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We propose the ratio of critical strain energy density by distortional deformation over that by volumetric deformation as a material parameter to quantify the ductile-to-brittle transition in bulk metallic glasses (BMG). A BMG is regarded to be ductile (with high fracture toughness) if the ratio is low, implying shear dominated deformation precedes cavitation failure. In contrast, the BMG is brittle...
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