Investigation on the σ-phase-related equilibria in Cr-Mn-Co system

Haoge Li, Jingjing Ruan, Nobufumi Ueshima, Katsunari Oikawa

Research output: Contribution to journalArticlepeer-review

Abstract

The equilibrated microstructures in the Cr-Mn-Co ternary alloys annealed at 900, 1050, 1150, and 1200 °C were studied using X-ray diffraction (XRD) and electron probe micro analyzer (EPMA). The results are summarized as follows: (1) the σ phase has a wide solubility range from Cr-Co side to Cr-Mn side at all temperatures investigated; (2) the σ phase region becomes narrower as the temperature increases from 900 to 1200 ℃; (3) The (αCo) phase has a significant solubility for Cr which decreases with increasing Mn content; (4) the solubility of Co in the (Cr) phase decreases with the increasing Mn content at all temperatures investigated; (5) the solubility of Cr in the (βMn) phase slightly increases as the temperature increases from 900 to 1150 ℃, while the solubility of Co changes hardly. The experimental information obtained from this study is not only useful for the thermodynamic assessment of the Cr-Mn-Co ternary system, but also significant for the alloy design of high entropy alloy.

Original languageEnglish
Article number159024
JournalJournal of Alloys and Compounds
Volume867
DOIs
Publication statusPublished - 2021 Jun 25

Keywords

  • High entropy alloy
  • Isothermal sections
  • Microstructure
  • Phase diagrams

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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