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INTERFACIAL STRUCTURE AND PHASE REACTION IN SiC/NiCr ALLOY JOINT

J. C. Feng , M. Naka , J. C. Schuster(School of Materials Science and Engineering , Harbin Institute of Technology , Harbin , 150001 , China , Joining and Welding Research Institute , Osaka University , Mihogaoka 11 - 1 , Ibaraki , Osaka 567 , Japan , Institute of Physical Chemistry , University of Vienna , Austria )

金属学报(英文版)

Bonding of SiC to SiC using Ni and Ni - 25at%Cr foils was performed at high temperature.Interface structures and reaction phases were investigated by EPMA analyses and XRD diffraction method, re- spectively. At a bonding temperature of 1273K Ni reacts with SiC and forms various Ni silicides con- taining graphite baside SiC. Ni3Si without graphite was formed at Ni side.The interface structure of SiC/Ni joint was SiC/Ni2Si + C/Ni31 Si12 + G/Ni3 Si/Ni. At the interface between SiC and Ni- 25at%Cr alloy the Ni silicide was only Ni2Si at the same bonding temperature,and further(Cr, Ni)7 (Si, C)3 carbide was formed between Ni silicide + graphite zone and Ni - 25at%Cr alloy.The interface structure of SiC/Ni - 25at%Cr alloy was SiC/Ni2Si + C/(Cr, Ni)7 (Si, C)3+Ni(ss. Cr, Si)/Ni - 25at%Cr.

关键词: interfacial structure , null , null , null

Investigation on Initial Stage of Electroless Deposition on Low Carbon Steel and Pure Iron

Yiyong WU , Yongqian WANG , Yongzhong ZHANG and Mei YAO (School of Materials Science and Technology , Harbin Institute of Technology , Harbin , 150001 , China)Xinguo HU(Applied Chemical Department , Harbin Institute of Technology , Harbin , 150001 , China)

材料科学技术（英）

Initial process is influenced by substrate microstructure according to the study of initial stage of electroless plating on low carbon steel and pure iron. For low carbon steels, depositing on cementite is prior to that on ferrite, and for pure iron, the grain boundaries and some favourable grains are deposited more easily. The initial reactions of electroless depositing of Ni-P alloy have been tentatively proposed

关键词:

Comparison of K_(IC) Values for SiC Whisker Reinforced Ceramic Composites Obtained by Using Various Methods

Tingquan LEI , Guangyong LIN , Shuangxi WANG , and Yu ZHOU (Dept. of Metals and Technology , Harbin Institute of Technology , Harbin , 150001 , China)(To whom correspondence should be addressed)

材料科学技术（英）

The fracture toughness (KIC) values determined by indentation microfracture method (IM ) for SiC whisker reinforced Al2O3 and ZrO2 based composites were calculated with different IM equations and compared with those obtained by singte edge notched beam (SENB) technique. Experimental results show that the KIC (IM) values calculated with different equations are quite different one from another. For composites without phase transformable components the KIC (IM) and KIC (SENB) values are practically on the same level, but for composites with phase transformable components (partially stabilized zirconia) the KIC (SENB) values are always higher than KIC (IM). This is because that the IM method can not reveal sensitively the toughening effect due to dynamic t-m transformation of ZrO2 as the SENB method does. The accuracy of the IM method depends on the Suitability of the IM equations and was evaluated for the materials used in this investigation. Two new IM equations are suggested with which the KIC (IM ) values can be obtained very close to KIC (SENB) values for composites having phase transformable components.

关键词:

Mobility of Various Intervariant Interfaces in 18R Martensitein a Cu-Zn-Al AlloyPart Ⅱ: Some Theoretical Considerations

Jianxin ZHANG , Yufeng ZHENG , Wei CAI and Liancheng ZHAO (School of Materials Science and Engineering , Harbin Institute of Technology Harbin , 150001 , China)

材料科学技术（英）

Detailed crystallographic analysis has been undertaken on the various combinations Of 24 martensite variants in the 18R martensite of a Cu-Zn-Al shape memory alloy. Based upon the calculated crystallographic data, the interface energy of different twin interfaces was calculated using a lowangle-grain-interface model. For the variant/variant pairs in a self-accommodating group. the A/C type and A/B type interfaces have low interface energy, and A/D type interface is an intermediate one. In contrast, the intervariant interfaces that belong to different plate groups have high intrface energy. The calculated results are consiStent with the previous observations of the mobility of intervariant interfaces.

关键词:

Microstructure and Mechanical Properties of Al-4.9Ni-4.9Ti Alloy Prepared by Mechanical Alloying

Guoxian LIANG , Zhichao LI and Erde WANG (College of Materials Science and Engineering , Harbin Institute of Technology , Harbin , 150001 , China)

材料科学技术（英）

Mechanically alloyed Al-4.9Ni-4.9Ti powders were prepared by milling mixed aluminium, titanium and nickel powders, and then consolidated by hot hydrostatic extrusion. The microstructures of milled powders and extruded bars were characterized by X-ray diffraction and transmission eIectron microscopy observation. The results show that mechanical alloying and consolidating processes have great effects on the microstructures and mechanical properties of extruded materials. Polycrystalline materials having an ultrafine grain size may be prepared by mechanical alloying. The strength and thermal stability are improved with the increasing of processing time of mechanical alloying, since grain size decreases and volume fraction of dispersoids increases as milling time increased

关键词:

Development of Fundamental Research of SiC_w / Al Composites in HIT Part Ⅱ: Mechanical Behaviour of Squeeze-cast SiC_w / Al Composites

Jun LIU , Dezun WANG and Congkai YAO(Dept. of Metals and Technology , Harbin Institute of Technology , Harbin , 150001 , China)

材料科学技术（英）

Studies on the mechanical behaviour of squeeze-cast SiCw / Al composites have been revjewed. The results show that SiCw / Al composites exhibit improved mechan ical properties and cyclic hard ening. The reasons leading to the above results are discussed. Localized deformation near SiC whiskers plays an important role in the initiation of microcracks in the composites, and the fracture of the composites is caused by the abrupt linking of microcracks

关键词:

Hot Hydrostatic Extrusion of Mechanically Alloyed Al-4.9Fe-4.9Ni Powders

Guoxian LIANG , Zhimin LI and Erde WANG (Dept. of Metals Science and Technology , Harbin Institute of Technology , Harbin , 150001 , China)(To whom correspondence should be addressed)

材料科学技术（英）

Al-4.9 Fe-4.9 Ni alloy powders have been synthesized by mechanical alloying. The rnechanically alloyed powders are consolidated by hot hydrostatic extrusion. The results show that extrusion tempereture. extrusion ratio and lubricant have great effects on the quality of extruded rods and their mechanical properties, The mixture of graphite and glass powders as lubricant can prevent the oxidization of cold compacted billet by cladding the billet with this lubricant before heating. This technique greatly simplifies the conventional densification process of powders

关键词:

Influence of Deformation and Heat Treatment on Seawater Corrosion of 70Cu-30Ni Alloy

Xiaolong ZHU(General Research Institute for Nonferrous Metals , Beijing 100088 , China)Tingquan LEI (Harbin Institute of Technology , Harbin , 150001 , China)

材料科学技术（英）

After deformed and annealed, 70Cu-30Ni alloy with irrecrystallization or incomplete recrystallization mainly consisting of deformed grains displayed unstable E.(corrosion potential) and low Rp (polarization resistance) in 3.5%NaCl, and corrosion product film contained a lot of seawater species in the outer layer and denickelified in the inner layer immersed in seawater for 3 and 6 months, and intergranular corrosion occurred in the matrix. With the increase of deformation and annealing temperature, the anodic oxide film formed by polarization in artificial seawater was increasingly stable. The recrystallized alloy was stable in Ec and high in Rp and its corrosion product film formed in seawater was uniform and rich in Ni.

关键词:

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