Abstract The microstructure and mechanical properties of a Mg-Zn-La alloy with and without Ca were investigated in the present study. Results indicated that small addition of Ca in Mg-Zn-La alloy induced the formation of Ca2Mg6Zn3 phase distributing at grain boundaries in the as-cast state and promoted dynamic precipitation in the as-extruded state. The existence of fine precipitates postponed dynamic recrystallization and refined dynamically recrystallized (DRXed) grains for Ca containing alloy. However, small addition of Ca did not affect the texture of the as-extruded Mg-Zn-La alloy obviously. The yield strength was increased by 70% after minor Ca addition from 141 MPa of the as-extruded Mg-Zn-La alloy to 241 MPa of the as-extruded Mg-Zn-La-Ca alloy. The significant increase of strength was mainly ascribed to refined microstructure and dynamic precipitates.

中文翻译：

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微量Ca添加显着改善Mg-Zn-La合金力学性能

摘要 本研究研究了含Ca 和不含Ca 的Mg-Zn-La 合金的显微组织和力学性能。结果表明，在 Mg-Zn-La 合金中添加少量 Ca 会在铸态状态下诱导分布在晶界处的 Ca2Mg6Zn3 相的形成，并在挤压态促进动态析出。细小析出物的存在推迟了含钙合金的动态再结晶和细化的动态再结晶 (DRXed) 晶粒。然而，少量 Ca 的加入对挤压态 Mg-Zn-La 合金的织构没有明显影响。添加少量钙后，屈服强度从挤压态 Mg-Zn-La 合金的 141 MPa 增加到挤压态 Mg-Zn-La-Ca 合金的 241 MPa 后，屈服强度提高了 70%。