Abstract In this paper, the ultrasonic hammering treatment is applied to the lightweight entropic alloy Al80Li5Mg5Zn5Cu5, contributing to the modification of coarse microstructures and the improvement of mechanical properties. The effects of ultrasonic hammering on the microstructures and mechanical properties of Al80Li5Mg5Zn5Cu5 are elaborately studied, and the formation of sub-grains is thoroughly analyzed. Results show that the coarse dendrite structure is crushed into diffusely distributed micron-sized particles, and the grain size is refined significantly from larger than 200 μm to about5 μm, along with the formation of sub-grains during instant dynamic recovery. Microhardness and modulus of the grain-refined alloy increase by 50% and 22%, respectively, compared to the coarse-grained counterpart without ultrasonic hammering.

中文翻译：

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超声锤击 Al-Li-Mg-Zn-Cu 轻质熵合金亚晶形成

摘要 本文对Al80Li5Mg5Zn5Cu5轻质熵合金进行超声锤击处理，对粗大组织进行改性，提高力学性能。详细研究了超声锤击对Al80Li5Mg5Zn5Cu5组织和力学性能的影响，并深入分析了亚晶粒的形成。结果表明，粗大的枝晶组织被粉碎成弥散分布的微米级颗粒，晶粒尺寸从大于200 μm显着细化到5 μm左右，同时在瞬时动态恢复过程中形成亚晶粒。与未经超声锤击的粗晶粒合金相比，晶粒细化合金的显微硬度和模量分别增加了 50% 和 22%。