点击次数：

论文类型：期刊论文

发表时间：2008-12-01

发表刊物：TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA

收录刊物：SCIE、EI、ISTIC、Scopus

卷号：18

期号：SPEC. ISSUE 1

页面范围：S86-S90

ISSN号：1003-6326

关键字：sub-rapid solidification; grain size; mechanical property; fracture surface morphology

摘要：The microstructure of sub-rapid solidification processed AZ61A magnesium alloy was presented and discussed. The results show that the grain size of the foil is significantly refined, and the grain morphology is cellular or globular. The eutectic transformation L ->alpha-Mg+beta-Mg(17)Al(12) and microsegregation in conventionally solidified AZ61A alloy are suppressed to a great extent. The beta-Mg(17)Al(12) phases located in the alpha-Mg grain boundaries are largely decreased due to high solidification cooling rate. As a consequence, the alloying elements Al, Zn, Mn show much higher solid solubility and the sub-rapid solidification microstructure dominantly consists of supersaturated alpha-Mg solid solution. The mechanical proper-ties and fractographic analysis reveal that the fracture mechanism and corresponding morphology of the rapture surface of tensile bars are linked to the microstructure obtained and depend on the sub-solidification processes.