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Tuning texture and precipitation using Y/Gd atomic ratio in iso-concentration Mg-Y-Gd-Ag-Zr extruded alloys
Materials Characterization ( IF 4.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.matchar.2020.110473
Yu Zhang , Wei Rong , Yujuan Wu , Liming Peng

Abstract Three Mg–Y(–Gd)–Ag–Zr alloys with an iso-concentration of total alloying elements but different Y/Gd atomic ratios were hot extruded at 350 °C and their microstructures and mechanical properties were comparatively studied. Extruded Mg–2.4Y–0.4Ag–0.1Zr (at.%) base alloy shows a bimodal-grained structure composed of fine equiaxed recrystallised grains and coarse elongated unrecrystallised grains and has a 01 1 ¯ 0 //ED (extrusion direction) texture. In contrast, when Y is partially replaced with Gd, extruded Mg–1.6Y–0.8Gd–0.4Ag–0.1Zr (at.%) and Mg–0.8Y–1.6Gd–0.4Ag–0.1Zr (at.%) alloys with the Y/Gd atomic ratio of 2 and 0.5, respectively, exhibit a near fully recrystallised structure and have a [0001]//ED texture. While basal γ″ precipitates dominate but few β′ precipitates form in Mg–2.4Y–0.4Ag–0.1Zr alloy, a large number density of both β′ and γ″ precipitates form in Mg–1.6Y–0.8Gd–0.4Ag–0.1Zr and Mg–0.8Y–1.6Gd–0.4Ag–0.1Zr alloys after post-extrusion ageing. Precipitation in the Gd-containing alloys is considerably enhanced by partial substituting Y with Gd. The peak-aged Mg–1.6Y–0.8Gd–0.4Ag–0.1Zr alloy keeps a relatively good balance between grain boundary strengthening, dispersion strengthening and precipitation hardening and thus obtains a good combination of strength and ductility, whose room temperature tensile yield strength, ultimate tensile strength and elongation are 377 MPa, 479 MPa and 8.0%, respectively.

中文翻译:

在等浓度 Mg-Y-Gd-Ag-Zr 挤压合金中使用 Y/Gd 原子比调整织构和沉淀

摘要 在350 ℃下热挤压了三种合金元素浓度等浓度但Y/Gd原子比不同的Mg-Y(-Gd)-Ag-Zr合金,并对其显微组织和力学性能进行了比较研究。挤压 Mg–2.4Y–0.4Ag–0.1Zr (at.%) 基体合金显示双峰晶粒结构,由细等轴再结晶晶粒和粗细长未再结晶晶粒组成,并具有 01 1 ¯ 0 //ED(挤压方向)织构. 相反,当 Y 被 Gd 部分取代时,挤压出的 Mg–1.6Y–0.8Gd–0.4Ag–0.1Zr (at.%) 和 Mg–0.8Y–1.6Gd–0.4Ag–0.1Zr (at.%) 合金Y/Gd 原子比分别为 2 和 0.5 时,表现出接近完全再结晶的结构并具有 [0001]//ED 织构。虽然在 Mg-2.4Y-0.4Ag-0.1Zr 合金中基本的 γ″沉淀占主导,但很少有 β′沉淀形成,在挤压后时效后,Mg-1.6Y-0.8Gd-0.4Ag-0.1Zr 和 Mg-0.8Y-1.6Gd-0.4Ag-0.1Zr 合金中形成大量 β' 和 γ'' 沉淀物。通过用 Gd 部分取代 Y,含 Gd 合金中的沉淀显着增强。峰时效Mg-1.6Y-0.8Gd-0.4Ag-0.1Zr合金在晶界强化、弥散强化和沉淀硬化之间保持了较好的平衡,从而获得了良好的强度和延展性结合,其室温拉伸屈服强度,极限拉伸强度和伸长率分别为 377 MPa、479 MPa 和 8.0%。
更新日期:2020-09-01
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