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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

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Evolution of precipitates of Al-Cu alloy during equal-channel angular pressing at room temperature
XU Xiao-chang(许晓嫦)1, LIU Zhi-yi(刘志义)1, LI Yun-tao(李云涛)1,
DANG Peng(党 朋)1, ZENG Su-min(曾苏明)1, 2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Department of Mechanical Engineering, Shaoyang Institute, Shaoyang 422004, China

Abstract:The evolution of precipitates and hardness changes in Al-Cu alloys during equal-channel angular pressing(ECAP) at room temperature were investigated by hardness measurement, X-ray diffraction analysis and transmission electron microscopy. The results show that with the increase of the total equivalent strain during ECAP from 0 to 8.4, the hardness of specimens with metastable θ″ phase increases first and decreases in later period. The hardness increases successively in specimens containing metastable θ′ phase and equilibrium θ phase. It is believed that the evolutions of hardness are related to the mechanism of re-dissolution of precipitates. A critical nuclei size concept is provided to express the mechanism of such re-dissolution of three precipitates in Al-Cu alloys.

 

Key words: Al-Cu alloy; re-dissolution; ECAP; precipitated phase

ISSN 1672-7029
CN 43-1423/U

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