Effect of La on Microstructure and Mechanical Properties of In-situ Mg<sub>2</sub>Si/Al Alloy Composites

Liu Zheng; Bai Guangzhu; Xu Lina; Yu Zhaofu

doi:10.15980/j.tzzz.2015.09.001

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Effect of La on Microstructure and Mechanical Properties of In-situ Mg₂Si/Al Alloy Composites
Vol. 35, Issue 9, Pages: 897-901(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.09.001

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[1]刘政,白光珠,徐丽娜,余昭福.La对原位自生Mg_2Si/Al复合材料组织及性能的影响[J].特种铸造及有色合金,2015,35(09):897-901.

Liu Zheng, Bai Guangzhu, Xu Lina, et al. Effect of La on Microstructure and Mechanical Properties of In-situ Mg₂Si/Al Alloy Composites. [J]. Special Casting & Nonferrous Alloys 35(9):897-901(2015)
[1]刘政,白光珠,徐丽娜,余昭福.La对原位自生Mg_2Si/Al复合材料组织及性能的影响[J].特种铸造及有色合金,2015,35(09):897-901. DOI： 10.15980/j.tzzz.2015.09.001.

Liu Zheng, Bai Guangzhu, Xu Lina, et al. Effect of La on Microstructure and Mechanical Properties of In-situ Mg₂Si/Al Alloy Composites. [J]. Special Casting & Nonferrous Alloys 35(9):897-901(2015) DOI： 10.15980/j.tzzz.2015.09.001.

摘要

采用重力铸造法制备了原位自生Mg2Si/Al复合材料

研究了稀土La处理的Mg2Si/Al基复合材料的组织形貌和力学性能。结果表明

稀土La对Mg2Si/Al复合材料的凝固组织有影响;添加稀土处理的Mg2Si/Al基复合材料中的Mg2Si颗粒变得更加细小

La与Al相互作用形成Al11La3相可阻止Mg2Si相长大;添加La之后

铸态Mg2Si/Al基复合材料的力学性能得到改善

其抗拉强度和伸长率分别为108 MPa和2.56%。

Abstract

In-situ Mg2Si/Al composites were prepared by common gravity casting.Microstructure and mechanical properties of Mg2Si/Al composites contained La were investigated by SEM（scanning electron microscopy）and OM（optical microscopy）

tensile testing.The results indicate that effects of La on the microstructure of Mg2Si/Al alloy composites can be observed

and Mg2 Si particles treated by La in the composites is refiend which is attributed to Al11La3 phase formed by interaction between La and Al inhibiting Mg2 Si phase growth.The mechanical properties of the composites with La addition can be improved

where the maximum tensile strength and elongation of the composites reach 108 MPa and2.56%

respectively.