Microstructure refinement and mechanical properties improvement of Al-Si-Fe alloys by hot extrusion using a specially designed high-strain die

被引:10
作者
Sakow, Shino [1 ,2 ]
Tokunaga, Toko [3 ]
Ohno, Munekazu [3 ]
Matsuura, Kiyotaka [3 ]
机构
[1] Hokkaido Univ, Grad Sch Engn, Kita Ku, Kita 13 Nishi 8, Sapporo, Hokkaido 0608628, Japan
[2] Caterpillar Japan LLC, Shimizu 1106-4, Akashi, Hyogo 6748686, Japan
[3] Hokkaido Univ, Kita Ku, Kim 13 Nishi 8, Sapporo, Hokkaido 0608628, Japan
关键词
Al-Si alloy; Intermetallic phase; Heteromorphic die extrusion; Elongation; BEHAVIOR;
D O I
10.1016/j.jmatprotec.2019.116447
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A heteromorphic extrusion die with right-angle corners in the die hole was designed in this study to give a high local strain to the extrudate metal during hot extrusion of Al-Si-Fe alloys, and the strain distribution in the extrudate metal was evaluated using the finite element method. It was demonstrated that the change in metal flow direction at the right-angle corners is effective for generating high strain in the extrudate metal and refining brittle inclusion particles such as primary Al9Si2Fe2 (beta phase) particles and eutectic Si particles. The refinement of these particles led to significant improvements in tensile elongation and plastic deformability in cold rolling of the alloys.
引用
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页数:9
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