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Crystals 2018, 8(1), 1; https://doi.org/10.3390/cryst8010001

Local Stress States and Microstructural Damage Response Associated with Deformation Twins in Hexagonal Close Packed Metals

1
Department of Applied Physics, Zernike Institute for Advanced Materials and Materials Innovation Institute, University of Groningen, 9747AG Groningen, The Netherlands
2
Department of Mechanical Engineering, Cape Peninsula University of Technology, Cape Town 7535, South Africa
*
Authors to whom correspondence should be addressed.
Received: 17 November 2017 / Revised: 13 December 2017 / Accepted: 18 December 2017 / Published: 21 December 2017
(This article belongs to the Special Issue Crystal Indentation Hardness)
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Abstract

The current work implements a correlative microscopy method utilizing electron back scatter diffraction, focused ion beam and digital image correlation to accurately determine spatially resolved stress profiles in the vicinity of grain/twin boundaries and tensile deformation twin tips in commercially pure titanium. Measured local stress gradients were in good agreement with local misorientation values. The role of dislocation-boundary interactions on the buildup of local stress gradients is elucidated. Stress gradients across the twin-parent interface were compressive in nature with a maximum stress magnitude at the twin boundary. Stress profiles near certain grain boundaries initially display a local stress minimum, followed by a typically observed “one over square root of distance” variation, as was first postulated by Eshelby, Frank and Nabarro. The observed trends allude to local stress relaxation mechanisms very close to the grain boundaries. Stress states in front of twin tips showed tensile stress gradients, whereas the stress state inside the twin underwent a sign reversal. The findings highlight the important role of deformation twins and their corresponding interaction with grain boundaries on damage nucleation in metals. View Full-Text
Keywords: titanium; digital image correlation; detwinning; twin-grain boundary interactions; plastic deformation titanium; digital image correlation; detwinning; twin-grain boundary interactions; plastic deformation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Basu, I.; Fidder, H.; Ocelík, V.; Th.M de Hosson, J. Local Stress States and Microstructural Damage Response Associated with Deformation Twins in Hexagonal Close Packed Metals. Crystals 2018, 8, 1.

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