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Influence of α Phase on Shape Memory Effect and Superelasticity of CuZnAI Alloy

QI Min ZHU Min ZHAO Xu YANG Dazhi ** Dept.of Materials Engineering , Dalian University of Technology , Dalian , 116023 , China*** Institute of Metals Research , Academia Sinica , Shenyang , 110015 , China+ To whom correspondence should be addressed

材料科学技术（英文）

The influence of a small amount of α phase in β′ matrix on shape memory effect and superelasticity of CuZnAl shape memory alloy has been studied systematically.It has been found that transformation temperature can be adjusted in a large scale by controlling the amount of α phase, meanwhile,shape memory effect and superelasticity do not decrease obviously when there exists a small amount of α phase.Based on the optical and trans- mission electron microscopy observation,the influ- ence of α phase on shape memory effect and superelasticity has been discussed.

关键词: αphase , null , null , null

Diffraction and Morphology Study of Surface Structures Accomponying with the Formation of α'Plate(Bainite)in a Cu-Zn-AI Alloy

ZHU Min AN Jiangying CHEN Feixia WANG Fengting YANG Dazhi ** Dept.of Materials Engineering , Dalian University of Technology , Dalian , 116023 , China+ To whom correspondence should be addressed

材料科学技术（英文）

In the present paper the morphologies of sur- face structures and the anomalous contrast of β_1 phase accompanying with the formation of bainite plate in the Cu-Zn-Al shape memory alloy have been investigated in detail by the transmission elec- tron microscopy and diffraction.The experimental results have proved that the extra diffraction and anomalous contrast results from the surface martensite formed on the β_1 phase.However,the crystal structure and morphology of the surface martensite are varied at different stage of bainite formation.The observation of interfacial disloca- tion structure of bainite/β_1 matrix reveals that there is a large strain in the bainite transformation of β CuZnAl alloy.Based on the experiment results the formation of surface martensite and bainitic transformation were discussed.

关键词: shape memory alloy , null , null

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