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Peak Broadening Anisotropy and the Contrast Factor in Metal Alloys / Thomas Simm

Crystals, Volume: 8, Issue: 5, Start page: 212

Swansea University Author: Simm, Thomas

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DOI (Published version): 10.3390/cryst8050212

Abstract

Diffraction peak profile analysis (DPPA) is a valuable method to understand the microstructure and defects present in a crystalline material. Peak broadening anisotropy, where broadening of a diffraction peak doesn’t change smoothly with 2θ or d-spacing, is an important aspect of these methods. Ther...

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Published in: Crystals
ISSN: 2073-4352
Published: MDPI 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa40138
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Abstract: Diffraction peak profile analysis (DPPA) is a valuable method to understand the microstructure and defects present in a crystalline material. Peak broadening anisotropy, where broadening of a diffraction peak doesn’t change smoothly with 2θ or d-spacing, is an important aspect of these methods. There are numerous approaches to take to deal with this anisotropy in metal alloys, which can be used to gain information about the dislocation types present in a sample and the amount of planar faults. However, there are problems in determining which method to use and the potential errors that can result. This is particularly the case for hexagonal close packed (HCP) alloys. There is though a distinct advantage of broadening anisotropy in that it provides a unique and potentially valuable way to develop crystal plasticity and work-hardening models. In this work we use several practical examples of the use of DPPA to highlight the issues of broadening anisotropy.
Keywords: diffraction peak profile analysis (DPPA); contrast factor; dislocations; twinning; crystal plasticity; planar faults; powder diffraction
College: College of Engineering
Issue: 5
Start Page: 212