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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Manufacturing of aluminum alloy
ultra-thick plates by multidirectional
forging and subsequent rolling
ZHANG Hui(张  辉)1, LIN Gao-yong(林高用)1, PENG Da-shu(彭大暑)1,
YANG Li-bin(杨立斌)1, LIN Qi-quan(林启权)1,2

1.Department of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2.College of Mechanical Engineering, Xiangtan University,
Xiangtan 411105, China

Abstract:A combinatory large deformation model of multidirectional forging and subsequent rolling was proposed for producing high performance aluminum alloy ultra-thick plates. The results show that fine-grain (2~3μm) structures were obtained when total deformation coefficient λ=32 at 250~350℃ under a strain rate of about 0.1s-1. The development of fine-grained structure can be characterized by the formation of strain-induced high energy dislocation and then transforms into new grain under large deformation at moderate temperature. The very fine secondary particles formed during large deformation play important role in retain the stability of the fine-grained structures.

 

Key words: 7075 aluminum alloy; combination deformation model; forging; rolling

ISSN 1672-7029
CN 43-1423/U

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