties including evaporation, visco-temperature, friction moment and lubricity, are studied in this paper. The working and long-time in use capacity of various oil is evaluated.
Wang Xinggui, Xia Liming, Cong Xin, Lu Hong, Li Yizeng. Study on the Carburized Microstructure Followed by Austempering in Cr12MoV Steel[J]. Journal of Materials Engineering, 1996, 0(3): 33-35.
The favourable mechanical performances and applicational effect have been achieved, when the process of carburizing followed by austempering is carried out in Cr12MoV steel. This paper deals with the microstructure of inside and outside layer after treating as above process, in Cr12MoV steel. The results are as follows:the Bainite in inside structure is typical; the particular dark needle structure has been found in carburized layer after long time austempering. This analyse and results can be regarded as the theoretical basis in this new process field,i.e. carburizing followed by austempering, which increases the strength and toughness of Cr12MoV steel.
Ma Deliang, Ye Zhizhen, WU Yun. A Study on the Adhering of Palladium and Platinum Alloy Wire Annealed in the Quartz Tube[J]. Journal of Materials Engineering, 1996, 0(3): 38-40.
As the palladium and platinum alloy wire passing through the quartz tube for continuous annealing, the wire often adheres to the wall of tube and breaks,This paper analysed the mechanism of such phenomenon. Now the quartz tube is replaced by the alumina oxide tube for annealing the wire, so thoroughly solved this problem.
Zhang Jixiang, Tang Rongsen. Designs for an Experimental Method of the High Temperature Superplasticity[J]. Journal of Materials Engineering, 1996, 0(3): 41-43.
An experimental method of the high temperature superplasticity which has not standardized up to now is very unfavourable to develop new-type materials and to formulate a processing technology, There is presented that the method has been designed to overcome this insufficient and a good results is yielded in practice.
Huang Fuxiang. The Early Fracture Failure Analysis of Cold-rolling Roller[J]. Journal of Materials Engineering, 1996, 0(3): 44-46.
This paper analyzes the reason of early fracture of GCr15 cold-rolling roller by EPMA and Optical metallography. The result show that fracture origins are not on the surface of macrofracture, but at the roller's neck keyway roots that there stress is concentrated. Sulfide inclusions being dispersed along the direction of roller axis are coalesced at the roller's neck keyway roots and lead to fracture in working process. Inhomogeneous microstructure of roller's neck accelecates the fracture propagation.
Wang Jianping. Research Advances of Nd-Fe-B Rare Earth Permanent Magnet Materials[J]. Journal of Materials Engineering, 1996, 0(3): 47-49.
A brief review of production processes of Nd-Fe-B rare earth permanent magnet materials is introduced. It is summerized that the magnetic properties were improved and the cost of producing is reduced, and the prospect for further development is pointed out.
