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通过对不同含Mn量的Mg-6Al-xMn合金进行熔炼、制坯和反向挤压,研究Mn含量对Mg-6Al镁合金组织与力学性能的影响。结果表明,在试验范围内随着Mn含量的增加Mg-6Al-xMn合金凝固组织逐渐细化,β-Mg17Al12相逐渐减少,而出现Al-Mn相,晶粒大小由含Mn量0.3%(质量分数)时的137μm减小到含Mn量0.9%时的73μm,幅度降低为47%。不同含Mn量的Mg-6Al-xMn合金经400℃,12h均匀化处理后,β-Mg17Al12相消失。不同含Mn量的Mg-6Al-xMn合金经挤压后,挤压棒材的晶粒也随Mn含量的增加而逐变小;挤压棒材的抗拉强度、屈服强度和延伸率均随着Mn含量的增加先增加后降低。Mn含量为0.5%的挤压棒材抗拉强度和屈服强度最高,分别为293MPa,173MPa;Mn含量为0.7%的挤压棒材延伸率最大,达20%。
The effects of Mn content on the microstructure and mechanical properties of Mg-6Al-Mg alloy were studied by melting, billet and reverse extrusion of Mg-6Al-xMn alloys with different amounts of Mn. The results show that the solidified microstructure of Mg-6Al-xMn alloy is gradually refined and the β-Mg17Al12 phase decreases gradually with the increase of Mn content in the experimental range. However, the Al-Mn phase appears and the grain size decreases from 0.3% Fraction) was reduced to 73 μm at 0.9% Mn content and the amplitude was reduced to 47%. The Mg-6Al-xMn alloys with different contents of Mn disappeared after homogenization at 400 ℃ for 12h. After extrusion, the grain size of extruded bars varied with the increasing of Mn content. The tensile strength, yield strength and elongation of the extruded bars were The increase of Mn content first increases and then decreases. The tensile strength and yield strength of extruded bars with Mn content of 0.5% were the highest, which were 293MPa and 173MPa, respectively. The elongation of extruded bars with Mn content of 0.7% was the largest, up to 20%.