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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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Microstructure and mechanical properties of Mg-5.6Li-3.37Al-1.68Zn-1.14Ce alloy
WANG Tao(王 涛)1, 2, ZHANG Mi-lin(张密林)1, WU Rui-zhi(巫瑞智)1

1. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education,
Harbin Engineering University, Harbin 150001, China;
2. College of Materials Science and Engineering, Jiamusi University, Jiamusi 154007, China

Abstract:Mg-5.6Li-3.37Al-1.68Zn-1.14Ce alloy was prepared using vacuum induction melting furnace. The microstructure and phases compostion of as-cast and as-extruded alloys were investigated by optical microscopy, energy dispersive X-ray spectroscopy, scanning electron mocroscopy and X-ray diffraction. The mechanical properties of these alloys were measured with tensile tester.  The results indicate that the as-cast alloy is composed of α(Mg) phase and rod-like Al2Ce compound. Al2Ce has the refining effect on the microstructure of alloy. During the extrusion at 523 K, dynamic recrystallization happens in the alloy. The dynamic recrystallization refines the grain size of alloy obviously. The phases are refined clearly after extrusion deformation, and the strength and ductility of the alloy are increased accordingly.

 

Key words: Mg-Li alloy; microstructure; extrusion deformation

ISSN 1672-7029
CN 43-1423/U

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