Abstract
Using a tight-binding-type electronic theory, we calculate the cleavage forces of the bcc transition metals α-Fe and V as a function of the separation distance between the two cleavage (001) planes. Particular attention is paid to an understanding of the effects of solute hydrogen on the cleavage strength (maximum force during the crystal cleaving process). It is shown that the effects of solute hydrogen on the cleavage strength are large and there are essential differences in the cleavage strength between a-Fe and V, which contain hydrogen atoms at octahedral and tetrahedral interstitial sites, respectively.
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