A combinatorial evaluation of TiZrV0.5Nb0.5Six refractory high entropy alloys: Microstructure, mechanical properties, wear and oxidation behaviors

Xuhui Pei, Yin Du, Tao Li, Hanming Wang, Mingchuan Hu, Haifeng Wang

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

In this work, TiZrV0.5Nb0.5Six (x = 0.1, 0.2, 0.3) refractory high entropy alloys was used as a candidate system to comprehensively evaluate the relationship between microstructure, mechanical properties and elevated temperatures service performance. With the increasing Si addition, there is a transition from a single-phase BCC to a dual-phase comprising BCC and silicide phases in the microstructure, accompanied with an increasing microhardness/strength. Meanwhile, both wear and oxidation resistance over a wide temperature range were simultaneously improved. The formation of strong silicide phase has a significant effect on inhibiting the cracking of the oxide layer and hindering the volatilization of oxides, which makes the Si-containing refractory high entropy alloys have excellent oxidation resistance at high temperature. Moreover, the improvement of wear resistance could be attributed to the synergistic effect of mechanical properties and oxidation resistance. At medium and low temperatures, the adhesion wear was restrained by the enhanced microhardness and softening-resistance. The formation of dense glaze layer at elevated temperatures enables a low coefficient of friction and a low wear rate. The present results offer considerable insights into the design of refractory high entropy alloys for service in harsh environments.

Original languageEnglish
Article number112956
JournalMaterials Characterization
Volume201
DOIs
StatePublished - Jul 2023

Keywords

  • Elevated temperature
  • Refractory high entropy alloys
  • Service performance
  • Silicide phase

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