Microstructure refinement of a transformation-induced plasticity high-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

High-entropy alloys (HEAs) have attracted extensive interest due to their unprecedented structure and mechanical performance. We recently proposed a series of novel corich twinning induced plasticity (TWIP) and transformation induced plasticity (TRIP) HEAs with superior tensile properties at room temperature; however, the hot deformation behavior has not been reported. Here, we investigated the dynamic recrystallization behavior and grain refinement of a representative TRIP-HEA, compressed at temperatures of 1123–1273 K with strain rates of 0.1–0.001 s−1. We characterized the impact of the temperature and strain rate on the grain structure evolution. A constitutive equation was constructed to reveal the correlations between the flow stress, strain rate, temperature, and strain. The apparent activation energy was estimated to be ~385.7 kJ/mol. The discontinuous dynamic recrystallization played an important role in the grain refinement, particularly at a relatively higher temperature and a lower strain rate, and the volume fraction and morphology of the recrystallized grains exhibited a strong dependency on the Zener–Hollomon parameter. The study provides guidelines for the grain refinement of HEAs through thermomechanical processing.

Original languageEnglish
Article number1196
Pages (from-to)1-14
Number of pages14
JournalMaterials
Volume14
Issue number5
DOIs
Publication statusPublished - 2021 Mar 1

Keywords

  • Constitutive equation
  • Dynamic recrystallization
  • High-entropy alloy
  • Hot deformation
  • Mi-crostructure

ASJC Scopus subject areas

  • Materials Science(all)

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