Effects of Al addition to a Mg–Sn–Ca ternary alloy on its microstructure and tensile properties after extrusion were studied via extrusion of Mg-1.0Sn-0.5Ca-xAl (x ​= ​0, 0.8, 2.4 ​wt%) sheets and analysis of the extruded materials. The results showed that Al addition not only refined the grain size (from 9.8 ​± ​0.7 ​μm to 8.3 ​± ​0.4 ​μm and 7.6 ​± ​0.5 ​μm) but also accelerated the generation of more second phase (from 0.98 to 1.72 and 4.32%). Except for the CaMgSn and Mg₂Ca in Mg-1.0Sn-0.5Ca alloy, new phase (Mg, Al)₂Ca appeared after Al addition. The addition of Al into Mg–Sn–Ca alloy induced the textural variation from an initially ED-split double-peaked texture to a weakened texture, i.e., divergent elliptical texture, due to the effect of particle stimulated nucleation. This eventually contributed to the improvement of mechanical anisotropy as well as the higher Hc value and n-value. For the strain hardening behavior when tension along the TD, the prolonged stage Ⅱ of Al-modified alloys was closely connected with the additional TD textural components, accelerating the activation of more basal slip. The decreased θⅢ0 in stage Ⅲ of Al-modified alloys is beneficial to the grain refinement and the emergence of more second phase.

通过挤压 Mg-1.0Sn-0.5Ca- x Al ( x  = 0, 0.8, 2.4 wt%)研究了在 Mg-Sn-Ca 三元合金中添加 Al 对其组织和拉伸性能的影响片材和挤压材料的分析。结果表明，Al的添加不仅细化了晶粒尺寸（从9.8±0.7μm到8.3±0.4μm和7.6±0.5μm）而且加速了更多第二相的生成（从0.98到 1.72 和 4.32%）。除了Mg-1.0Sn-0.5Ca 合金中的 CaMgSn 和 Mg ₂ Ca 外，新相 (Mg, Al) ₂Ca在Al添加后出现。在 Mg-Sn-Ca 合金中加入 Al 引起了从最初的 ED 分裂双峰织构到弱织构的织构变化，即发散的椭圆织构，这是由于粒子刺激成核的影响。这最终有助于改善机械各向异性以及更高的 Hc 值和n值。对于沿TD拉伸时的应变硬化行为，Al改性合金的延长阶段II与额外的TD织构组分密切相关，加速了更多基底滑移的活化。降低的θ以Al改性的合金的阶段ⅢⅢ0是将晶粒细化和多个第二相的出现是有益的。