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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Influence of solidification conditions on mechanical properties of Mg-10Gd-3Y-0.5Zr magnesium alloy
LIN Jin-bao(林金保)1, 2, PENG Li-ming(彭立明)1,WANG Qu-dong(王渠东)1,
ZHOU Yang(周 阳)1, DING Wen-jiang(丁文江)1

1. National Engineering Research Center for Light Alloy Net Forming, Shanghai Jiao Tong University,
Shanghai 200030, China;
2. School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China

Abstract:Mg-10Gd-3Y-0.5Zr alloy was cast in a step-like mould with five different cooling rates. The as-cast microstructures of the different steps were examined with optical microscope(OM) and scanning electron microscope(SEM). The room temperature mechanical properties were examined by tensile test. The results show that the microstructures are refined and the second phase particles are distributed much uniformly with the increase of cooling rate. The increase of yield strength, ultimate strength and elongation can be ascribed mainly to the strengthening effect of fine grains. The relationship between grain size and yield strength/hardness agrees with the Hall-Petch behavior.

 

Key words: Mg-Gd-Y alloy; solidification condition; microstructure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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