航空学报 > 1994, Vol. 15 Issue (7): 860-865

低Zn、高RE含量Mg-Zn-Zr-RE合金的相组成

罗治平1, 张少卿1, 隗国1, 鲁立奇1, 汤亚力2, 赵东山2   

  1. 1. 北京航空材料研究所4室,北京,100095;2. 郑州工学院材料研究中心,郑州,450002
  • 收稿日期:1993-02-04 修回日期:1993-05-24 出版日期:1994-07-25 发布日期:1994-07-25

PHASE CONSTITUTIONS OF Mg-Zn-Zr-RE ALLOYS WITHLOW Zn AND HIGH RE ADDITIONS

Luo Zhiping1, Zhang Shaoqing1, Wei Guo1, Lu Liqi1, Tang Yali2, Zhao Dongshan2   

  1. 1. Faculty No. 4 of Beijing Institute of Aeronautical Materials, Beijing,100095;2. Materials Research Center, Zhengzhou Institute of Technology, Zhengzhou, 450002
  • Received:1993-02-04 Revised:1993-05-24 Online:1994-07-25 Published:1994-07-25

摘要: 研究了低Zn、高RE含量Mg-Zn-Zr-RE合金的铸态相组成。在含高品位Y的合金中,稀土相由晶界片状X相和晶内弥散分布的方形Mg_(24)Y_5相组成,并确定晶界片状X相为18R调制结构,调制周期为0.26nm。在含混合稀土的合金中,稀土相由Mg_(12)RE和晶内弥散分布的Mg_(24)Y_5相组成。分析表明,与MB25合金相比,晶粒细化、稀土相的晶界强化和弥散强化可能是低Zn、高RE含量Mg-Zn-Zr-RE合金的强化原因。

关键词: 稀土合金, 镁合金, 相-组成

Abstract: The phase constitutions of Mg-Zn-Zr-RE alloys with low Zn and high RE addi-tions have been studied.In the alloys containing high purity-Y, the X phase at the grain bounda-ries(GBs) and the small square shaped Mg_(24)Y_5 phase in the grain interior are presented.The structure of the X phase is determined as the 1 8 R modulated structure with periodicity of 0.26nm. In the alloys containing Y-or Ce-rich mischmetals,the net-shaped Mg_(12)RE phase at the GBs and the small square-shaped Mg_(24)Y_5 phase in the grain interior are presented. As compared with the MB25 alloy, the grain refining and the strengthening by the rare earth com-pounds at the GBs and in the grain interior may cause the high strength of this kind of alloy.

Key words: rare earth alloys, magnesium alloys, phases-constitution

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