Microstructural evolution of nanocrystal-line Al-Zn-Mg-Cu alloy powders by cryomilling
YANG Bin; CHENG Junsheng; FAN Jianzhong; TIAN Xiaofeng; CHEN Hanbin ZHANG Jishan
State Key Laboratory for Advanced Metals and Materials; University of Science and Technology Beijing; International Centre for Materials Physics; The Chinese Academy of Sciences
Cite this article:
YANG Bin; CHENG Junsheng; FAN Jianzhong; TIAN Xiaofeng; CHEN Hanbin ZHANG Jishan. Microstructural evolution of nanocrystal-line Al-Zn-Mg-Cu alloy powders by cryomilling. Acta Metall Sin, 2005, 41(11): 1195-1198 .
Abstract Nanocrystalline Al-Zn-Mg-Cu alloy powders have been successfully fabricated by mechanically milling at cryogenic temperature (cryomilling) in liquid nitrogen. Microstructural evolution of the alloy powders during cryomilling was analyzed. The experimental results show that the as-atomized Al-Zn-Mg-Cu alloy powder size was gradually reduced and approached 35 nm after 15 h cryomilling. MgZn2 phase gradually disappeared and ultimately was super-saturated into α-Al. No significant grain growth for the nanocrystalline Al-Zn-Mg-Cu alloy was found when it was heated at or below 709 K, for example, the average grain size of the milling alloy heated at 709 K for 1 h is only 71 nm. The results obtained herein suggest that the significant thermal stability of the cryomilled Al-Zn-Mg-Cu material may be attributed to the presence of nano-scale Al2O3 particles.
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