Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 21    No. 2    February 2011

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Microstructure and mechanical properties of
Mg-Zn-Y-Zr alloy prepared by solid state recycling
ZHAO Zu-de1, CHEN Qiang1, YANG Lin2, SHU Da-yu1, ZHAO Zhi-xiang1

1. Southwest Technique and Engineering Institute, Chongqing 400039, China;
2. Chongqing Institute of Coal Science Research Institute, Chongqing 400039, China

Abstract:Machined chips of Mg-Zn-Y-Zr alloy were consolidated by cold pressing and then hot extrusion under various processing temperatures and extrusion ratios. The results show that the microstructure of the chip-extruded alloy is marked by a large number of recrystallized grains and some unrecrystallized grains, which results in high strength but low ductility at temperatures below 320 °C. With increasing processing temperature up to 360 °C, entirely recrystallized and equiaxed grains are obtained. Mg-Zn-Y-Zr alloy with low strength but high ductility is obtained compared with the alloy processed at low temperature. At 420 °C, coarse and equiaxed grains are formed, which results in the drastic decrease of mechanical properties. With increasing extrusion ratio from 8 to 16, the grain refinement is more obvious and the mechanical properties at room temperature are improved effectively. However, the yield strength and ultimate tensile strength are improved a little with further increasing extrusion ratio.

 

Key words: Mg-Zn-Y-Zr alloy; extrusion ratio; solid state recycling; processing temperature

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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