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针对AZ80镁合金采用了固溶处理+预时效+形变+时效处理的工艺路线,研究了预时效及随后的形变对其组织和性能的影响。试验结果表明,固溶处理使绝大部分Mg17Al12相溶入了α-Mg基体。形变处理后,晶粒被拉长,颗粒相或杂质沿变形方向分布,出现明显的纤维组织,晶粒内部出现了大量交错的形变孪晶。变形程度越大,加工硬化效果越显著,到30%时,硬度增长缓慢。形变前预时效增加了再结晶的形核,在形变后的时效处理过程中,发生了再结晶,形变产生的纤维组织消失,生成了等轴晶粒,形变程度越大,再结晶后的等轴晶粒越细小。再结晶软化和时效析出强化共同作用,使得AZ80镁合金的硬度比时效前略有升高。因此,形变热处理能有效地改善AZ80镁合金的组织和提高其力学性能。
For AZ80 magnesium alloy using the solution treatment + pre-aging + deformation + aging treatment process route, the pre-aging effect and the subsequent deformation of its organization and performance. The experimental results show that solution treatment dissolves most of Mg17Al12 into α-Mg matrix. After the deformation treatment, the grains are elongated, and the grain phase or impurities are distributed along the deformation direction. The obvious fibrous structure appears, and a large number of staggered deformation twins appear inside the grains. The greater the degree of deformation, the more significant hardening effect, to 30%, the slow increase in hardness. Pre-aging before deformation increases the nucleation of recrystallization. During the aging treatment after deformation, recrystallization occurs, and the fibrous tissue produced by deformation disappears and equiaxed grains are formed. The greater the degree of deformation, the more the recrystallization and the like The finer the grain of the axis. Recrystallization softening and aging precipitation hardening together, making AZ80 magnesium alloy hardness slightly higher than before aging. Therefore, the deformation heat treatment can effectively improve the microstructure and improve the mechanical properties of AZ80 magnesium alloy.