J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (6): 543-551.

• Light Weight Metals • 上一篇    下一篇

挤压态Mg-2Dy-0.5Zn 的显微组织和力学性能

毕广利1,房大庆2,Jothi Sudagar3,4,张庆鑫3,4,连建设4,江中浩4   

  1. 1. 吉林大学
    2. 太原科技大学材料科学与工程学院
    3.
    4. 吉林大学材料科学与工程学院
  • 收稿日期:2011-07-22 修回日期:2011-09-03 出版日期:2012-06-28 发布日期:2012-07-02
  • 通讯作者: 江中浩
  • 基金资助:

    大块纳米铜的脉冲电刷镀制备及临界晶粒尺寸附近的晶界和位错行为研究

Microstructure and Mechanical Properties of an Extruded Mg-2Dy-0.5Zn Alloy

Guangli Bi1), Daqing Fang2), Weichuan Zhang1), Jothi Sudagar1), Qingxin Zhang1), Jianshe Lian1), Zhonghao Jiang1)   

  1. 1) Key Lab of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China
    2) College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
  • Received:2011-07-22 Revised:2011-09-03 Online:2012-06-28 Published:2012-07-02
  • Contact: Zhonghao Jiang
  • Supported by:

    the National Natural Science Foundation of China (Grant No. 50771049)

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摘要： 研究了挤压态Mg-2Dy-0.5Zn (at.%)合金在180°C时效过程中的显微组织和力学性能。挤压态合金的显微组织由α-Mg，14H LPSO相和少量的(Mg, Zn)xDy 颗粒相组成。14H LPSO相在时效过程中形成并发展，且它的体积分数也随时效时间的增加而增大。拉伸测试结果显示，峰值态的合金在300°C显示了出色的高温性能，而在室温，100°C，200°C却显示了与挤压态和过时效态合金相似的力学性能。该优异的高温性能主要归结于LPSO相强化和晶粒细化。LPSO相的增强与它的含量和形貌相关。

Abstract: Microstructure and mechanical properties of an extruded Mg-2Dy-0.5Zn (at.%) alloy during isothermal ageing at 180 °C were investigated. Microstructure of the as-extruded alloy is mainly composed of α-Mg phase, 14H long period stacking order (LPSO) phase and small amounts of (Mg, Zn)xDy particle phases. During ageing, the 14H LPSO phase forms and develops and its volume fraction increases with increasing ageing time. Tensile test showed that the peak-aged alloy exhibits similar yield and ultimate tensile strengths and elongation to failure at room temperature, 100 °C and 200 °C, but excellent elevated temperature strengths at 300 °C as compared to the as-extruded and over-aged alloys. The analysis showed that the excellent elevated temperature strengths of the peak-aged alloy are attributed to the LPSO phase strengthening and the grain refinement strengthening, and the role of the LPSO strengthening is related to not only its amount, but also its morphology.

Key words: Magnesium, Mg-Dy-Zn alloy, Microstructure, Mechanical properties, Long period stacking ordered phase