Abstract The effect of Al content on the microstructure, damping behavior and mechanical properties of Mg-xAl-0.5Ce (wt%) damping alloys was systematically studied. Al content had a great effect on the morphology features of Al 4 Ce phases. The quasi-rectangular network structure was observed in as-cast Mg-1Al-0.5Ce alloy. The Al addition promoted the dynamic recrystallization during extrusion process and led to the texture weakening, but the basal texture was sharpened with further Al addition due to the consumption of the Ce solute. The as-extruded Mg-1Al-0.5Ce alloy showed the best damping capacity among as-extruded Mg-xAl-0.5Ce alloys, which was mainly ascribed to the texture weakening. The ductility was improved with increasing Al content, while the strength was reduced. This behavior was related with the texture weakening and increasing grain sizes. The as-extruded Mg-1Al-0.5Ce alloy exhibited the excellent comprehensive performance. The peak P 2 of as-extruded alloys in the first heating run was a superimposed peak, consisting of a grain boundary relaxation peak and a recrystallization peak. The grain boundary peaks P 2 in the second heating run shifted to lower temperatures and their activation energies decreased with increasing Al content. The reasons for the variation of the grain boundary peak P 2 were discussed.

中文翻译：

---

新型 Mg-xAl-0.5Ce (wt.%) 阻尼合金的显微组织演变、阻尼能力和机械性能

摘要 系统研究了Al含量对Mg-xAl-0.5Ce(wt%)阻尼合金组织、阻尼行为和力学性能的影响。Al含量对Al 4 Ce相的形貌特征有很大影响。在铸态 Mg-1Al-0.5Ce 合金中观察到准矩形网络结构。Al的添加促进了挤压过程中的动态再结晶并导致织构减弱，但由于Ce溶质的消耗，进一步添加Al使基础织构变得尖锐。挤压态 Mg-1Al-0.5Ce 合金在挤压态 Mg-xAl-0.5Ce 合金中表现出最好的阻尼能力，这主要归因于织构弱化。随着Al含量的增加，延展性提高，而强度降低。这种行为与织构减弱和晶粒尺寸增加有关。挤压态Mg-1Al-0.5Ce合金表现出优异的综合性能。在第一次加热过程中，挤压态合金的峰 P 2 是一个叠加峰，由晶界弛豫峰和再结晶峰组成。第二次加热过程中的晶界峰 P2 转移到较低的温度，它们的活化能随着 Al 含量的增加而降低。讨论了晶界峰P 2 变化的原因。第二次加热过程中的晶界峰 P2 转移到较低的温度，它们的活化能随着 Al 含量的增加而降低。讨论了晶界峰P 2 变化的原因。第二次加热过程中的晶界峰 P2 转移到较低的温度，它们的活化能随着 Al 含量的增加而降低。讨论了晶界峰P 2 变化的原因。