Wang Shenqiang, Chen Zhiqiang, Peng Delin, An Geying. A Comprehnve Survey of High Conductivity, High Strength Coppet Based Alloys[J]. Journal of Materials Engineering, 1995, 0(7): 3-6.
High conductivity, high strength coppor based alloys are a series of promsing ftinctional materials.In recent years,remarhable achievement has been taken in the study, development and application of high conductivity,high strength copper based alloys.In this poper,the basic principles and fabricating processings of high conductivity,high strength copper based alloys were described.A summary of the stndy and application of high conductivity,high strength copper based alloys was given.Besides,the future of development and application of high conductivity,high strength copper based alloys was also presented.
Han Bingiang. Progress of Research on Suporplasticity of Y-TZP Ceramic[J]. Journal of Materials Engineering, 1995, 0(7): 7-10.
Fined-grain Y-TZP ceramics have been found to exhibit superplasticity in recent years and this discovery has attracted much interest.In China it has been found that Y-TZP can be elongated to failure of more than 240% at 1723K Superplasticity of Y-TZP has been studied extensively in Japan and U.S.Although the experimental observations of large deformation of Y-TZP are in some ways similar to those reported in numerous metallic alloys,some impomnt differences are also necessity consider the grain size,relationship between the steadystate flow stress and the imposed rain rate, and the change f stress exponent.
Ma Wenli, Li Xiaohong. External Development of Powdered Metal Parts Brazing and Dif fusion Bonding[J]. Journal of Materials Engineering, 1995, 0(7): 11-13.
Ihe recent external developments in study of powdered metal parts brazing and diffusion bonding are summarized in this pacer.
Han Guangwei, Feng Di, Ye Wujun. Hardening Effect of Fine Dispersion of Disordered γin a Recrystallized Ni3 Al Based Alloy[J]. Journal of Materials Engineering, 1995, 0(7): 16-19.
A Ni3Al based alloy hardened by fine dispersion of disordered γ has been obtained by controlling composion and treating preeess.Investigution by TEM shows that the fine dispersion of γ preeiptates from {001} Plane of γ’matrix and is perfectly coherent with it.Tensile experiments at various temperatures shows that the peak temperature of yield strength of the Ni3Al based alloy is increased up to about 850℃,and its yield strength and tensile strength at high temperatures as well as strain bardening rate below thepeak temperature are markedly increased comporing with IC-218 alloy, which is because of the hardeningeffect of the fine dispersion,The fracture surfaces of tensile spoimens are analysed hy SEM and the hardening mechanism of fine dispersion of γ is investigated.
Gu Hui, Dang Xuning, Zhang Zhiqian. Effect of Bismaleimide Systems on the ILSS of T-50/Phenolic Expoxy Composite[J]. Journal of Materials Engineering, 1995, 0(7): 20-22.
In this paper,effect of phenolic expoxy matrix modified by bismaleimide Systems and the cured processing technique on the composites interlaminar shear strength (ILSS) have been studied.Shear sections ofthe composites have been analysed by SEM method.The results indicate that when modified bismaleimide put in the phenolic expoxy matrix,ILSS of the composites is increaed by 10%.
Tang Xin, Liu Faxin, Yang Aide, Yuan Wenming. Investigation of K417 Fine Grain Casting Thermal Parameters[J]. Journal of Materials Engineering, 1995, 0(7): 23-25.
Ihe thermal process parameters of K417 fine grain casting have been investigated in this paper. The yesults show that the sound fine grain castings of K417 can been obtained，while the pouring temperature is controlled within P +29℃~P+50℃，and the mold temperature is controlled within 900-1000℃.The main advantage of the fine grain castings over conventional castings is that the low-cycle fatigue life
is increased by a factor of 3~4.
Qian Donghang, Li Jun, Qjan Hancheng, Peng Xiaodong. Effect on Microstructure and Properties of the Hypoeutectic Al-Si Alloy by a Combined Modifier[J]. Journal of Materials Engineering, 1995, 0(7): 26-30,19.
Through modification on tne hypoeutectic Al-Si alloy by a type of combined modifier,α-Algrains beame much fine, well-distributed and the branches was incrcaed.After holding for four hours orremelting five times at the melted temperature,the alloy can still keep the sarne modificated effect.Themodificated microstucture is beneficial is teneficial to the granulahng of the eutectic silicon during heat treatment.As aresult,the comprehensive mechanical properties improved greatly.
Ling Bin, Zhong Bingwen, Zhao Zhenye, Zhang Shapoing. Study on the Microstructure after Continuous Cooling Transformation and Ageing Reaction in Ultra High strength Steels[J]. Journal of Materials Engineering, 1995, 0(7): 31-32,10.
The microstructures in an ultra high strength steel after continuous ccoling and low temperature isothermal transformations were researched.The results show that there is an ageing stage in martensite and bainite during continuous cooling or low temperature isothermal transformation.Its structural feanire istweed papettern.The orientation relationship between the transition carbide and matrixboes not conform to the well-established Jack orientation relationship,but a now one.Transition carbides may emay emerge directlyfrom the the rweed structure.
Tian Guoli. Effects of Cristobalite Content of Silica Base Ceramics Core on the Rate of Qualified Pouring[J]. Journal of Materials Engineering, 1995, 0(7): 33-35.
In this article,the relationship tetween strength and cristohalite contents,cristobalite contents and the rate of qualified pouring in the silica base ceramics core is analysed with the emphasis on discussing the con-trolling of cristobalite content to provide reliable basis for increasing the rate of qualified of turbine blades.
Zhang Lifang, Li Wenming, Liu Jinling, Ren Baolin. Process and performance of Electroless Cu/Ni-P Doube Films[J]. Journal of Materials Engineering, 1995, 0(7): 38-41,45.
The paper discussed process for obtaining good Cu/Ni-P double films on surface of ABS plastic by alkaline electroless plating liquid Structure of the film was studied by X ray diffraction,XPS and SEM.The adhesive force,conductivity and electromagnetic shielding effectiveness of films were investiguted.
Ma Shuwei, Ruan Zhongci, Zheng Yunrong. A Simple Calculating Method of Crystallinity of APC-2 by X-ray Diffraction[J]. Journal of Materials Engineering, 1995, 0(7): 42-43,49.
X-ray diffraction patterns of the aromatic polymer composite APC-2 have been analysis in this.paper.From the experimental data analyzed with linear analyztion method,there is a rcasonable linear relationship between crystallinity of APC-2 and the hc/ha ratio.That is Xc=103.8hc/ha +2.98.So a simple calculating method of crystallinity is required.Using this method,we studied the relationship of crystallinity and heat treatment.
Xi Niansheng, Yan Hai. Surface Crack Analysis of Z9 Landing Gear's Inner Cylinder[J]. Journal of Materials Engineering, 1995, 0(7): 44-45,48.
In this paper the nature and forming of the surface crack of Z 9 landing gear's inner cylinder have been analyzed.The cause of damagr of the cylinder was determined on the basis of the inves tigation of manufac turing proce dures and charac teristics of the crack.Some recommendstion are also put for word for the forging process of inner cylinder.
Feng Weixi. The Progress of Technical Management on Aeronautical Material standardization[J]. Journal of Materials Engineering, 1995, 0(7): 46-48.
The main achievensents and exporiences on technical managenment of Aeronatical material standard-ization Management Centre were introduced in this paper.Certain problems on development in future were also discussed.
