Acta Metall Sin  2012, Vol. 48 Issue (3): 371-378    DOI: 10.3724/SP.J.1037.2011.00615

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EFFECTS OF Zn CONTENT ON MICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF INDIRECT-EXTRUDED Mg-8Sn-Zn ALLOYS

CHENG Weili1, 2), QUE Zhongping, ZHANG Jinshan, XU Chunxiang, LIANG Wei, YOU Bongsun2)

1) School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024 2) Korea Institute of Materials Science, Changwon 641-831, Republic of Korea

CHENG Weili QUE Zhongping ZHANG Jinshan XU Chunxiang LIANG Wei YOU Bongsun. EFFECTS OF Zn CONTENT ON MICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF INDIRECT-EXTRUDED Mg-8Sn-Zn ALLOYS. Acta Metall Sin, 2012, 48(3): 371-378.

Abstract References Related Articles Recommended Metrics Download:  PDF(5601KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The influence of Zn content on the microstructure evolution, texture and mechanical properties of indirect-extruded Mg-8wt.%Sn-Zn alloys have been investigated by OM, SEM, TEM, EBSD, XRD and a standard universal testing machine. The studied alloys were demonstrated to be extrudable at a relatively low temperature (250℃) and a high extrusion speed (2 m/min). During the extrusion process, most of the remained second phase particles present in the homogenized alloy are found to be aligned along the extrusion direction (ED) in the form of stringers after being broken into fragments during the extrusion process. While most of the coarse grains were changed into fine equiaxed grains with average sizes ranging from 10.5 μm to 7.4 μm. The volume fractions of the second phase particles increase with increasing Zn content while the grain size and texture strength decrease with increasing Zn content. These second phase particles are mainly composed of Mg2Sn, having a diameter of submicron and some nano-meter Zn-rich phases. Furthermore, the decrease in grain size can be explained by the Zener drag of fine particles. While, the textural weakening with Zn addition is associated with the decreased fraction of elongated grains retain strong fiber texture. The improvement in strength and reduction in yield asymmetry of the studied alloy were associated with finer grain size, higher fraction of second phase and weaker texture. Key words:  magnesium alloy      extrusion      microstructure evolution,      texture      mechanical property      Received:  28 September 2011      ZTFLH:  TG146.2   Fund:  Supported by Fundamental R&D Program for Core Technology of Materials Funded by the Korean Ministry of Knowledge Economy Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors CHENG Wei-Li QUE Zhong-Ping TANG Wei-Nai ZHANG Jin-Shan XU Chun-Xiang LIANG Wei URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00615     OR     https://www.ams.org.cn/EN/Y2012/V48/I3/371 [1] Mordike B L, Ebert T. Mater Sci Eng, 2003; A302: 37 [2] Kang D H, Park S S, Kim N J. Mater Sci Eng, 2005; A413–414: 555 [3] Park S S, You B S, Yoon D J. J Mater Pro Technol, 2009; 209: 5940 [4] Yang M, Pan F, Cheng L, Shen J. Mater Sci Eng, 2009; A512: 132 [5] Bettles C J, Gibson M A. JOM, 2005; 57: 46 [6] Mendis C L, Bettles C J, Gibson M A, Hutchinson C R. 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