2022/01/07 by Hannah Zhang, F. De Luca, Zhang, Hannah +7
Engineering · Materials Science · #Advanced materials and composites #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Metal and Thin Film Mechanics
paper · pdf · doi:10.48550/arxiv.2201.02411
openalex publication_date 2022/01/07 · openalex created_date 2022/12/23 · openalex updated_date 2026/07/28
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.