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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 6    No. 1    March 1996

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EFFECT OF ELECTRIC CURRENT PULSE ONSUPERPLASTICITY OF ALUMINIUM ALLOY 7475
Li Yao,Chen Hong,Gu Yunqou,Hu Xinbin

Department of Mechanical Engineering,Hubei Institute of Technology,Wuhan 430068

Abstract:The superplastic deformation of aluminium alloy 7475 applied electric current pulse has  been studied. The results presented chat applying a high density current pulse raises hoth the elongation  rate and Ehe m value .and makes supperior superplastic properties at high strain rate of 10-2s-1,the op-timum deformation temperature could move from 530 ℃ to 480---510 ℃,TEM observation showed thesuperplastic deformation of the alloy is the results of grain boundary slips and dislocation slips in grains  under funetion of the electron wind; the intergranular tear is a main behavior of fracture of the alloy.

 

Key words: aluminium alloy 7475  superplasticity  electric  current pulse

ISSN 1672-7029
CN 43-1423/U

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