Dynamic recrystallization in biomedical Co-29Cr-6Mo-0.16N alloy with low stacking fault energy

Yunping Li, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Dynamic recrystallization (DRX) behaviors of biomedical Co-29Cr-6Mo-0.16N (CCMN) alloy were analyzed in detail in hot compressive tests. At low temperature (≤1050 °C) and low strain rate (≤1 s-1), DRXed grains preferentially nucleate along pre-existing grain boundaries or σ3n boundaries, with a result of necklace microstructure broadening with increasing strain; while at higher temperature and/or higher strain rate, DRX occurs uniformly in matrix resulting in homogenous and texture-free fine grained microstructure. These two kinds of DRXed microstructures formed in CCMN alloy are related the repeated formation of annealing twin during hot deformation, which was determined by both the temperature and the activity of stacking fault formation. It was also found that the σ3n boundaries formed at lower strain level will evolve into general high angle grain boundaries (HAGB) with further straining. A schematic model for DRX mechanism of CCMN alloy was proposed with respect to temperature, strain rate, and strain.

Original languageEnglish
Pages (from-to)86-96
Number of pages11
JournalMaterials Science and Engineering A
Volume668
DOIs
Publication statusPublished - 2016 Jun 21

Keywords

  • Annealing twinning
  • Co-29Cr-6Mo-0.16N alloy
  • Dynamic recrystallization
  • EBSD
  • Stacking fault

ASJC Scopus subject areas

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

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