金属学报  2012, Vol. 48 Issue (3): 371-378    DOI: 10.3724/SP.J.1037.2011.00615

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Zn含量对反挤压Mg-8Sn-Zn合金组织演变和力学性能的影响

程伟丽1, 2), 阙仲萍1), 张金山1), 许春香1), 梁伟1), YOU Bongsun2)

1) 太原理工大学材料科学与工程学院, 太原 030024 2)  韩国材料科学研究所, 韩国 昌原641--831

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

程伟丽 阙仲萍 张金山 许春香 梁伟 YOU Bongsun. Zn含量对反挤压Mg-8Sn-Zn合金组织演变和力学性能的影响[J]. 金属学报, 2012, 48(3): 371-378.
, , , , , , . EFFECTS OF Zn CONTENT ON MICROSTRUCTURE EVOLUTION AND MECHANICAL PROPERTIES OF INDIRECT-EXTRUDED Mg-8Sn-Zn ALLOYS[J]. Acta Metall Sin, 2012, 48(3): 371-378.

摘要 参考文献 相关文章 Metrics 全文: PDF(5601 KB)   摘要: 利用OM, SEM, TEM, EBSD, XRD和电子材料试验机研究了Zn含量(1%---4%, 质量分数)对反挤压Mg-8Sn-Zn合金组织、织构演化 和力学性能的影响. 结果表明, 所有合金均可在相对较低的挤压温度(250 ℃)和较高的挤压速度\linebreak (2 m/min)下成形. 在反挤压过程 中, 所有在均质化处理后残留的粗大第二相在挤压过程中破碎并沿着挤压方向被拉伸成条带状; 所有的粗大晶粒均转变为细小的等 轴晶, 其平均晶粒尺寸分别为7.4, 8.3和10.5 μm.  随着Zn含量的增加, 在挤压态合金晶内和晶间分布的细小弥散第二相的体 积分数增加, 这些第二相主要由亚微米级的Mg$_{2}$Sn相和纳米级的富Zn相组成. 弥散分布在晶界上的第二相有效地钉扎了晶界, 从而细化了晶粒尺寸. 另外随着Zn含量的增加, 合金的织构强度降低, 这和变形晶粒的体积分数减小有关. 组织细化、织构弱化和 第二相弥散化是Mg-Sn-Zn合金强度提高和拉伸/压缩屈服点各向异性减弱的主要因素. 关键词 ： 镁合金,  挤压,  组织演变,  织构,  力学性能     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 收稿日期: 2011-09-28      ZTFLH:  TG146.2   基金资助: 韩国知识经济部重点技术和材料基础研究和发展项目 作者简介: 程伟丽, 男, 1982年生, 副教授, 博士 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 程伟丽 阙仲萍 唐伟能 张金山 许春香 梁伟 YOU Bong Sun 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00615      或      https://www.ams.org.cn/CN/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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