Synergistic effects of Al and Ti on the oxidation behaviour and mechanical properties of L12-strengthened FeCoCrNi high-entropy alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number109365
Journal / PublicationCorrosion Science
Volume184
Online published3 Mar 2021
Publication statusPublished - 15 May 2021

Abstract

Synergistic effects of Al and Ti on the oxidation behaviour and mechanical properties of FeCoCrNi high-entropy alloys were systematically investigated. Our results reveal that increasing the Al/Ti ratio slows down the oxidation kinetics at 700−900 °C and changes the oxide scale from TiO2 and spinel oxides to Cr2O3 and Al2O3, leading to a substantial improvement of oxidation resistance. From a mechanical aspect, however, increasing the Al/Ti ratio decreases the mechanical strength, demonstrating a strong trade-off between oxidation resistance and mechanical properties. The underlying mechanisms for the Al and Ti effects on the oxidation resistance and mechanical properties were discussed.

Research Area(s)

  • A. High-entropy alloy, C. Mechanical property, C. Oxidation, C. Oxide scale microstructure, C. Precipitate