|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||P39: Atomistic Calculations of the Peierls Stress in NbTiZr Multi-principal Element Alloys
||Yanqing Su, Emily Hwang, Jun Xu, Shuozhi Xu, Irene J. Beyerlein
|On-Site Speaker (Planned)
The Peierls stress is the minimum resolved shear stress required to translate a dislocation in a crystal. In an otherwise perfect crystal, the Peierls stress is closely related to the critical resolved shear stress. Thus, Peierls stress is usually considered one of the most important factors controlling plastic deformation of metals. Compared with pure metals, the Peierls stress in metallic alloys is less explored. In this work, we study the Peierls stress in one type of metallic alloys, the multi-principal element alloys (MPEAs), which received significant attention in recent years. Using atomistic simulations, we calculate the Peierls stresses on different slip planes in body-centered cubic (BCC) NbTiZr MPEAs. BCC Nb is also studied as a reference. Our calculations reveal a significant spatial variation of the Peierls stress as a result of the local chemical composition fluctuations in MPEAs.