Effects of strontium on microstructure and mechanical properties of as-cast Mg–5 wt.%Sn alloy

• Published in: Journal of alloys and compounds 2010-08, Vol.504 (2), p.345-350
• Main Authors: Liu, Hongmei, Chen, Yungui, Zhao, Haofeng, Wei, Shanghai, Gao, Wei
• Format: Article
• Language: English
• Subjects: Alloying additive; Condensed matter: structure, mechanical and thermal properties; Deformation and plasticity (including yield, ductility, and superplasticity); Elongation; Exact sciences and technology; Grain boundaries; High temperature; Magnesium base alloys; Magnesium–tin (Mg–Sn) alloys; Mechanical and acoustical properties; Mechanical and acoustical properties of condensed matter; Mechanical properties; Mechanical properties of solids; Microstructure; Physical properties of thin films, nonelectronic; Physics; Strontium; Strontium (Sr); Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Tensile properties; Thermal properties of condensed matter; Yield strength
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2010.05.156

The strontium (Sr) addition to the Mg–5 wt.%Sn alloy results in grain refinement and the formation of a rod-shaped and a bone-shaped MgSnSr intermetallic phase which are mainly straddle on the grain boundaries. The yield strength is improved, while the tensile strength and elongation first increased, and then decreased with a large addition of Sr. Optimum mechanical properties at ambient temperature are obtained at a content of 2.14 wt.%Sr. Tensile properties of the alloys at elevated temperatures are also improved, and the decrease of strength at elevated temperature slowed down with increasing Sr addition, indicating that Sr can improve the thermal stability of Mg–Sn alloys.