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

被引：10
|
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
收藏
页码：842 / 850
页数：9
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