Entropy-driven phase stability and slow diffusion kinetics in an Al 0.5CoCrCuFeNi high entropy alloy

Chun Ng, Sheng Guo, Junhua Luan, San-Qiang Shi, C. T. Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

160 Citations (Scopus)

Abstract

Previous work on the stability of the solid solution phases in the high entropy alloys is inconclusive. We used a series of thermo-mechanical treatments to study the stability of the solid solution phases in a high-entropy Al0.5CoCrCuFeNi alloy. The solid solution phases were found to be stable, against the intermetallic compounds, at high temperatures >850 °C and at low temperatures <300 °C. At intermediate temperatures, however, the intermetallic σ-phase co-existed with the solid solution phases. The experimental observations were verified by the thermodynamic calculation results. The mechanisms for the phase stability, both at equilibrium and after quenching-equivalent annealing treatments, were discussed, and the roles of high entropy and slow diffusion kinetics were highlighted.
Original languageEnglish
Pages (from-to)165-172
Number of pages8
JournalIntermetallics
Volume31
DOIs
Publication statusPublished - 1 Dec 2012

Keywords

  • B. Thermal stability
  • C. Thermomechanical treatment
  • E. Phase stability, prediction

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys
  • Chemistry(all)

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