Incipient plasticity in tungsten during nanoindentation: Dependence on surface roughness, probe radius and crystal orientation
Journal article
Beake B and Goel, S. (2018). Incipient plasticity in tungsten during nanoindentation: Dependence on surface roughness, probe radius and crystal orientation. International Journal of Refractory Metals and Hard Materials. 75, pp. 63-69. https://doi.org/https://doi.org/10.1016/j.ijrmhm.2018.03.020
Authors | Beake B and Goel, S. |
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Abstract | The 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. |
Keywords | BCC; Tungsten |
Year | 2018 |
Journal | International Journal of Refractory Metals and Hard Materials |
Journal citation | 75, pp. 63-69 |
Publisher | Elsevier |
ISSN | 0263-4368 |
Digital Object Identifier (DOI) | https://doi.org/https://doi.org/10.1016/j.ijrmhm.2018.03.020 |
Web address (URL) | https://www.sciencedirect.com/science/article/abs/pii/S026343681830060X |
Publication dates | |
04 Apr 2018 | |
01 Sep 2018 | |
Publication process dates | |
Accepted | 31 Mar 2018 |
Deposited | 23 Dec 2019 |
Accepted author manuscript | License File Access Level Open |
https://openresearch.lsbu.ac.uk/item/88v59
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