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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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Effects of heat treatment and plastic deformation on structure and properties of Mg-9Al-1.2Nd-0.45Y-0.7Zn Mg alloy
LI Yong-jun(李永军)1, ZHANG Kui(张  奎)1, LI Xing-gang(李兴刚)1,
MI Xu-jun(米绪军)1, XIONG Bai-qing(熊柏青)1, HU Chun-li(胡春利)

1. State Key Laboratory for Fabrication and Processing of Non-ferrous Metals,
Beijing General Research Institute for Non-ferrous Metals, Beijing 100088, China;
2. Jinzhou Research Institute for Metallurgical Technology, Jinzhou 121000, China;

Abstract:The experiments of heat treatment, hot extrusion and hard drawing were employed to study their effects on the structure and mechanical properties of Mg-9Al-1.2Nd-0.45Y-0.7Zn magnesium alloy. The results indicate that the mechanical properties of the ingot are unstable and exhibit typical brittle failure. After heat treatment (693 K, 24 h), most β-Mg17Al12 phases decomposed into the α-Mg matrix and the distribution of Rare earths compounds remained the state of as-cast, which have little effects of the mechanical properties of the alloy. As the casting defects disappeared and the grain was refined after hot extruded, the mechanical properties of the alloy were drastically increased. By hard drawing, the ultimate tensile strength and the yield strength of the alloy were sharply increased while the elongation decreased rapidly. The failure of as-cast samples was mainly brittle fracture. After plastic deformation, the fracture patterns all exhibited ductile rupture features.

 

Key words: magnesium alloy; heat treatment; hot extrusion; hard drawing; structure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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