For (CoCrFeMn)100−xAlx high-entropy alloys, we investigate the phase evolution with increasing Al-content (0 ≤ x ≤ 20 at.%). From first-principles theory, the Al-doping drives the alloy structurally from FCC to BCC separated by a narrow two-phase region (FCC+BCC), which is well supported by our experiments. We highlight the effect of Al-doping on the formation enthalpy and electronic structure of (CoCrFeMn)100−xAlx alloys. As chemical short-range order (SRO) in multicomponent alloys indicates the nascent local order (and entropy changes), as well as expected low-temperature ordering behavior, we use thermodynamic linear-response within density-functional theory to predict SRO and ordering transformation and temperatures inherent in (CoCrFeMn)100−xAlx. The predictions agree with our present experimental findings, and other reported ones.
@article{arxiv.1803.06771,
title = {Tuning phase-stability and short-range order through Al-doping in (CoCrFeMn)100-xAlx high entropy alloys},
author = {Prashant Singh and Amalraj Marshal and Andrei V. Smirnov and Aayush Sharma and Ganesh Balasubramanian and K. G. Pradeep and Duane D. Johnson},
journal= {arXiv preprint arXiv:1803.06771},
year = {2019}
}