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富镧混合稀土对Mg-10Li-4Al合金组织和力学性能的影响

Influences of La-Rich RE on the Microstructure and Mechanical Properties of Mg-10Li-4Al Alloy

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【作者】 刘滨张密林胡耀宇巫瑞智

【Author】 LIU Bin,ZHANG Mi-lin,HU Yao-yu,WU Rui-zhi(Key Laboratory of Superlight Materials and Surface Technology(Harbin Engineering University),Ministry of Education,Harbin 150001,China)

【机构】 哈尔滨工程大学教育部超轻材料与表面技术重点实验室哈尔滨工程大学教育部超轻材料与表面技术重点实验室 哈尔滨150001哈尔滨150001

【摘要】 研究了不同添加量的富镧混合稀土对Mg-10Li-4Al合金显微组织的影响,分析了稀土化合物在合金中的作用,测量了铸态合金室温力学性能。研究表明,富镧混合稀土加入后,细化了晶粒,合金中生成短棒状稀土化合物Al3La,抑制了合金中MgLiAl2相和Mg17Al12相的生成,提高了合金的力学性能;当Al3La数量增多时,合金强度缓慢提高,延伸率下降。

【Abstract】 The influence of varied contents misch metal on microstructure of the Mg-10Li-4Al alloys was studied,and the effect of RE-compound in alloys was analyzed as well.In addition,the mechanical properties of alloys at room temperature were measured.The results indicate that the additions of lanthanum misch metal refine the grain and lead to the formation of rod-shaped Al3La compound which restrains the formation of Mg17Al12 and MgLiAl2 phases,consequently,the mechanical properties were improved.With the increasing amount of Al3La compound in alloy and it size become to coarsening,the strength of the alloys improved slowly and the elongation decreased.

  • 【文献出处】 航空材料学报 ,Journal of Aeronautical Materials , 编辑部邮箱 ,2007年05期
  • 【分类号】TG113
  • 【被引频次】27
  • 【下载频次】276
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