|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-128: Stress Corrosion Cracking Mechanism of FCC Type High-entropy Alloys Structural Materials under High Temperature Pressurized Water Environment by Molecular Dynamics Simulation
||Chang Liu, Qian Chen, Yang Wang, Narumasa Miyazaki, Yusuke Ootani, Nobuki Ozawa, Momoji Kubo
|On-Site Speaker (Planned)
For the practical use of FCC type high-entropy alloy (HEA) with excellent high-temperature strength, it is required to obtain principles on how to prevent stress corrosion cracking. Consequently, it is important to elucidate the mechanism in corrosion and the intergranular fracture process of HEA caused by stress in high temperature pressurized water environment. For this purpose, here the tensile simulation was performed on the grain boundary model of FCC type HEA in vacuum and water environment by reactive molecular dynamics method. In vacuum environment, the stacking faults via a structural transformation from FCC to HCP were generated from the grain boundaries and surfaces. However, in water environment, the stacking faults were suppressed because the HEA surface was oxidized by water, and a change from the FCC to the BCC structure was observed instead. This behavior differs from the pure metal like nickel, showing the unique stress corrosion cracking mechanism.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume