|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Chemical Short-range Orders and the Induced Structural Transition in High Entropy Alloys
||Qing Wang, Yue Ma, Xiaona Li, Chuang Dong, Peter K. Liaw
|On-Site Speaker (Planned)
The chemical short-range orders (CSROs) of high entropy alloys (HEAs) play an important role to the structural transition and advanced properties. However, it is difficult to describe the CSROs with local atomic structures. The present work introduces a cluster-plus-glue-atom model to understand the CSROs of Al-Ni-Co-Fe-Cr HEAs. Two HEAs of Al2M14 are designed, which is derived from two cluster models of [Al-M12](M2Al1) in FCC and [Al-M14]Al1 in BCC. M = Ni4Co4Fe3Cr3 renders the HEA with a FCC structure, while the matrix will be transformed into a BCC structure when M = Ni1Co1Fe2Cr1. These two cluster models are then used to simulate the PDFs at short distances. The calculated PDFs by cluster models can fit better with the experimental PDFs by neutron scattering than that by average structures, indicating the existence of CSROs in HEAs. This cluster model would be developed into a new alloy design strategy for high-performance HEAs.
||Planned: Supplemental Proceedings volume