Microstructural and Texture Evolution of Hot-Rolled TA32 Alloy and Its Effect on Tensile Properties

Abstract

A challenge for the research and industrial community is to develop lightweight wrought Mg-based alloys that exhibit high strength and good ductility. To address this challenge, Mg-3Sn-2Al (TA32) alloy was produced by the squeeze casting process followed by hot rolling (HR). To improve its ductility, the hot-rolled alloy was annealed (HRA). HR and HRA samples were subjected to microstructural, composition, textural, and mechanical property analysis. The HR sheet exhibited high strength with 0.2% proof stress (PS) of 274 MPa and ultimate tensile strength (UTS) of 390 MPa, as well as reasonable ductility (12%) along the rolling direction, one of the highest values for Mg alloys. HRA sheet showed a moderate reduction in strength with a 0.2% PS of 250 MPa and UTS of 365 MPa, but an improvement in ductility (19%). The excellent properties of this alloy can be attributed to the synergistic effects of grain refinement, solid-solution strengthening by Al and Sn atoms, and uniform distribution of fine Mg2Sn particles.