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采用搅拌摩擦加工工艺制备了WE43稀土镁合金,研究了旋转速度和行走速度对WE43合金显微组织和力学性能的影响,探讨了组织转变规律及其作用机理。结果表明:搅拌摩擦加工处理的WE43合金主要由α-Mg、Mg24Y5和Mg41Nd5相组成;WE43合金的最佳搅拌摩擦加工工艺为旋转速度800 r/min、行走速度60 mm/min;搅拌摩擦加工可以起到细化晶粒、破碎粗大第二相和提高合金强塑性的作用,其强化机制主要为:固溶强化、细晶强化和第二相强化。
WE43 rare earth magnesium alloy was prepared by friction stir processing. The effects of rotational speed and traveling speed on the microstructure and mechanical properties of WE43 alloy were investigated. The microstructure and transformation mechanism of WE43 alloy were discussed. The results show that the WE43 alloy is mainly composed of α-Mg, Mg24Y5 and Mg41Nd5 phases. The optimal friction stir process of WE43 alloy is 800 r / min rotation speed and 60 mm / min walking speed. The friction stir processing Play the role of grain refinement, crushing the coarse second phase and improving the ductility of the alloy. The strengthening mechanisms are mainly solid solution strengthening, fine grain strengthening and second phase strengthening.