The microstructure and mechanical properties of hot-extruded Mg-5Sn-4Al-2Ce rapidly solidified alloy

The microstructure and mechanical properties of hot-extruded Mg-5Sn-4Al-2Ce alloy in the form of rapid solidification ribbons (RS-extruded TAE542) are investigated. The results show that rapid solidification causes ultra-fine a-Mg grains (250 nm) and massive dispersive Mg2Sn and Al11Ce3 particles (80-400 nm) in the rapidly solidified (RS)-extruded alloy. As a result, the yield strength and elongation of RS-extruded TAE542 alloy reached 366 MPa and 15.2%, increasing by 72 and 26%, respectively, when compared with that of hot-extruded TAE542 alloy made from a homogenised ingot (HI-extruded TAE542).