Kinetic Monte Carlo Simulation of Clustering in an Al-Mg-Si-Cu Alloy

Materials

Bin Yang¹  Qilu Ye¹  Jianxin Wu¹  Jiqing Zhao²  Gang Yang² 

[1] Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China;

关键词: aluminum alloy;    Kinetic Monte Carlo;    reversion;    aging;    activation energy;   

DOI  :  10.3390/ma14164523

来源: DOAJ

【 摘 要 】

The mechanism of the clustering in Al-Mg-Si-Cu alloys has been a long-standing controversial issue. Here, for the first time, the mechanism of the clustering in the alloy was investigated by a Kinetic Monte Carlo (KMC) approach. In addition, reversion aging (RA) was carried out to evaluate the simulation results. The results showed that many small-size clusters formed rapidly in the early stages of aging. With the prolongation of aging time, the clusters merged and grew. The small clusters formed at the beginning of aging in Al-Mg-Si-Cu alloy were caused by initial vacancies (quenching vacancies). The merging and decomposition of the clusters were mainly caused by the capturing of vacancies, and the clusters had a probability to decompose before reaching a stable size. After repeated merging and decomposition, the clusters reach stability. During RA, the complex interaction between the cluster merging and decomposition leaded to the partial irregular change of the hardness reduction and activation energy.

【 授权许可】

Unknown