Microstructural Impacts on the Oxidation of Multi-Principal Element Alloys

• DOI: 10.1007/s11085-024-10225-2
• Publication Date: 2024-02-16T18:02:16Z
• Authors: Michael J. Pavel; Mark L. Weaver
• Keywords: Isothermal process; Thermogravimetric analysis

The impacts of thermal treatment on the precipitate morphology and oxidation behavior a dual-phase (FCC + L12) multi-principal element alloy (MPEA), Ni45Co17Cr14Fe12Al7Ti5, was studied at 1000 °C via isothermal cyclic testing. Thermogravimetric analysis subsequent characterization revealed that smaller precipitates had an increased capacity to form protective sub-surface oxide layers which mitigated total mass gain. smaller-precipitate-containing samples exhibited decrease in thickness primary Cr2O3 scale parabolic growth rate. Mechanistically this is believed stem from rate initial Al2O3 nuclei decreased inter-precipitate spacing results faster lateral diffusion agglomeration.