Journal
JOURNAL OF MAGNESIUM AND ALLOYS
Volume 10, Issue 9, Pages 2510-2515Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/j.jma.2021.06.018
Keywords
Interfacial compounds; Formability; High temperature brittleness; Grain boundary sliding
Categories
Funding
- National Natural Science Foundation of China [52071178, 51901103, 51931003, 51601003, 51401172]
- National Key Research and Development Program of China [2017YFA0204403]
- Project of Natural Science Foundation of Heilongjiang Province [LH2019E080]
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In Mg-Gd-Y-Ag alloy, high temperature brittleness may occur due to weakened grain boundaries caused by segregated interfacial compounds.
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
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