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Acta Metall Sin  2014, Vol. 50 Issue (1): 41-48    DOI: 10.3724/SP.J.1037.2013.00352
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ZHAO Dongqing 1, 2), ZHOU Jixue 2), LIU Yunteng 2), DONG Xuguang 1), WANG Jing 1), YANG Yuansheng 1, 2)
1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2) Institute of New Materials Research, Shandong Academy of Sciences, Jinan 250014
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Abstract  Due to the high demand of light-weight alloys in automotive applications, wrought magnesium (Mg) alloys, applied as automotive sheet and extrusions, are attracting great attention. However, some inherent disadvantages of common wrought Mg alloys have limited their application, such as poor corrosion resistance, poor creep resistance and low formability. It is well known that Sn can provide thermally stable Mg2Sn particles in the matrix of magnesium alloys. Our previous study shows that the Mg-4Zn-2Al-2Sn alloy has potential to be developed into a wrought Mg alloy. Currently, the microstructure, texture and mechanical properties of Mg-4Zn-2Al-2Sn alloy extruded at temperatures of 225, 250 and 275 ℃ have been investigated, where complete dynamic recrystallization occurred during extrusion and the average grain size was reduced to 4.4, 7.1 and 10.5 μm, respectively. The amount and morphology of the second phases were directly influenced by the extrusion temperature. Extruded at 225 ℃, irregular Mg2Sn phase in size of 20~60 nm precipitated in the grains. With the extrusion temperature increasing to 275 ℃, Mg2Sn of about 500 nm and micron-size Mg32(Al, Zn)49 precipitates were observed. The {0002} texture was formed at 225 and 250 ℃ during the extrusion. While the temperature increased to 275 ℃, due to the activation of prismatic slip system, {1010}<0002> texture of prismatic plane parallel to extrusion direction was also observed. When compressive stress loaded along the extrusion direction, the {1010}<0002> texture suppressed the activation of the tensile twinning {1012}<1011>, which leads to a decrease of asymmetry between tension and compression.
Key words:  magnesium alloy      extrusion at low temperature      microstructure      mechanical property     
Received:  25 June 2013     
ZTFLH:  TG146.2  
Corresponding Authors:  YANG Yuansheng, professor, Tel: (024)23971728,   
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ZHAO Dongqing,),ZHOU Jixue ),LIU Yunteng ),DONG Xuguang ),WANG Jing ),YANG Yuansheng,). MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Mg-4Zn-2Al-2Sn ALLOYS EXTRUDED AT LOW TEMPERATURES. Acta Metall Sin, 2014, 50(1): 41-48.

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