Microstructures and mechanical properties of homogenization and isothermal aging Mg–Gd–Er–Zn–Zr alloy
来源期刊：Rare Metals2016年第6期
论文作者：Kai Wen Wen-Bo Du Ke Liu Zhao-Hui Wang Shu-Bo Li
文章页码：443 - 449
摘 要：The effects of homogenization and isothermal aging treatment on the mechanical properties of Mg–12Gd–2Er–1Zn–0.6Zr（wt%） alloy were investigated. The precipitated long-period stacking order（LPSO） structure and the aging precipitation sequence of the conditioned alloys were observed and analyzed, respectively. The results indicate that the 14H-LPSO structure occurs after the homogenization treatment and the b0 phase forms after the isothermal aging process. These two independent processes could be controlled by the precipitation temperature range. The significant increase in the elongation of the as-cast alloy after homogenization treatment is attributed to the disappearance of the coarse primary Mg5（Gd, Er, Zn） phase and the presence of the 14H-LPSO structure. The precipitation sequence of the investigated alloy is a-Mg（SSS）/b00（D019）/b0（cbco）/b.Furthermore, the yield tensile strength（YTS） and ultimate tensile strength（UTS） values of the isothermal aging alloy have a great improvement, which could be attributed to the high density of the precipitated b0 phase.
摘要：The effects of homogenization and isothermal aging treatment on the mechanical properties of Mg–12Gd–2Er–1Zn–0.6Zr（wt%） alloy were investigated. The precipitated long-period stacking order（LPSO） structure and the aging precipitation sequence of the conditioned alloys were observed and analyzed, respectively. The results indicate that the 14H-LPSO structure occurs after the homogenization treatment and the b0 phase forms after the isothermal aging process. These two independent processes could be controlled by the precipitation temperature range. The significant increase in the elongation of the as-cast alloy after homogenization treatment is attributed to the disappearance of the coarse primary Mg5（Gd, Er, Zn） phase and the presence of the 14H-LPSO structure. The precipitation sequence of the investigated alloy is a-Mg（SSS）/b00（D019）/b0（cbco）/b.Furthermore, the yield tensile strength（YTS） and ultimate tensile strength（UTS） values of the isothermal aging alloy have a great improvement, which could be attributed to the high density of the precipitated b0 phase.
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