Incipient plasticity in tungsten during nanoindentation: Dependence on surface roughness, probe radius and crystal orientation

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dc.contributor.authorBeake, Ben D.
dc.contributor.authorGoel, Saurav
dc.date.accessioned2018-05-10T18:39:35Z
dc.date.available2018-05-10T18:39:35Z
dc.date.issued2018-04-04
dc.description.abstractThe influence of crystallographic orientation, contact size and surface roughness effects on incipient plasticity in tungsten were investigated by nanoindentation with indenters with a range of end radius (150, 350, 720 and 2800 nm) in single crystal samples with the (100) and (111) orientations. Results for the single crystals were compared to those for a reference polycrystalline tungsten sample tested under the same conditions. Surface roughness measurements showed that the Ra surface roughness was around 2, 4, and 6 nm for the (100), (111) and polycrystalline samples respectively. A strong size effect was observed, with the stress for incipient plasticity increasing as the indenter radius decreased. The maximum shear stress approached the theoretical shear strength when W(100) was indented using the tip with the smallest radius. The higher roughness and greater dislocation density on the W(111) and polycrystalline samples contributed to yield occurring at lower stresses.en_UK
dc.identifier.citationBen D. Beake and Saurav Goel. Incipient plasticity in tungsten during nanoindentation: Dependence on surface roughness, probe radius and crystal orientation. International Journal of Refractory Metals and Hard Materials, Volume 75, September 2018, Pages 63-69en_UK
dc.identifier.issn0263-4368
dc.identifier.urihttps://doi.org/10.1016/j.ijrmhm.2018.03.020
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/13198
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectTungstenen_UK
dc.subjectAnisotropyen_UK
dc.subjectNanoindentationen_UK
dc.subjectIncipient plasticityen_UK
dc.titleIncipient plasticity in tungsten during nanoindentation: Dependence on surface roughness, probe radius and crystal orientationen_UK
dc.typeArticleen_UK

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