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研究铸造及挤压Mg-12Zn-1.5Er合金的显微组织及力学性能。结果表明:铸造Mg-12Zn-1.5Er合金中的I相在挤压过程中被破碎,并且动态再结晶伴随着挤压过程发生,导致合金组织进一步细化。合金的晶粒为等轴晶,其平均晶粒尺寸为25μm;并且观察到大量的纳米级颗粒在动态再结晶晶粒中析出;与铸造合金相比,挤压合金的力学性能明显提高,这是因为组织细化、准晶强化及纳米级颗粒的析出强化;挤压合金的抗拉强度、屈服强度分别为359MPa和318MPa。
To study the microstructure and mechanical properties of the cast and extruded Mg-12Zn-1.5Er alloy. The results show that phase I in the as-cast Mg-12Zn-1.5Er alloy is crushed during the extrusion process, and dynamic recrystallization occurs with the extrusion process, resulting in the further refinement of the alloy structure. The grains of the alloy are equiaxed and have an average grain size of 25 μm; and a large number of nanoscale particles are observed to precipitate in the dynamically recrystallized grains; the mechanical properties of the extruded alloy are significantly increased compared to the cast alloy, which Is due to refinement of the organization, quasicrystal strengthening and precipitation strengthening of nano-sized particles; the tensile strength and yield strength of extruded alloy are 359MPa and 318MPa respectively.