Effect of hot extrusion on microstructures and mechanical properties of spray-formed 7055 aluminum alloy

被引：0

作者：

Liao, Kai-Ju ^{[1
]}

Wang, Ming-Pu ^{[1
]}

Yu, Hong-Chun ^{[1
]}

Chen, Chang ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Central South University, Changsha, China

来源：

Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy | 2015年 / 20卷 / 05期

关键词：

Billets (metal bars) - Defects - Diffraction - Tensile strength - Aluminum alloys - Metallic matrix composites - Textures;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A large-scale 7055 Al alloy billet was prepared by fully automatic controlled reciprocating spray forming technology. The initial microstructure and the effect of subsequent hot extrusion on the microstructures and mechanical properties of the 7055 alloy were studied. Texture of 7055 aluminum alloy after hot extrusion at different extrusion ratio was studied by electron back-scatter diffraction (EBSD) technology. The results show that the as-deposited billet has an equiaxed grain and homogeneous structure with a grain size of 30~50 μm and there is no dendrite segregation structure. Due to the characteristics of spray deposition process, there are a large number of micro-porosity defects in the alloy matrix. The ultimate tensile strength of as-deposited materials after hot extrusion rises to 390 MPa, and the elongation is 13.3%, which indicates that hot extrusion process can effectively eliminate the porosity defect. The result of electron back-scatter diffraction (EBSD) show that there exist and textures along the direction of extrusion axis in the hot extruded aluminum alloy bars. © 2015, Central South University. All right reserved.

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页码：802 / 807