Microstructure and mechanical properties of Mg-Zn-Mn-Sn-Nd wrought alloys
来源期刊：Journal of Rare Earths2014年第1期
论文作者：胡光山 张丁非 郭非 蒋璐瑶 余大亮 潘复生
文章页码：52 - 56
摘 要：The microstructure and mechanical properties of as-cast and extruded Mg-6Zn-1Mn-4Sn-xNd（x=0, 0.5, 1.0, 1.5） alloys were investigated by means of optical microscopy（OM）, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and tensile test. The results showed that the dendrites sizes of these alloys were decreased by the addition of Nd. The phase compositions of the as-cast Mg-Zn-Mn-Sn-Nd alloys were dendritic α-Mg, MgZn2, Mg2 Sn, T phase and MgSnNd ternary phase. The mechanical properties of the as-extruded alloys were improved due to the refined equiaxed grains and dispersive Mg2 Sn and MgSnNd second phases. The comparison of the theoretical yield strength with the experimental yield strength revealed that the yield strength model of the as-extruded alloys should be modified as σys =σMg +σgb +σss +σsp.
胡光山1,2，张丁非1,2，郭非1,2，蒋璐瑶1,2，余大亮1,2，潘复生1,2
1. College of Materials Science and Engineering, Chongqing University2. National Engineering Research Center for Magnesium Alloys, Chongqing University
摘 要：The microstructure and mechanical properties of as-cast and extruded Mg-6Zn-1Mn-4Sn-xNd（x=0, 0.5, 1.0, 1.5） alloys were investigated by means of optical microscopy（OM）, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and tensile test. The results showed that the dendrites sizes of these alloys were decreased by the addition of Nd. The phase compositions of the as-cast Mg-Zn-Mn-Sn-Nd alloys were dendritic α-Mg, MgZn2, Mg2 Sn, T phase and MgSnNd ternary phase. The mechanical properties of the as-extruded alloys were improved due to the refined equiaxed grains and dispersive Mg2 Sn and MgSnNd second phases. The comparison of the theoretical yield strength with the experimental yield strength revealed that the yield strength model of the as-extruded alloys should be modified as σys =σMg +σgb +σss +σsp.
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