TY - JOUR N2 - Mg-0.5Si-xSn (x=0.95, 2.9, 5.02wt.%) alloys were cast and extruded at 593K (320 o C) with an extrusion ratio of 25. The microstructure and mechanical properties of as-cast and extruded test alloys were investigated by OM, SEM, XRD and tensile tests. The experimental results indicate that the microstructure of the Mg-0.5Si-xSn alloys consists of primary α-Mg dendrites and an interdendritic eutectic containing α-Mg, Mg2Si and Mg2Sn. There is no coarse primary Mg2Si phase in the test alloys due to low Si content. With the increase in the Sn content, the Mg2Si phase was refined. The shape of Mg2Si phase was changed from branch to short bar, and the size of them were reduced. The ultimate tensile strength and yield strength of Mg-0.52Si-2.9Sn alloy at the temperature of 473K (200 o C) reach 133MPa and 112MPa respectively. Refined eutectic Mg2Si phase and dispersed Mg2Sn phase with good elevated temperature stability are beneficial to improve the elevated temperature performance of the alloys. However, with the excess addition of Sn, large block-like Mg2Sn appears around the grain boundary leading to lower mechanical properties. L1 - http://journals.pan.pl/Content/104600/PDF/afe-2017-0154.pdf L2 - http://journals.pan.pl/Content/104600 PY - 2017 IS - No 4 DO - 10.1515/afe-2017-0154 KW - Low-silicon magnesium alloy KW - Eutectic Mg2Si KW - Microstructure KW - Mechanical behavior A1 - Fu, Xuesong A1 - Yang, Yan A1 - Ma, QuanYang A1 - Peng, Xiaodong A1 - Xu, Tiancai PB - The Katowice Branch of the Polish Academy of Sciences VL - vol. 17 DA - 2017 T1 - Microstructure and Mechanical Behavior of Mg-0.5Si-xSn Alloys UR - http://journals.pan.pl/dlibra/publication/edition/104600 T2 - Archives of Foundry Engineering ER -