Abstract
Pressure-induced polymorphism has recently been demonstrated in several high entropy alloys. This offers a new window into the much-debated issue of phase selection and stability in these systems. Here, we examine the effect of cryogenic temperatures on the pressure-induced transition from face centered cubic to hexagonal close-packed structures of the prototype CoCrFeMnNi (Cantor) alloy. We observe a reduction in the critical pressure for the onset of the polymorphic transition as the temperature decreases, confirming the progressive stabilization of the hexagonal phase with decreasing temperature previously predicted by ab initio calculations accounting for magnetic interactions. We argue that in situ high-pressure experiments at cryogenic temperatures, which suppress time-dependent transformation triggered at higher temperatures, present a unique opportunity to significantly improve our understanding of these complex alloys.
| Original language | English |
|---|---|
| Article number | 115101 |
| Journal | Journal of Applied Physics |
| Volume | 136 |
| Issue number | 11 |
| DOIs | |
| State | Published - Sep 21 2024 |
Funding
We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at beamlines P02.1 and P02.2 at PETRA III, where beamtime was allocated for Proposal Nos. I-20210528 EC and I-20230084 EC. M.G. was supported by resources at the Spallation Neutron Source and the High Flux Isotope Reactor, Department of Energy (DOE) Office of Science User Facilities operated by the Oak Ridge National Laboratory. Bala Malladi acknowledges for the EBSD analysis.