东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (12): 1750-1753.DOI: -

• 论著 • 上一篇    下一篇

面向生物医用的镁合金成分及凝固组织研究

管仁国;王付兴;李江委;朱立杰;   

  1. 东北大学材料与冶金学院;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2008-12-15 发布日期:2013-06-22
  • 通讯作者: Guan, R.-G.
  • 作者简介:-
  • 基金资助:
    国家高技术研究发展计划项目(2007AA03Z111);;国家自然科学基金资助项目(50604007);;辽宁省自然科学基金资助项目(20062016)

Composition and microstructure of biomedicine-oriented magnesium alloys

Guan, Ren-Guo (1); Wang, Fu-Xing (1); Li, Jiang-Wei (1); Zhu, Li-Jie (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2008-12-15 Published:2013-06-22
  • Contact: Guan, R.-G.
  • About author:-
  • Supported by:
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摘要： 通过对镁合金铸锭后显微组织的观察,结合SEM能谱分析,研究了Ca,Mn元素对镁合金组织的影响.研究发现,Mg-2.0Mn的显微组织是由基体组织(α-Mg)和点状析出的组织(α-Mn)组成;Mg-0.5Ca的显微组织是由(α-Mg)基体组织和非平衡结晶形成的Mg2Ca相组成.Ca,Mn对镁合金的组织均有细化作用,当同时加入Ca,Mn合金元素时,镁合金的显微组织会更加细小,晶粒趋于均匀圆整,同时第二相颗粒减少.其原因是:Ca提高了Mn与镁合金的润湿性,提高了Mn的溶解与扩散能力,温度降低Mn原子从合金中析出,为合金凝固提供了大量的晶核.

关键词: 凝固, 镁合金, 显微组织, 锰, 钙

Abstract: The effects of Ca and Mn on the microstructure of as-cast Mg alloy were investigated. Through the microstructure observation of Mg alloy ingot and SEM energy spectrum analysis. It is found that: the Mg-2.0Mn alloy is composed of a-Mg matrix and α-Mn point precipitates and Mg-0.5Ca alloy is composed of a-Mg matrix and Mg2Ca phase formed due to non-equilibrium solidification. Ca and Mn elements can provide grain refinement for the microstructure of Mg alloy. Finer microstructure can be obtained if Ca and Mn are added into the alloy simultaneously, with more homogenous and roundness grains and decreased amount of second-phase particles. The reasons are that the wettability of Mn is improved by Ca to enhance the dissolubility and diffusivity of Mn, and the decreasing temperature enables the Mn atoms to be precipitated continuously from the α-Mg matrix, thus providing lots of crystalline nucleus for alloy solidification.

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