Microstructure and tensile properties of as-extruded Mg-Sn-Y alloys

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. B07; pp. 493 - 497
• Main Author: 赵宏达 秦高梧 任玉平 裴文利 陈冬 郭运
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2010; Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang 110004,China
• Subjects: Alloys; Extrusion; Magnesium base alloys; Mg-Sn-Y alloy; Microstructure; Optical microscopy; Tensile properties; tensile property; Tensile tests; Ultimate tensile strength; 平均晶粒尺寸; 扫描电子显微镜; 拉伸性能; 显微组织; 极限拉伸强度; 热挤压; 镁合金; microstructure; Mg-Sn-Y alloy; tensile property; extrusion
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(10)60525-0

The microstructure and tensile properties of the Mg-1.0%Sn-xY（x=1.5%,3.0%,3.5%,atom fraction）alloys extruded indirectly at 350℃ were investigated by means of optical microscopy,scanning electron microscopy and tensile test.The mean grain sizes ofα-Mg matrix in the three extruded alloys are 6,8 and 12μm,respectively,slightly increasing with the addition of Y. The relationship between microstructure and strength was discussed in detail.The results show that the addition of Y has little effect on the grain refinement of the as-extruded Mg-Sn based alloys above.The only MgSnY phase is detected in the Mg-Sn-1.5%Y alloy, and the Sn3Y5 phase in the Mg-Sn-3.5%Y alloy,whereas both of them simultaneously exist in the Mg-Sn-3.0%Y alloy.The particle shape of MgSnY and Sn3Y5 phase,inherited from the solidification,has little change before and after hot extrusion.Mg-Sn-3.0%Y alloy has the highest ultimate tensile strength（UTS）,305 MPa,by over 50%compared with that of the other two alloys.