Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23272
Title: Entropy-driven phase stability and slow diffusion kinetics in an Al 0.5CoCrCuFeNi high entropy alloy
Authors: Ng, C
Guo, S
Luan, J
Shi, S 
Liu, CT
Keywords: Thermal stability
Thermomechanical treatment
Phase stability, prediction
Issue Date: 2012
Publisher: Elsevier
Source: Intermetallics, 2012, v. 31, p. 165-172 How to cite?
Journal: Intermetallics 
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 Al 0.5CoCrCuFeNi 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.
URI: http://hdl.handle.net/10397/23272
ISSN: 0966-9795
EISSN: 1879-0216
DOI: 10.1016/j.intermet.2012.07.001
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