期刊论文

中文

金属热处理

0254-6051

2017

42

5

151-156

10.13251/j.issn.0254-6051.2017.05.031

51505143:国家自然科学基金 2015JJ3109:湖南省自然科学基金 2016T90759:中国博士后科学基金 2014M562128:中国博士后科学基金

本校为其他机构

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%。

Using a new frustum shearing extrusion, AZ31 magnesium alloy bars were extruded into sheets. Effect of cooling way on microstructure and mechanical properties of magnesium alloy processed by frustum shearing extrusion was studied by applying optical microscope, tensile properties test and SEM. The results show that the upper and lower surfaces of the magnesium alloy are subjected to severe shearing deformation after frustum shearing extrusion, triggering full dynamic recrystallization, thus dramatically refining the microstructure. As for the w...