摘要
High temperature compressive tests of AZ91 Mg alloy were carried out at 573723 K and strain rates of 0.0011 s-1. The microstructures of as-compressed samples were observed by optical microscopy and transmission electron microscopy （TEM）, and the microhardness was also tested. It is shown that with the increase of temperature or the decrease of strain rate, the flow stress decreases, at the same time the dynamic recrystallization （DRX） of the alloy is more noticeable. The microstructures reveal that continuous dynamic recrystallization, which develops through conversion of low-angle grain boundaries into high-angle boundaries, occurs preferentially at the grain boundary.
High temperature compressive tests of AZ91 Mg alloy were carried out at 573723 K and strain rates of 0.0011 s^(-1). The microstructures of as-compressed samples were observed by optical microscopy and transmission electron microscopy (TEM), and the microhardness was also tested. It is shown that with the increase of temperature or the decrease of strain rate, the flow stress decreases, at the same time the dynamic recrystallization (DRX) of the alloy is more noticeable. The microstructures reveal that continuous dynamic recrystallization, which develops through conversion of low-angle grain boundaries into high-angle boundaries, occurs preferentially at the grain boundary.
出处
《中国有色金属学会会刊：英文版》
CSCD
2004年第2期306-310,共5页
Transactions of Nonferrous Metals Society of China
关键词
再结晶
AZ91合金
镁合金
动力学
高温
压缩变形
AZ91 magnesium alloy
high temperature compression
continuous dynamic recrystallization
