|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Innovations in High Entropy Alloys and Bulk Metallic Glasses: An SMD & FMD Symposium in Honor of Peter K. Liaw
||Portevin-Le Chatelier Mechanism in Face-Centered-Cubic Metals from Low to High Entropy
||Che-Wei Tsai, Chi Lee, Po-Ting Lin, Xie Xie, Shuying Chen, Robert Carroll, Michael LeBlanc, Braden A. W. Brinkman, Peter K. Liaw, Karin Dahmen, Jien-Wei Yeh
|On-Site Speaker (Planned)
Portevin–Le Chatelier effect is a serration phenomenon due to diffusing solute atoms during tensile testing on metals, but its detailed mechanisms are not fully clear yet. We use a different approach to find the mechanism by tensile testing on a series of single-phase face-centered-cubic metals: Ni, CoNi, CoFeNi, CoCrFeNi, and CoCrFeMnNi, which range from low entropy to high entropy in terms of the configurational entropy. The results show that serrations occur on stress-strain curves of CoFeNi, CoCrFeNi, and CoCrFeMnNi alloys in their specific temperature and strain-rate regime. From these, we propose and demonstrate a new mechanism of dislocation pinning for the present substitutional alloys and similar substitutional alloys, which involves the in-situ local rearrangement of substitutional solute atoms by dislocation-core diffusion.
||Planned: Supplemental Proceedings volume