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The assessment of local lattice strains in alloys using total scattering

Accepted version
Peer-reviewed

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Abstract

The highly-strained lattice hypothesis in high-entropy alloys (HEAs) has led to an interest in local distortions created in substitutional solid-solution alloys. In this work, the use of total scattering for the assessment and analysis of local lattice strains in alloys is considered. Using two theoretical models, the variation in the width of peaks in the pair distribution function (PDF) with changes in composition, ordering and atomic radius is presented. Key practical considerations for the successful analysis of local lattice strains using this technique are discussed, with particular reference to sample preparation, instrumental and data processing effects. Further, the mitigation of errors in local-strain measurements caused by differences in the scattering length of constituent atoms is presented. This is concluded with a proposed methodology for the analysis of local strains using this technique

Description

Keywords

Total scattering, Diffraction, Pair correlation function, Lattice strains

Journal Title

Acta Materialia

Conference Name

Journal ISSN

1359-6454
1873-2453

Volume Title

170

Publisher

Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/H022309/1)
Engineering and Physical Sciences Research Council (EP/M005607/1)
EPSRC (1369206)
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