Correlation between elastic constants and flow behavior in metallic glasses

Abstract

The addition of glass formers, B and P, raises not only the shear stiffness but also the tensile yield strain (ε_y) of Fe‐ and Co‐based glasses. ε_y increases by a factor of 2 from 1.23×10⁻² for Pt–Ni–P glasses to 2.45×10⁻² for Fe–B glasses as the Poisson’s ratio decreases from 0.42 to 0.32. The Vickers hardness of a Fe₇₅B₂₅ glass attains 1300 kg/mm² which is the highest value reported for metallic glasses. The directionality of interatomic forces either due to atomic ordering or s‐d hybrid bonding in transition metals is proposed to be responsible for this behavior.