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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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Structure evolution of Cu-based shape memory powder during mechanical alloying
XIAO Zhu(肖 柱)1, 2, LI Zhou(李 周)1, 2, FANG Mei(方 梅)1, 2, LUO Ming(罗 明)1, 2, GONG Shen(龚 深)1, 2, TANG Ning(唐 宁)1, 2 1. School of Materials Science and Engineering, Central South University,

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Abstract:The microstructures of shape memory powders of Cu-Al-Ni prepared from pure powders of Cu, Al and Ni using the mechanical alloying(MA) technique were studied by means of hardness measurement, metallograph observation, XRD and SEM. The hardness reaches the peak as the increase in hardness due to plastic deformation and the decrease in hardness due to kinetic annealing reach a balance. The process of MA leads to the formation of a laminated structure, and the layer becomes thinner with an increase in milling time. The pre-alloyed shape memory powder can be formed by milling at 300 r/min for 50 h using a planetary ball mill.

 

Key words: mechanical alloying (MA); shape memory alloy; microstructure

ISSN 1672-7029
CN 43-1423/U

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