Hardness Anisotropy of Single Crystals of IVa-Diborides

1 February 1973

journal article
Published by IOP Publishing in Japanese Journal of Applied Physics

Vol. 12 (2) , 186-189
https://doi.org/10.1143/jjap.12.186

Abstract

Knoop hardness is examined as a function of indenter orientation on the (0001), {100} and {110} surfaces of TiB₂, ZrB₂ and HfB₂. The hardness of the two kinds of prismatic planes and the hardness anisotropy of each plane are higher than those of the basal plane in TiB₂. The hardness of the basal plane tends to be higher than that of the prismatic planes in ZrB₂, but the difference between them is not very large. In HfB₂, the difference itself is not large, but contrary to that in ZrB₂ the prismatic planes have a tendency to give higher hardness than the basal plane, and the hardness anisotropy of each plane is small. The measured anisotropy is compared with the result obtained with the analytical method and the main slip system that contributes to the hardness anisotropy of these crystals is discussed.

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