Deviation from high-entropy configurations in the atomic distributions of a multi-principal-element alloy

Louis J. Santodonato (), Yang Zhang (), Mikhail Feygenson, Chad M. Parish, Michael C. Gao, Richard J.K. Weber, Joerg C Neuefeind, Zhi Tang and Peter K Liaw ()
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Louis J. Santodonato: Oak Ridge National Laboratory
Yang Zhang: Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign
Mikhail Feygenson: Oak Ridge National Laboratory
Chad M. Parish: Oak Ridge National Laboratory
Michael C. Gao: National Energy Technology Laboratory
Richard J.K. Weber: Materials Development Inc.
Joerg C Neuefeind: Oak Ridge National Laboratory
Zhi Tang: The University of Tennessee
Peter K Liaw: The University of Tennessee

Nature Communications, 2015, vol. 6, issue 1, 1-13

Abstract: Abstract The alloy-design strategy of combining multiple elements in near-equimolar ratios has shown great potential for producing exceptional engineering materials, often known as ‘high-entropy alloys’. Understanding the elemental distribution, and, thus, the evolution of the configurational entropy during solidification, is undertaken in the present study using the Al1.3CoCrCuFeNi model alloy. Here we show that, even when the material undergoes elemental segregation, precipitation, chemical ordering and spinodal decomposition, a significant amount of disorder remains, due to the distributions of multiple elements in the major phases. The results suggest that the high-entropy alloy-design strategy may be applied to a wide range of complex materials, and should not be limited to the goal of creating single-phase solid solutions.

Date: 2015
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DOI: 10.1038/ncomms6964

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