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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 3    June 2002

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Effect of electropulse modification parameters
on  ingot macrostructure of Cu-Al-Ni
shape memory alloys
WANG Jian-zhong(王建中)1,2, CHEN Qing-fu(陈庆福)1,2,
CAO Li-yun(曹丽云)1, ZHAO Lian-cheng(赵连城)2

1. Department of Materials and Chemical Engineering, 
Liaonin g Institute of Technology, Jinzhou 121001, China;
2. School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China

Abstract:In order to improve ingot structure and to refine grain-size of Cu-Al-Ni shape memory alloys by means of electropulse modification, the effect of voltage, frequency and time of the pulse as well as the type of cooling mold on the macrostructure of ingot have been systematically studied. The results show that the above four parameters are important influencing factors on the ingot macrostructure. By appropriately adjusting the parameters, the macrostructure of polycrystalline Cu-Al-Ni ingot can be significantly improved and nearly fully equiaxied region of the ingot is obtained; the corresponding grain-size of the ingot can be dramatically reduced to less than 1/20 of that of unmodified.

 

Key words: electropulsation parameters; Cu-Al-Ni; shape memory; macrostructure

ISSN 1672-7029
CN 43-1423/U

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