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采用新型的锥台强剪切挤压变形方法将AZ31镁合金棒材挤压成板材。通过金相显微镜、拉伸性能测试及断口扫描分析研究冷却方式对锥台剪切变形镁合金的显微组织与力学性能的影响。结果表明:经锥台强剪切挤压变形后,镁合金上下表面受到强剪切变形,发生了充分的动态再结晶,组织得到明显的细化;经水冷后,镁合金板材的屈服强度、抗拉强度、伸长率分别为165.2 MPa、283.4 MPa和19.8%,相比于空冷的晶粒组织更加细小均匀,抗拉强度和屈服强度更高,同时,与挤压前相比,其屈服强度、抗拉强度及伸长率分别提高59.9%、83.2%和67.8%。
AZ31 magnesium alloy bar is extruded into sheet by the new method of cone shear strong shear extrusion. The effects of cooling mode on the microstructure and mechanical properties of the frustoconical shear deformation magnesium alloy were studied by metallographic microscope, tensile test and fracture scanning analysis. The results show that the upper and lower surfaces of the magnesium alloy undergo strong shear deformation after strong shear deformation of the frustum, and the dynamic recrystallization takes place. The microstructure of the magnesium alloy is obviously refined. After the water cooling, the yield strength, Tensile strength and elongation were 165.2 MPa, 283.4 MPa and 19.8%, respectively, compared with the air-cooled grain structure is more fine and uniform, higher tensile strength and yield strength, at the same time, compared with before extrusion, yield The strength, tensile strength and elongation increased by 59.9%, 83.2% and 67.8% respectively.