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Updated: Feb 5, 2026

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
Published on: May 29, 2018
High-entropy alloy strengthened by in situ formation of entropy-stabilized nano-dispersoids
Bharat Gwalani1, Rizaldy M Pohan2, Junho Lee2
1Department of Materials Science and Engineering, University of North Texas, 1155 Union Circle, Denton, TX, 76203, USA.
Abstract:
A significant increase in compressive yield strength of the Al0.3CoCrFeMnNi high-entropy alloy (HEA) from 979 MPa to 1759 MPa was observed upon the introduction of 3 vol.% Y2O3. The HEAs were processed using spark plasma sintering of mechanically alloyed powders. Transmission electron microscopy and atom probe tomography confirmed the presence of compositionally complex nano-dispersoids in the Y2O3-added HEA. The significant increase in strength can be attributed to the nano-dispersoid strengthening coupled with grain refinement. Therefore, the in-situ formation of the compositionally complex nanoscale dispersoids during the alloy processing could be a novel approach to create entropy-stabilized oxide particles in strengthening of HEAs.
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