Chemical domain structure and its formation kinetics in CrCoNi medium-entropy alloy

作者：Jun-Ping Du, Peijun Yu, Shuhei Shinzato, Fan-Shun Meng, Yuji Sato, Yangen Li, Yiwen Fan, Shigenobu Ogata · 发表于：Acta Materialia · 年份：2022 · DOI：10.1016/j.actamat.2022.118314 · 被引用次数：69 · 研究领域：High Entropy Alloys Studies、High-Temperature Coating Behaviors、Advanced Materials Characterization Techniques

The formation of local chemical order in medium-entropy alloys and high-entropy alloys (MEAs/HEAs) has been strongly suggested in recent experimental observations. Since chemical order can lead to changes in mechanical and functional properties, tailoring of chemical order is a promising approach for further improving those properties of MEAs and HEAs. However, details remain unclear regarding the atomic structure of the chemical order and the formation kinetics. Here, employing a large-scale Monte Carlo/molecular dynamics hybrid annealing simulation with a neural network potential, we find a chemical-domain structure (CDS) after annealing below 800 K in FCC CrCoNi MEA. In addition, the formation kinetics, such as the formation time and process and time–temperature–chemical-order diagrams of the CDS, were successfully obtained using a kinetic Monte Carlo simulation with artificial neural network acceleration. The findings provide key information for controlling chemical order via thermal processing.