Microstructure evolution and thixoextrusion of AZ91D magnesium alloy produced by SSTT
The semi-solid thermal transformation (SSTT) route was used to obtain semi-solid billets for thixoextrusion. Microstructurai 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％.
AZ91D magnesium alloy microstructure semi-solid thermal transformation thixoextrusion
CHENG Yuan-sheng CHEN Qiang HUANG Zhe-qun HUANG Shu-hai
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China Southwest Technique and Engineering Institute, Chongqing 400039, China
国际会议
北京
英文
739-743
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）