Article ID Journal Published Year Pages File Type
1501344 Scripta Materialia 2010 4 Pages PDF
Abstract

The ideal tensile and shear strengths of TiB2, ZrB2 and HfB2 have been investigated by first-principles stress–strain calculations. Among the studied diborides, TiB2 unexpectedly exhibits the weakest shear strength in the (0 0 0 1) basal plane, comparable to that of ZrB2 and HfB2 in the {101¯0} prismatic planes. Due to the nonlinearity of the stress response at large stains, the plastic anisotropy cannot be derived from elastic constants. Based on the relative stiffness of boron hexagons, a bond length indicator is obtained to characterize the preference for basal or prismatic slip in diborides.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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