Deformation mechanism of WC single crystals under nanoindentation: Effects of surface defects and orientation on pop-in and hysteresis
Nanoindentation was carried out on pure tungsten carbide (WC) on the basal (0001) and prismatic (1010) planes, using Berkovich and spherical indenters, in both single load and multi-load testing. The work focuses on correlating the load-displacement curves, including elastic to plastic deformation,...
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Main Authors | , , , , |
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Format | Journal Article |
Language | English |
Published |
07.01.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Nanoindentation was carried out on pure tungsten carbide (WC) on the basal
(0001) and prismatic (1010) planes, using Berkovich and spherical indenters, in
both single load and multi-load testing. The work focuses on correlating the
load-displacement curves, including elastic to plastic deformation, size effect
and hysteresis with the deformation behaviour of WC. With different specimen
preparation processes, the elastic to plastic deformation started at different
threshold loads: This observation was found to be due to the variation in
surface dislocation density. Staircase deformation was observed thought to be
caused by dislocation motion and the formation of slip bands; sudden
displacement discontinuities in the load-displacement response - associated
with dislocation loop nucleation - occurred at, or near the theoretical shear
strength. Furthermore, discontinuities in load-displacement curves were also
used to confirm that hysteresis loops were a result of plastic deformation, as
they when the loading was purely elastic. |
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DOI: | 10.48550/arxiv.2201.02411 |