Effect of Initial Microstructure Conditions on the Microstructure and Mechanical Properties of Hot Extruded Mg-6Nd-2Al Alloy.

In the present paper, the effect of initial microstructure on the hot extruded Mg-6Nd-2Al alloy was carried out by microstructural observation and mechanical property testing. The results show that there are short rod-shaped Al₁₁Nd₃ phase, strip-shaped Mg₁₂Nd phase and granular Al₂Nd phase in the as-cast Mg-6Nd-2Al alloy after hot extrusion. The as-cast alloy is treated by solid solution and then hot extrusion, the granular Al₂Nd phase can still be observed in the alloy, and the needle-shaped Al₂Nd phase precipitates inside the α-Mg matrix. A typical (0001) texture and {01-10} prismatic surface texture appear in the as-cast alloy after hot extrusion, while in the solid-solution alloy after hot extrusion does not form an obvious preferred orientation. The ultimate tensile strength and the yield strength of the as-cast alloy after hot extrusion are higher, which are 271.2MPa and 247.8MPa, respectively. However, the elongation of the as-cast alloy after hot extrusion is lower, which is 15.3%. [ABSTRACT FROM AUTHOR]