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Full Length Article | Open Access

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

Lirong Xiaoa, Xuefei Chena,b, Huiyan Ningc, Ping Jiangb, Yi Liua, Bin Chend, Dongdi Yine( ), Hao Zhoua( ), Yuntian Zhua,f
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
School of Mechanical and Electrical Engineering, Heilongjiang Institute of Technology, Harbin 150050, China
ThermoFisher Scientific, Shanghai 201210, China
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong 999077, China
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Abstract

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 ℃, 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.

Keywords

Interfacial compoundsFormabilityHigh temperature brittlenessGrain boundary sliding

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Journal of Magnesium and Alloys
Volume 10 Issue 9,
September 2022
Pages 2510-2515
DOI: 10.1016/j.jma.2021.06.018

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Cite this article:
Xiao L, Chen X, Ning H, et al. Unexpected high-temperature brittleness of a Mg-Gd-Y-Ag alloy. Journal of Magnesium and Alloys, 2022, 10(9): 2510-2515. https://doi.org/10.1016/j.jma.2021.06.018

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Received: 03 March 2021
Revised: 15 May 2021
Accepted: 14 June 2021
Published: 29 July 2021
© 2021 Chongqing University.

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