Effect of Ca Content on the Microstructure and Mechanical Properties of Hot-Extruded Mg-6Al-2Nd Alloys.

In this work, the microstructure and mechanical properties of hot-extruded Mg-6Al-2Nd-xCa (x = 0, 1.0, 2.0) alloys were investigated. The experimental results showed that the Mg-6Al-2Nd-xCa (x = 0, 1.0, 2.0) alloys were occurred partial dynamic recrystallization after hot extrusion deformation, and the grain size was refined obviously. Under the action of hot extrusion, the intermetallic phase had fractured and was streamlined along the extrusion direction. The intermetallic phase distribution was more dispersed and uniform than that of the as-cast alloy. At room temperature, 175, 200, 225 and 250 °C, the ultimate tensile strength and yield strength of the hot-extruded alloys increased significantly with increasing Ca content, respectively. The ultimate tensile strength of hot-extruded Mg-6Al-2Nd-xCa (x = 0, 1.0, 2.0) alloys at room temperature and 250 °C was 269.0, 270.8, 289.3 and 66.1, 73.8, 77.8 MPa, respectively. In addition, the hot-extruded Mg-6Al-2Nd-xCa alloys exhibited good plasticity at high temperature deformation. The elongations of hot-extruded Mg-6Al-2Nd-xCa (x = 0, 1.0, 2.0) alloys at 250 °C were 75.0, 72.9 and 69.5%, respectively. [ABSTRACT FROM AUTHOR]