Unexpected high-temperature brittleness of a Mg-Gd-Y-Ag alloy

作者：Xiao, Lirong; Chen, Xuefei; Ning, Huiyan; Jiang, Ping; Liu, Yi; Chen, Bin; Yin, Dongdi^*; Zhou, Hao^*; Zhu, Yuntian

来源：Journal of Magnesium and Alloys, 2022, 10(9): 2510-2515.

DOI：10.1016/j.jma.2021.06.018

• Interfacial compounds
• Formability
• High temperature brittleness
• Grain boundary sliding

Rare earth (RE) can produce excellent precipitation hardening in Mg alloys. However, when forming a solid solution, it also deteriorates formability, a problem that can usually be overcome by raising deformation temperature. Here we report an unexpected observation of high temperature brittleness in a Mg-Gd-Y-Ag alloy. As the temperature reached 500 degrees C, the formability decreased drastically, leading to severe intergranular fracture under only 0.5% strain. This was caused by failure of grain boundaries, which are weakened by segregated interfacial compounds. (c) 2021 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University

• 单位
  Chinese Academy of Science; Southwest Jiaotong University; Nanjing University of Science and Technology