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Plasticity mechanisms in HfN at elevated and room temperature
Journal article   Open access   Peer reviewed

Plasticity mechanisms in HfN at elevated and room temperature

Katherine Vinson, Xiao-Xiang Yu, Nicholas De Leon, Christopher R. Weinberger and Gregory B. Thompson
Scientific reports, v 6(1), pp 34571-34571
06 Oct 2016
DOI: https://doi.org/10.1038/srep34571
PMID: 27708354
url
https://www.nature.com/articles/srep34571.pdfView
Published, Version of Record (VoR) Open
url
https://doi.org/10.1038/srep34571View
Published, Version of Record (VoR) Open

Abstract

Multidisciplinary Sciences Science & Technology Science & Technology - Other Topics
HfN specimens deformed via four-point bend tests at room temperature and at 2300 degrees C (similar to 0.7 T-m) showed increased plasticity response with temperature. Dynamic diffraction via transmission electron microscopy (TEM) revealed < 110 > {111} as the primary slip system in both temperature regimes and < 110 > {110} to be a secondary slip system activated at elevated temperature. Dislocation line lengths changed from a primarily linear to a curved morphology with increasing temperature suggestive of increased dislocation mobility being responsible for the brittle to ductile temperature transition. First principle generalized stacking fault energy calculations revealed an intrinsic stacking fault (ISF) along < 112 > {111}, which is the partial dislocation direction for slip on these close packed planes. Though B1 structures, such as NaCl and HfC predominately slip on < 110 > {110}, the ISF here is believed to facilitate slip on the {111} planes for this B1 HfN phase.

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13 citations in Web of Science
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Domestic collaboration
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Materials Science, Multidisciplinary
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