414a6a6f88a24e68acf5cd0f6a313fe820260415081907513depositorname@domain.comregistrantMatéria (Rio de Janeiro)Matéria (Rio J.)1517-70762024294XuanleZhiShaoyang University, China; Shaoyang University, Chinahttp://orcid.org/0009-0008-2721-3627ZhibingDingShaoyang University, China; Shaoyang University, China; Central South University, ChinaDongruiChenShaoyang University, China; Shaoyang University, ChinaShuaiZhangShaoyang University, China; Shaoyang University, ChinaWenminGuoShaoyang University, China; Shaoyang University, ChinaHaijiangWuShaoyang University, China; Shaoyang University, ChinaBinLiuCentral South University, ChinaHuaHouNorth University of China, ChinaYuhongZhaoNorth University of China, ChinaABSTRACT This research aims to investigate the microstructure evolution and related mechanical properties of Mg-9.5Gd-0.8Zn-0.5Zr alloys with different Y contents (x = 0, 1, 2, and 3wt%). The effects of different heat treatment conditions on these alloys were investigated. The results show that the initial microstructure of the as-cast alloy without Y is composed of α-Mg matrix and Mg5Gd phase. Additional phases such as Mg24(Gd,Y)5 and Mg24Y5 appeared with the increase of Y content. After homogenization treatment, these phases are transformed into high temperature stable 14H-LPSO phase. It is noteworthy that the precipitation of the β′ phases in peak-aged alloys significantly enhances the strength, while the addition of Y enhances the plasticity. 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