研究挤压和热处理对Mg?8Zn?1Al?0.5Cu?0.5Mn镁合金显微组织和力学性能的影响。结果表明，合金在230和260°C挤压时呈现双峰组织，而在290°C挤压时合金发生了完全的动态再结晶。随着挤压温度的升高，合金动态再结晶越充分，从而使其基面织构降低。通过研究4种不同的热处理制度对290°C下挤压成型合金的影响发现，经过固溶+时效处理后，合金的晶粒发生明显长大。与固溶+单级时效的合金相比，固溶+双级的工艺能显著细化析出相，提高析出相的密度。同时，经固溶+双级时效处理后合金的力学性显著提高，其屈服强度、抗拉强度和伸长率分别为298 MPa、348 MPa和18%，这主要是由细小的再结晶晶粒与均匀弥散分布的第二相共同作用的结果。
The effectsof extrusion and heat treatments on the microstructure and mechanical properties of Mg?8Zn?1Al?0.5Cu?0.5Mn magnesium alloywereinvestigated. Bimodal microstructureisformed in this alloy when itis extruded at 230and 260°C, and complete DRX occurs at the extruding temperatureof290°C. The basal texture of as-extruded alloys is reduced gradually with increasing extrusion temperature due to the larger volume fraction of recrystallized structure at higher temperatures. For the alloy extruded at 290°C, four different heat treatments routeswereinvestigated. After solution + aging treatments, the grains sizes become larger. Finer and far more densely dispersed precipitatesarefound in the alloy with solution + double-aging treatmentscompared with alloy with solution + single-aging treatment. Tensile properties are enhanced remarkably by solution + double-aging treatment with the yield strength, tensile strength andelongationbeing298MPa, 348MPa and 18%, respectively. This is attributed to the combined effects of fine dynamically recrystallized grains and the uniformly distributed finer precipitates.
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