Yield asymmetry behaviour in Mg-Zr, Mg-Sn and Mg-Zr-Sn alloys

Abstract

This project is focused on the study of Mg-Zr, Mg-Sn and Mg-Zr-Sn alloys with the objective of overcoming the limitations of Magnesium due to its crystal structure (HCP). It was carried out through alloying of magnesium in three combinations i.e., Mg-0.3%wtZr, Mg-0.3%wtSn and Mg-0.3%wtZr-0.3%wtSn. The three alloys were prepared using vacuum stir casting at a temperature of 723 K for 4 hours followed by quenching. It was then hot rolled at a temperature of 573 K and at the strain rate of . The yield asymmetry behaviour of these three alloys was studied. Through SEM-EBSD analysis the texture and microstructure of three alloys Mg-0.3%wtZr, Mg-0.3%wtSn and Mg-0.3%wtZr-0.3%wtSn were analysed. Through STEM-HAADF imaging and the STEM-EDS line profile analysis the grain boundary segregation of Sn element was observed in ternary alloy Mg-0.3%wtZr-0.3%wtSn and consequently this alloy exhibited low yield asymmetry behaviour.