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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Limit of structure refinement for 7075 aluminum alloy at elevated temperature by hot deformation
ZHANG Xiao-ming(张小明), ZHANG Ting-jie(张廷杰),
MA Guang-lai(马光来), TIAN Feng(田 锋),
LI Zhong-kui(李中奎), ZHOU Lian(周 廉)

Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China

Abstract:Performance of commercial alloys can be improved greatly by severe plastic deformation, which refines grain of metals to several micrometer or sub-micrometer order. Du, ring severe plastic deformation, the final size of grain structure depends on the following factors: strain rate, total strain, deformation temperature and so on. Under a certain condition, structure cannot be infinitely refined, which means that the size of grain has a limit with the increase of total strain. Under conventional hot deformation temperature, the grain size of 7075 aluminum alloy can be refined to 1-2 μm, and it will not become smaller with the increase of total strain, that is to say, the limit of grain refinement is about 1μm.

 

Key words:  7075 aluminum alloy; deformation refinement; ultra-fine grains

ISSN 1672-7029
CN 43-1423/U

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