GPa level pressure-induced phase transitions and enhanced corrosion resistance of AlCrMoSiTi high-entropy alloys

This study aims to comprehensively determine the influence of high pressure on the microstructure and corrosion properties of a designed high-entropy alloy (Al3Cr2Mo2SiTi2). By characterizing the microstructure and morphology of the alloy, we have confirmed that the intermetallic compound volume fraction decreases and the peritectic reaction occurs during the solidification process of the alloy under 4 GPa. Moreover, the intermetallic compound phase A1 changes from (Ti, Mo)5Si3 (K1 phase) at ambient pressure to (Ti, Mo) Si2 at 4 GPa, and the volume fraction of the Cr-rich (C1 phase) phase increases from 20% to 64%. This special transformation, induced by high pressure, significantly optimizes the corrosion resistance of the alloy.(c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).