Eects of T5 Treatment on Microstructure andMechanical Properties at Elevated Temperature of AZ80-Ag Alloy
发布时间：2021-07-12
点击次数：
DOI码：10.3390/ma12193214
发表刊物：Materials
关键字：AZ80-Ag alloy; T5 treatment; creep; precipitation.
摘要：Effects of T5 treatment on microstructure and mechanical properties at elevated temperature of hot-ring-rolled (HRRed) AZ80-Ag magnesium alloy were systematically investigated. Results show that, after aging at 175 °C for 36 h, discontinuous and continuous precipitates form inside grains, with the former one taking up a volume fraction of ~64.9%. T5 treatment improves the tensile strength at ambient temperature of the alloy but weakens its tensile strength and creep resistance at elevated temperatures (120-175 °C), indicating opposite effects of T5 on mechanical properties at ambient and elevated temperatures. During creep at 120-175 °C and under 70-90 MPa, the dynamic precipitation process in HRRed specimen is accelerated with increasing temperature. At 150-175 °C massive nucleation and growth of dynamic discontinuous precipitates could result in an atypical primary creep stage, consisting of deceleration and acceleration creep stages, which is reported in wrought Mg-Al-based alloy for the first time. Such primary creep stage can be eliminated by T5 treatment. Besides, diffusion-controlled dislocation creep is the dominant creep mechanism for both HRRed and T5 specimens.
合写作者：Chuming Liu, Shunong Jiang, Shilun Yu, Zhiyong Chen
第一作者：Gang Zeng
论文类型：期刊论文
通讯作者：Yonghao Gao
论文编号：3214
卷号：12
是否译文：否
发表时间：2019-09-30
收录刊物：SCI