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Effects of calcium, manganese and cerium-rich mischmetal additions on the mechanical properties of extruded Mg-Zn-Y alloy reinforced by quasicrystalline I-phase

机译：富含钙，锰和铈的混合稀土对准晶I相增强的挤压Mg-Zn-Y合金力学性能的影响

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摘要

The effect of calcium, manganese and cerium mischmetal additions on the mechanical properties of the extruded Mg-6Zn-1Y (wt%) alloy reinforced by quasicrystalline I-phase has been investigated. The tensile behaviour at room temperature can be rationalized on the basis of microstructural changes induced by the different elements added to the ternary alloy. The highest yield stress value corresponds to the material modified with cerium-rich mischmetal. Manganese addition leads to the best balance between strength and ductility while calcium addition has a negligible effect on the mechanical properties of ternary alloy. The analysis of the contributions of the different strengthening mechanisms operating during deformation reveals that grain size refinement is the main hardening contribution in all alloys mechanism followed by the strengthening due to coarse second phases. The hardening due to basal texture conferred by the existence of coarse non-recrystallized grains depends on the overall hardening induced by the rest of strengthening mechanisms.
机译：研究了添加钙，锰和铈的混合稀土元素对准晶态I相增强的挤压Mg-6Zn-1Y（wt％）合金力学性能的影响。室温下的拉伸行为可以根据由添加到三元合金中的不同元素引起的微观结构变化来合理化。最高屈服应力值对应于用富铈的稀土金属改性的材料。锰的添加导致强度和延展性之间的最佳平衡，而钙的添加对三元合金的机械性能影响可忽略不计。对变形过程中不同强化机制的贡献的分析表明，晶粒细化是所有合金机制中的主要硬化贡献，其次是由于粗大的第二相而导致的强化。粗大的非再结晶晶粒的存在赋予了基部组织导致的硬化取决于其余强化机制引起的整体硬化。

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