Influence of Heat Treatment on Microstructures and Impact Toughness of Mg-Al-Zn Alloy

Release time:2021-07-12

Impact Factor:2.471

DOI number:10.1007/s11837-019-03585-7

Journal:JOM: the journal of the Minerals, Metals & Materials Society

Abstract:Microstructures and impact properties of the rolled Mg-8.10Al-0.46Zn-0.18Mn-0.18Ag (wt.%) alloy were investigated under various thermal conditions including as-rolled, solid solution (T4) and solid solution plus aging (T6) states. The results show that the impact toughness of the as-rolled alloy is slightly enhanced after solution treatment but remarkably reduced by the subsequent aging process, exhibiting a similar trend with the elongation of the alloy. Fractography analysis suggests that the impact toughness variations are closely associated with the changes in the deformation mode: the superior impact toughness of the as-rolled and T4 samples are mainly attributed to the occurrence of profuse twins during impact testing, while, in the T6 sample, the twinning activity is significantly suppressed due to the presence of beta-Mg17Al12 phases. In addition, the lamellar-shaped beta-Mg17Al12 phases are easy to fracture, which accelerates the crack propagation and thus degrades the impact property.

Co-author:Chuming Liu, Yingchun Wan, Jiansheng Wei, Yonghao Gao, Shunong Jiang, Zhiyong Chen

First Author:Longhui Mao

Indexed by:Journal paper

Document Code:WOS:000477633700053

Discipline:Engineering

First-Level Discipline:Materials Science and Engineering

Document Type:J

Volume:71

Issue:8

Page Number:2874-2883

ISSN No.:1047-4838

Translation or Not:no

Date of Publication:2019-09-01

Included Journals:EI、SCI