Abstract

Mg–Sn–Ca–Mn–xAl (x = 0,1.5 wt%) alloys with ultra-fine recrystallized grains were prepared by conventional extrusion (400 °C, 0.5 mm/s). Effects of aluminum (Al) on mechanical properties and microstructure of the Mg–1Sn–1Ca–0.5Mn (wt%) alloy were systematically investigated. By the addition of 1.5 wt% Al, the yield strength of the as-extruded alloy significantly increased from 183 to 237 MPa. The as-cast alloys show a dendritic structure consists of α-Mg, (Mg, Al)₂Ca, and CaMgSn phases. The as-extruded Mg–1Sn–1Ca–0.5Mn–1.5Al alloys exhibit a bimodal grain structure composed of dynamic recrystallized (DRXed) fine grains and coarse unDRXed grains. Compared with Al free alloy, a lot of nano-scale planar Al₂Ca and rectangle shape Al₈Mn₅ precipitated in the as-extruded alloy with 1.5 wt% Al. Meanwhile, the addition of Al significantly strengthened alloys’ fiber texture with < 10–10 >//ED.

Graphic Abstract

中文翻译：

---

Al对Mg-Sn-Ca-Mn可锻合金组织和力学性能的影响

摘要

具有超细再结晶晶粒的 Mg-Sn-Ca-Mn-xAl (x = 0.1.5 wt%) 合金通过常规挤压 (400 °C, 0.5 mm/s) 制备。系统地研究了铝 (Al) 对 Mg-1Sn-1Ca-0.5Mn (wt%) 合金力学性能和显微组织的影响。通过添加 1.5 wt% Al，挤压态合金的屈服强度从 183 MPa 显着增加到 237 MPa。铸态合金显示出由α-Mg、(Mg, Al) ₂ Ca 和CaMgSn 相组成的树枝状结构。挤压态的 Mg-1Sn-1Ca-0.5Mn-1.5Al 合金具有双峰晶粒结构，由动态再结晶 (DRXed) 细晶粒和粗未 DRX 晶粒组成。与无Al合金相比，大量的纳米级平面Al ₂ Ca和矩形Al ₈ Mn ₅在含有 1.5 wt% Al 的挤压态合金中析出。同时，Al 的加入显着增强了合金的纤维织构，具有 < 10–10 >//ED。

图形摘要