期刊
ACTA MATERIALIA
卷 170, 期 -, 页码 38-49出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2019.02.038
关键词
Total scattering; Diffraction; Pair correlation function; Lattice strains
资金
- STFC ISIS Facility
- Rolls-Royce/EPSRC Strategic Partnership [EP/H022309/1, EP/M005607/1]
- Gonville and Caius College
- EPSRC [EP/M005607/1] Funding Source: UKRI
The highly-strained lattice hypothesis in high-entropy alloys (HEM) 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. (C) 2019 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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