A strategy for enhancing the mechanical property of the precipitation-strengthened medium-entropy alloy

Hai Long Yi, Daixiu Wei, Ren Yi Xie, Yi Fan Zhang, Hidemi Kato

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Medium-entropy alloys strengthened by the L12-type coherent precipitates were recently proposed, whereas the mechanical property still needs to be improved. Here, we demonstrated a strategy for notably improving the strength of the representative (CoCrNi)94Ti3Al3 alloy, in which the refinement of grain structures and the promotion of precipitation were concurrently achieved by pre-strain followed by aging. A refined grain structure containing incoherent σ-precipitates and a large number of coherent L12-precipitates was formed, which enhances the yield strength and ultimate tensile strength up to 1431 MPa and 1683 MPa respectively. Furthermore, decreasing pre-strain temperature or increasing strain further aids the enhancement. The present study opens an avenue for fabricating high-performance precipitation-strengthened alloys.

Original languageEnglish
Article number141390
JournalMaterials Science and Engineering A
Volume819
DOIs
Publication statusPublished - 2021 Jul 5

Keywords

  • Annealing
  • Mechanical property
  • Medium-entropy alloy
  • Pre-straining
  • Precipitation
  • Ultrafine structure

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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