|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Controlling Short-Range Ordering to Simultaneously Enhance Strength and Ductility of High-Entropy Alloys
||Shuai Chen, Zachary Aitken, Subrahmanyam Pattamatta, Zhaoxuan Wu, Zhigen Yu, David J Srolovitz, Peter K Liaw, Yong-Wei Zhang
|On-Site Speaker (Planned)
We investigate two high-entropy alloys (HEAs), CoCuFeNiPd and CoCuFeNiTi, using a combination of Monte Carlo (MC) and molecular dynamic (MD) simulations. Our results show that CoCuFeNiPd exhibits much stronger short-range ordering (SRO) than CoCuFeNiTi. We find that it is the chemical-affinity disparity and exclusivity between Ti (Pd) with the remaining species that lead to the different SRO in these two HEAs. We also investigate the mechanical properties of CoCuFeNiPd HEA under different stages of SRO. Our results show that the SRO leads to a composite microstructure, consisting of three categories of clusters: low-energy clusters, medium-energy clusters, and high-energy clusters, with the medium-energy clusters playing the role as the matrix, the low-energy clusters serving as hard fillers to enhance the strength, while high-energy clusters acting as soft fillers to increase the ductility, resulting in the simultaneous increase in ultimate strength and ductility.
||Computational Materials Science & Engineering, High-Entropy Alloys, Composites