Oxidation behaviors and mechanical properties of L12-strengthened high-entropy alloys at 700 ℃

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

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Author(s)

  • Wu Kai
  • Jinxiong Hou
  • Qian Li
  • Chin-hua Yang

Detail(s)

Original languageEnglish
Article number110499
Journal / PublicationCorrosion Science
Volume206
Online published16 Jul 2022
Publication statusPublished - Sep 2022

Abstract

Oxidation behavior and mechanical properties of two L12-strengthened high-entropy superalloys (HESAs), i.e., (Ni2Co2FeCr)92Ti4Al4 and (Ni2Co2FeCr)92Nb4Al4, were systematically investigated at 700 ℃. Our results reveal that the oxidation resistance was significantly improved by the replacement of Ti with Nb with slightly optimized mechanical performance. The substitution of Ti by Nb promotes the formation of continuous Cr2O3, AlNbO4, and Al2O3 layers, and causes a remarkable improvement in oxidation resistance, thus highlighting the greater potential of Nb-bearing HESAs to function as the elevated-temperature structural materials. The underlying mechanisms for the superior mechanical properties and oxidation resistance of the Nb-bearing HESA were carefully discussed.

Research Area(s)

  • L1 2-strengthened high -entropy alloy, Oxidation behavior, Mechanical properties, Titanium, Niobium, HIGH-TEMPERATURE OXIDATION, DELTA-PHASE PRECIPITATION, TENSILE PROPERTIES, AIR-OXIDATION, EMBRITTLEMENT, DEFORMATION, NB