材料期刊网

Isothermal Aging Kinetics in CuZnAl Shape Memory Alloy

Zengqi ZHAO Lab.of Physics , Baotou Research Institute of Rare Earth , Baotou , 014010 , ChinaFeixia CHEN Dazhi YANG Dept.of Mater.Eng. , Dalian University of Technology , Dalian , 116024 , ChinaEr BAO Dept.of Mater.Eng. , Yanshan University , Qinhuangdao , 066004 , China

材料科学技术（英文）

Isothermal aging behaviours of a CuZnAl shape memory alloy have been investigated by means of dilatometry.The length of the specimens during isothermal aging from 190 to 280℃ increases with the aging time at each temperature.The isothermal aging kinetics fits in Avrami equation and the time exponent n decreases with the increase in aging temperature.The apparent activation energy for the isothermal aging process was measured to be 109.0kJ/mol,which is about equal to that of a relaxation internal friction peak at about 200℃ (f≈1 Hz) in the alloy.

关键词: isothermal aging kinetics , null , null , null , null

MISCIBLE PRECIPITATES IN V-Ti-N MICROALLOYED STEELS

TANG Guoyi ZHENG Yangzeng Yanshan University , Qinhuangdao , ChinaCAI Qigong ZHU Jing Central Iron and Steel Research Institute , Beijing , China ZHENG Yangzeng Professor , Department of Material Engineering , Yanshan University , Qinhuangdao , China

金属学报(英文版)

The characteristics and the formation of the miscible particles in V-Ti-N microalloyed steels were studied.It was found that the vanadium to form V-Ti miscible particles starts to precipi- tate after pouring and cooling to temperature below 11 50℃ by means of the epitaxial precipi- tation on the pre-existing titanium nitrides.The vanadium content in the particles is markedly influenced by the cooling rate after solidification.

关键词: microalloyed steel , null , null

TUDY OFSTRAIN INDUCED MARTENSITE TRANSFORMATION FOR A MEDIUM MANGANE SESTEEL

M.Zhang Section of Scientific Research , Yanshan University , Qinhuangdao 066004 , China

金属学报(英文版)

The distribution of Cand Mn atomsinthe austenitic matrix isheterogeneous,the Mn atoms tendtooccupythefirst neighbour position ofthe Catomsin theaustenite. During deforma tion thethreekindsof martensitearestraininduced , havinginternal magneticfield valuese qualto33 0T, 30 5Tand 28 2Trespectively, andthe martensiteisstraininduced firstin the austenitecontainingless Cand Mn atoms.

关键词: medium manganese steel , null , null

Superplasticity in Aluminium Brass(HAl 66-6-3-2)

By SHEN Huanxiang GAO Shiyou SU Shenggui ** Dept.of Materials Engineering , Yanshan University , Qinhuangdao.066004 , China+ To whom correspondence should be addressed

材料科学技术（英文）

关键词: superplasticity , null , null