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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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Deformation twins and twinning at ambient temperature in cryomilled Al-Zn-Mg-Cu alloy powders
CHEN Han-bin(陈汉宾)1, CHENG Jun-sheng(程军胜)2, YANG Bin(杨 滨)1, 3, ZHANG Ji-shan(张济山)1, TIAN Xiao-feng(田晓风)4, FAN Jian-zhong(樊建中)4

1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; 2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100080, China;3. International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, China; 4. Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China

Abstract:The nanocrystalline Al-Zn-Mg-Cu alloy powders were synthesized using cryomilling. Deformation twins and twinning at ambient temperature were observed in Al-Zn-Mg-Cu powders. Experimental results indicate that high strain rate at low temperature during cryomilling induces the formation of deformation twins by the climbing of the restricted dislocations in nano-scale grains, and the cryomilled powders at high energies and nonequilibrium state reduce the grain boundary energies by twinning.

 

Key words: cryomilling; Al-Zn-Mg-Cu alloy; twins; mechanism

ISSN 1672-7029
CN 43-1423/U

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