Microstructure and Properties of As-cast Mg-xSn-2La Alloy

Zhang Xiaoping; Chen Yungui; Xiao Sufen; Tang Yongbai; Niu Gao; Wei Shanghai; Zhao Yuanhua

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Microstructure and Properties of As-cast Mg-xSn-2La Alloy
Vol. 29, Issue 3, Pages: 266-269(2009)
Published： 2009 ，
DOI：

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[1]章晓萍,陈云贵,肖素芬,唐永柏,牛高,魏尚海,赵源华.铸态Mg-xSn-2La合金的组织与性能[J].特种铸造及有色合金,2009,29(03):266-269+194-195.

Zhang Xiaoping, Chen Yungui, Xiao Sufen, et al. Microstructure and Properties of As-cast Mg-xSn-2La Alloy. [J]. Special Casting & Nonferrous Alloys 29(3):266-269(2009)
[1]章晓萍,陈云贵,肖素芬,唐永柏,牛高,魏尚海,赵源华.铸态Mg-xSn-2La合金的组织与性能[J].特种铸造及有色合金,2009,29(03):266-269+194-195. DOI：

Zhang Xiaoping, Chen Yungui, Xiao Sufen, et al. Microstructure and Properties of As-cast Mg-xSn-2La Alloy. [J]. Special Casting & Nonferrous Alloys 29(3):266-269(2009) DOI：

摘要

采用光学金相显微镜、SEM、EDS、XRD分析以及拉伸试验等试验手段

研究了Mg-xSn-2La（x=2.34、4.68、7.02、9.36）合金铸态下的组织和性能。结果表明

当Sn含量为2.34%时

合金主要由α-Mg和Mg-La-Sn稀土相组成;随着Sn含量增加

Mg2Sn数量增多

Mg-La-Sn稀土相逐渐粗化

细小的颗粒状稀土相减少

棒状稀土相增加

并且逐渐由晶界向枝晶间界分布

合金的抗拉强度与伸长率明显提高。Mg-7.02Sn-2La合金具有最高的抗拉强度（151MPa）

而Mg-4.68Sn-2La具有最高的伸长率（12.7%）

但是过多的Sn反而会导致合金力学性能下降。

Abstract

Microstructure and properties of Mg-xSn-2La（x=2.34～9.36）alloy were investigated by OM（optical microscope）

SEM（scanning electron microscope）

XRD（X-ray diffraction）and EDS（energy dispersive spectrum）.It is found that with 2.34% Sn content

the alloy is mainly composed of α-Mg phase and Mg-La-Sn phase.With increasing in Sn content

Mg2Sn phase in the alloy is increased greatly and Mg-La-Sn phase is gradually coarsened

meanwhile

fine granular phase is decreased as rod-like phase increases.Furthermore

more RE phase tends to distribute along the interdentritic boundaries not to along grain boundary.In addition

tensile strength and elongation of the alloy are improved greatly with Sn addition.Mg-7.02Sn-2La alloy exhibits the optimum tensile strength of 151MPa while the Mg-4.68Sn-2La alloy shows the desirable elongation of 12.7%.However

excessive Sn addition can be detrimental to the mechanical properties of the magnesium alloy.