Friction stir processing (FSP) was used to modify the microstructure and improve the mechanical properties and corrosion resistance of an Mg–Al–Ca alloy. The results demonstrated that, after FSP, the grain size of the Mg–Al–Ca alloy was decreased from 13.3 to 6.7 μm. Meanwhile, the Al₈Mn₅ phase was broken and dispersed, and its amount was increased. The yield strength and ultimate tensile strength of the Mg–Al–Ca alloy were increased by 17.0% and 10.1%, respectively, due to the combination of fine grain, second phase, and orientation strengthening, while the elongation was slightly decreased. The immersion and electrochemical corrosion rates in 3.5 wt% NaCl solution decreased by 18.4% and 37.5%, respectively, which contributed to grain refinement. However, the stress corrosion cracking (SCC) resistance of the modified Mg–Al–Ca alloy decreased significantly, which was mainly due to the filiform corrosion induced by the Al₈Mn₅ phase. SCC was mainly controlled by anodic dissolution, while the cathodic hydrogen evolution accelerated the SCC process.

摩擦搅拌加工 (FSP) 被用来改变微观结构并提高 Mg-Al-Ca 合金的机械性能和耐腐蚀性。结果表明，经过 FSP，Mg-Al-Ca 合金的晶粒尺寸从 13.3 μm 减小到 6.7 μm。同时，Al ₈ Mn ₅相被破碎和分散，其量增加。由于细晶粒、第二相和取向强化的共同作用，Mg-Al-Ca 合金的屈服强度和极限抗拉强度分别提高了 17.0% 和 10.1%，而延伸率略有下降。在 3.5 wt% NaCl 溶液中的浸泡和电化学腐蚀速率分别降低了 18.4% 和 37.5%，这有助于晶粒细化。然而，改性Mg-Al-Ca合金的抗应力腐蚀开裂（SCC）能力显着下降，这主要是由于Al ₈ Mn ₅相引起的丝状腐蚀。SCC 主要受阳极溶解控制，而阴极析氢加速了 SCC 过程。