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%.

本文通过显微组织观察和力学性能测试研究了初始显微组织对热挤压Mg-6Nd-2Al合金的影响。结果表明，热挤压后的铸态Mg-6Nd-2Al合金中存在短棒状Al ₁₁ Nd ₃相、条状Mg ₁₂ Nd相和粒状Al ₂ Nd相。铸态合金经固溶后热挤压处理，合金中仍可观察到粒状Al ₂ Nd相，针状Al ₂Nd 相沉淀在 α-Mg 基体中。热挤压后的铸态合金出现典型的(0001)织构和{01-10}棱柱形表面织构，而热挤压后的固溶体合金未形成明显的择优取向。热挤压后铸态合金的极限抗拉强度和屈服强度较高，分别为271.2MPa和247.8MPa。但热挤压后铸态合金的延伸率较低，为 15.3%。