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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Effect of hot extrusion on microstructure and mechanical properties of quasicrystal-reinforced Mg-Zn-Y alloy
ZHENG Ming-yi(郑明毅)1, QIAO Xiao-guang(乔晓光)1
XU Shi-wei(徐世伟)1, GAN Wei-min(甘为民)1, WU Kun(吴昆)1
S.Kamado2

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 
2. Department of Mechanical Engineering, Nagaoka University of Technology, 
Nagaoka 940-2188, Japan; 
3. Institute of Materials Engineering, GKSS-Research Center, D21502, 
Geesthacht, Germany

Abstract: The microstructure and mechanical properties of as-cast and as-extruded Mg-Zn-Y alloy (Mg-11%Zn-0.9%Y, mass fraction) containing Mg3YZn6 quasicrystal were studied. The eutectic icosahedral quasicrystal phase (I-phase) is broken and almost distributes along the extrusion direction, and fine I-phase with nano-size is precipitated during the extrusion. The α-Mg matrix grains are refined due to recrystallization occuring during the hot extrusion. Some {10(-1)2} twins are observed in the extruded ZW1101 alloy. And {0002}〈10(-1)0〉 fiber texture is formed in matrix alloys after hot extrusion. The extruded alloy exhibits high strength in combination with large elongation at room temperature. The strengthening mechanism of the as-extruded alloy was discussed.

 

Key words:  magnesium alloys; quasicrystal; extrusion; microstructure; mechanical properties

ISSN 1672-7029
CN 43-1423/U

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