Structure and properties of ultrafine-grained CoCrFeMnNi high-entropy alloys produced by mechanical alloying and spark plasma sintering

S. H. Joo, H. Kato, M. J. Jang, J. Moon, E. B. Kim, S. J. Hong, H. S. Kim

Research output: Contribution to journalArticle

89 Citations (Scopus)

Abstract

CoCrFeMnNi high-entropy alloy (HEA) materials were fabricated using mechanical alloying (MA) and spark plasma sintering (SPS). The MA time, SPS temperature, and contaminations strongly affected the final microstructure and mechanical properties. Nanocrystal face-centered cubic (FCC) solid solution was made during MA, and the FCC phase maintained as the matrix after SPS at 900 °C and 1100 °C. However, Cr carbides were transformed near the surface due to the carbon contamination. When MA time increased, phase stability of the FCC phase was improved, and the contaminant (ZrO2) from the MA balls was also increased. Ultrafine-grained microstructure was obtained at 60 min MA and 900 °C SPS. On the other hand, the higher SPS temperature and lower levels of contamination were required to achieve tensile ductility. Irregularly distributed ZrO2particles developed bimodal microstructures.

Original languageEnglish
Pages (from-to)591-604
Number of pages14
JournalJournal of Alloys and Compounds
Volume698
DOIs
Publication statusPublished - 2017 Jan 1

Keywords

  • High entropy alloy
  • Mechanical alloying
  • Mechanical properties
  • Microstructure
  • Spark plasma sintering

ASJC Scopus subject areas

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

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