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针对挤压态以及经过固溶+人工时效(T6)处理的挤压变形Al-0.8Mg-0.6Si-xEr合金的显微组织和拉伸性能进行了研究。结果表明,适量Er的加入,可以细化挤压态Al-0.8Mg-0.6Si-xEr合金的组织,其中当Er含量为0.3%时,细化效果最明显,且挤压态Al-0.8Mg-0.6Si-xEr合金的抗拉强度和屈服强度最高。经过T6处理后,含Er合金的显微组织与挤压态合金相比有一定程度的粗化,但挤压变形Al-0.8Mg-0.6Si-xEr合金的抗拉强度和屈服强度显著提高,这是由于合金在T6处理后析出了弥散的次生Al3Er第二相粒子。拉伸断口分析表明,挤压态Al-0.8Mg-0.6Si-xEr合金发生典型的韧性断裂,而经过T6处理后Al-0.8Mg-0.6Si-xEr合金则发生以韧性断裂为主的韧脆混合断裂。
The microstructures and tensile properties of extruded Al-0.8Mg-0.6Si-xEr alloys treated by solution treatment and aging treatment (T6) were studied. The results show that the proper addition of Er can refine the microstructure of the as-extruded Al-0.8Mg-0.6Si-xEr alloy. When the content of Er is 0.3%, the refining effect is the most obvious. The extruded Al-0.8Mg -0.6Si-xEr alloy has the highest tensile strength and yield strength. After T6 treatment, the microstructure of the Er-containing alloy is coarser than that of the extruded alloy, but the tensile strength and yield strength of the extruded Al-0.8Mg-0.6Si-xEr alloy increase significantly, This is due to the precipitation of the dispersed secondary Al3Er second-phase particles after T6 treatment. Tensile fracture analysis shows that the typical ductile fracture occurs in the as-extruded Al-0.8Mg-0.6Si-xEr alloy and the ductile fracture mainly occurs in the Al-0.8Mg-0.6Si-xEr alloy after T6 treatment Mixed fracture.