The microstructures, mechanical properties and fracture behaviors of a new WE43 alloy (Mg–4Y–1.6Nd–2Sm–0.5Zr) were investigated. The microstructure of the as-cast alloy includes a Mg matrix, Mg 41 Sm 5 , Mg 41 Nd 5 and Mg 24 Y 5 eutectic phases, as well as β-phase. After an optimal solution treatment, the eutectic phases are almost completely dissolved; only a few spots of blocky Mg–Y compounds remain at grain boundaries. After an aging treatment, a large amount of β′-phases are dispersed and precipitated at the grain interior, which provides good comprehensive mechanical properties of the alloy, particularly in the under-aged state. The tensile strength is up to 290 MPa, the yield strength reaches 209 MPa, and the elongation is slightly improved. Furthermore, the fracture behaviors of the studied alloy in different states significantly differ. In addition, a comparison of mechanical properties of the new WE43, traditional WE43 and other modified WE43 alloys is presented.

中文翻译：

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新型WE43合金的显微组织、力学性能和断裂行为

研究了一种新型 WE43 合金（Mg-4Y-1.6Nd-2Sm-0.5Zr）的显微组织、力学性能和断裂行为。铸态合金的显微组织包括Mg基体、Mg 41 Sm 5 、Mg 41 Nd 5 和Mg 24 Y 5 共晶相以及β相。经过最佳固溶处理后，共晶相几乎完全溶解；只有少数块状 Mg-Y 化合物留在晶界。时效处理后，大量β'相在晶粒内部分散和析出，这为合金提供了良好的综合力学性能，特别是在欠时效状态下。抗拉强度高达290 MPa，屈服强度达到209 MPa，延伸率略有提高。此外，所研究合金在不同状态下的断裂行为显着不同。