Microstructure evolution and thixoextrusion of AZ91D magnesium alloy produced by SSTT

被引：12

作者：

Cheng Yuan-sheng ^{[2
]}

Chen Qiang ^{[1
]}

Huang Zhe-qun ^{[2
]}

Huang Shu-hai ^{[1
]}

机构：

[1] SW Tech & Engn Inst, Chongqing 400039, Peoples R China

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2010年 / 20卷

关键词：

AZ91D magnesium alloy; microstructure; semi-solid thermal transformation; thixoextrusion;

D O I：

10.1016/S1003-6326(10)60573-0

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The semi-solid thermal transformation (SSTT) route was used to obtain semi-solid billets for thixoextrusion. Microstructural evolution during partial remelting was studied. Mechanical properties of thixoextruded billets were determined. The results show that the solid grain size decreases initially and then increases as the isothermal holding time increases. Furthermore, shape factor measurements show that the solid grains tend to become increasingly spheroidal after 10 min isothermal holding. With longer isothermal holding time, the degree of spheroidization slightly decreases. Middle ultimate tensile strength (263.3 MPa) is obtained for thixoextruded AZ91D alloy produced by the SSTT route, with a yield strength of 120.0 MPa and an elongation to fracture of 7.19%.

引用

页码：S739 / S743

页数：5

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