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

Lirong Xiao; Xuefei Chen; Huiyan Ning; Ping Jiang; Yi Liu; Bin Chen; Dongdi Yin; Hao Zhou; Yuntian Zhu

Journal of Magnesium and Alloys (Sep 2022)

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

Lirong Xiao,
Xuefei Chen,
Huiyan Ning,
Ping Jiang,
Yi Liu,
Bin Chen,
Dongdi Yin,
Hao Zhou,
Yuntian Zhu

Affiliations

Lirong Xiao: Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Xuefei Chen: Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
Huiyan Ning: School of Mechanical and Electrical Engineering, Heilongjiang Institute of Technology, Harbin 150050, China
Ping Jiang: State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
Yi Liu: Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Bin Chen: ThermoFisher Scientific, Shanghai 201210, China
Dongdi Yin: Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; Corresponding authors.
Hao Zhou: Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; Corresponding authors.
Yuntian Zhu: Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong 999077, China

Journal volume & issue: Vol. 10, no. 9
pp. 2510 – 2515

Abstract

Read online

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 °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.

Published in Journal of Magnesium and Alloys

ISSN: 2213-9567 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/journal-of-magnesium-and-alloys/

About the journal

Abstract

Keywords