Shear-induced metallization on (001) and (111) surfaces of diamond during hardness tests - S. M. Dub; A. S. Nikolenko; P. M. Lytvyn; S. O. Ivakhnenko; V. V. Strelchuk; O. M. Suprun; V. V. Lysakovskyi; I. M. Danylenko (Superhard Materials, 2021)