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Lattice distortions in high-entropy alloys

Published online by Cambridge University Press:  12 October 2018

Lewis Robert Owen  and
Nicholas Gwilym Jones
Lewis Robert Owen
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, U.K.
Nicholas Gwilym Jones*
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, U.K.
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

One of the founding concepts of the high-entropy alloy (HEA) field was that the lattice structures of multicomponent solid solution phases are highly distorted. The displacement of the constituent atoms, away from their ideal locations (local lattice strain), has been widely cited as the reason for a number of the observed physical and mechanical properties. However, very little data directly characterizing these lattice distortions exist and, thus, the validity of this hypothesis remains an open question. Here, the concept is reviewed by considering the underlying principles of the lattice distortions, the suitability of different assessment methods, and the direct experimental data currently available. It is found that, at present, there is no clear evidence that the lattice distortions in HEAs are significantly greater than those of conventional alloys. However, so few alloys have been appropriately characterized that this conclusion cannot be considered overarching and further research is required.

Keywords

high-entropy alloyslocal lattice strainscattering techniquescrystallographic structure
Type
Invited Review
Information
Journal of Materials Research , Volume 33 , Issue 19: Focus Issue: Fundamental Understanding and Applications of High-Entropy Alloys , 14 October 2018 , pp. 2954 - 2969
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

This section of Journal of Materials Research is reserved for papers that are reviews of literature in a given area.

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