Annealing-induced microstructural evolution and mechanical anisotropy improvement of the Mg-Gd-Y-Zr alloy processed by hot ring rolling
- 点击次数：
- 影响因子：3.342
- DOI码：10.1016/j.matchar.2018.08.022
- 发表刊物：Materials Characterization
- 关键字：Microstructural evolution; Mechanical anisotropy; Annealing treatment; Texture weakening; Mg-Gd-Y-Zr; Hot ring rolling
- 摘要：Hot ring rolling (HRR) is widely used to fabricate large-size seamless ring-shape components. However, this process produces a severe mechanical anisotropy, which is not acceptable in practical industrial application and should be avoided. This paper reports the annealing-induced microstructural evolution and mechanical anisotropy improvement of HRRed Mg-8.12Gd-1.82Y-0.35Zr alloy ring. Results show that annealing treatment could improve the microstructural homogeneity of the ring owing to the occurrence of static recrystallization (SRX). SRX grains are preferentially formed at twin boundaries and initial grain boundaries due to high dislocation density, high level of stored energy, and stress concentration. Twin boundaries, to some extent, can suppress the migration of SRX grain boundaries. In addition, occurrence of SRX weakens the texture intensity and basal pole inclination, leading to a decrease in the mechanical anisotropy of the ring. Considering the weakened anisotropy, comparable strength, and improved ductility, annealing + aging (T6), compared with direct aging (T5), is a more suitable heat treatment schedule for the HRRed Mg-8.12Gd-1.82Y-0.35Zr alloy ring.
- 合写作者：Chuming Liu, Shilun Yu, Shunong Jiang, Zhiyong Chen
- 第一作者：Yi Yao
- 论文类型：期刊论文
- 通讯作者：Yonghao Gao
- 学科门类：工学
- 一级学科：材料科学与工程
- 文献类型：J
- 卷号：144
- 页面范围：641-651
- 是否译文：否
- 发表时间：2018-10-01
- 收录刊物：SCI、EI
