High-temperature ultra-strength of dual-phase Re0.5MoNbW(TaC)0.5 high-entropy alloy matrix composite

Qinqin Wei, Guoqiang Luo, Rong Tu, Jian Zhang, Qiang Shen, Yujie Cui, Yunwei Gui, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

Abstract

The dual-phase Re0.5MoNbW(TaC)0.5 composite, consisting of refractory body-centered cubic (BCC) high-entropy alloy and carbide with many fine eutectic structures, was successfully synthesized by arc melting. The phase stability, high-temperature mechanical properties and strengthening mechanism of the as-cast composite were studied. The microstructure of the composite remained stable after annealing at 1300℃ for 168h. It exhibited remarkably high-temperature strength, yield strength ∼ 901 MPa, and true ultimate compressive strength ∼ 1186 MPa at 1200℃. The BCC phase and carbide exhibited a semi-coherent interface with good bonding after severe deformation at 1200℃. The dipolar dislocation walls in BCC phase, restricted dynamic interaction between defects in carbide, and the pinning effect of semi-coherent interface offered effective strengthening effects.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Materials Science and Technology
Volume84
DOIs
Publication statusPublished - 2021 Sep 10

Keywords

  • Composite
  • Eutectic structure
  • High-entropy alloy
  • Strength
  • Strengthening mechanism

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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