Modelling the spatial evolution of excess vacancies and its influence on age hardening behaviors in multicomponent aluminium alloys

• DOI: 10.1016/j.actamat.2023.119552
• Publication Date: 2023-11-26T13:38:53Z
• Authors: Xuezhou Wang; Dongdong Zhao; Yijiang Xu; Yanjun Li
• Keywords: Precipitation hardening; Hardening (computing); Annihilation

Excess vacancies play crucial roles in the precipitation of age-hardening precipitates aluminium alloys, but their spatial evolution across grains during heat treatments is less known. In this work, a numerical model developed to predict non-equilibrium excess cooling from solution treatment and ageing multicomponent alloys. A finite volume scheme applied derive distribution vacancy site fraction by solving diffusion equations under influence solute elements. Binding energies between atoms predicted first-principles calculations has been used handle trapping atom clusters. The annihilation rates at grain boundaries dislocation jogs have derived based on rigorous description mechanisms vacancies. density due taken into account. successfully interpret age hardening behaviors experimental alloys subjected different thermomechanical processing conditions. This will help reach deeper understanding kinetics therefore important further optimize parameters alloy composition improve macroscopic mechanical properties