The local structure nature for a Ti-based bulk metallic glass

In the present work, the local atomic structures of a Be-containing Ti-based bulk metallic glass (BMG) have been characterized using electron spectrum for chemical analysis and Raman scattering, including directional bonds and medium range order. It might suggest that a coefficient could be extracted from Raman scattering to characterize the glass forming ability (GFA), which could be employed to interpret the enhanced GFA by Be addition of Ti-based BMG. Additionally, compared with the crystallized sample, the glassy sample exhibits larger average bond length and larger content of local bond distortion using Raman scattering.

► The directional bonds in TiZrNiCuBe bulk metallic glass are primarily comprised of BeNi and BeCu bonds.
► A coefficient η could be extracted from Raman scattering to characterize the glass forming ability.
► The weak directional bonds dependent on Be could increase the localized electrons, facilitating the glass forming ability.