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Pugh’s criterion in terms of the bulk/shear modulus ratio (B/G) is widely used to distinguish the ductility and brittleness of metals, with the recommended B/G ratio of 1.75 for the boundary ratio between ductility and brittleness. The present first-principles calculations yield a B/G=3.69 for the C15 Laves phase NbCr2, suggesting the ductility of NbCr2 according to Pugh’s criterion. However, experiments...
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