Microstructure optimization and mechanical properties of lightweight Al-Mg2Si in-situ composite

被引：11

作者：

Chen, Xiaoxian ^{[1
]}

Liu, Hao ^{[1
]}

Zhan, Yongzhong ^{[1
]}

Tang, Hongqun ^{[1
]}

机构：

[1] Guangxi Univ, Coll Mat Sci & Engn, Nanning 530004, Guangxi, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2016年 / 107卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Al-Mg2Si composite; Microstructure; Er addition; Hot extrusion; Cooling rate; TENSILE PROPERTIES; MG2SI/AL-SI-CU COMPOSITE; EXTRUSION TEMPERATURE; COOLING RATE; ALLOYS; MG2SI; POROSITY; MMCS; CU; ER;

D O I：

10.3139/146.111405

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

This research investigated the effects of Er addition (01 wt.%), cooling rate and hot extrusion on the microstructure, hardness and tensile properties of Al-15 wt.% Mg2Si in-situ composite. The results show that addition of Er with high concentrations changes primary Mg2Si particles from irregularly shaped to polygonal shaped and also transforms needle-shaped Al5FeSi compounds into a short rod morphology. Microstructural studies revealed that water-cooling is more beneficial to acquire polygon shaped primary Mg2Si and fish-bone Al3Er. Through hot extrusion, the networks of eutectic Mg2Si phase and fish-bone Al3Er compound are broken. In addition, the results of tensile testing show that both Er addition and water-cooling improve the ultimate tensile strength and elongation. The optimum tensile behavior was achieved by adding 0.6 wt.% Er to the water-cooled Al-Mg2Si composite after hot extrusion.

引用

页码：842 / 850

页数：9

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