Journal
SCRIPTA MATERIALIA
Volume 131, Issue -, Pages 59-62Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.01.006
Keywords
Expanded austenite; Crystal structure; Plastic deformation; Nitriding; X-ray diffraction (XRD)
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Funding
- Danish Council for Independent Research (DFF) [11-106293]
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No consistent structural description exists for expanded austenite that accurately accounts for the hkl-dependent peak shifts and broadening observed in diffraction experiments. The best available description for homogeneous samples is a face-centered cubic lattice with stacking faults. Here Debye simulations of stacking fault effects were compared to experimental data for macro-stress free homogeneous expanded austenite to show that a faulted structure cannot explain the observed peak displacement anomalies. Instead it is argued that the shifts are the combined result of elastic and plastic anisotropy leading to (strongly) non-linear hk/-dependent elastic behavior during composition-induced plastic deformation on synthesis of expanded austenite. (C) 2017 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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