Surface structure and properties of NiZr model metallic glasses: A molecular dynamics simulation

Chemical segregation in metallic glass nanowires

“…Another unique aspect of MG is that its surface energy is insensitive to the alloy composition change in a non-reactive environment. 30,37 In crystalline alloy NWs, chemical segregation is often considered as a result of the difference in the surface energy that is strongly dependent on composition, i.e., the lower surface energy of certain alloy element enriched on the surface such as Ag in AgAu alloy. The difference in surface energy forms the thermodynamic driving force for segregation.…”

“…But our previous work demonstrated that surface energy of metallic glass is not very sensitive to chemical composition, at least in the glass forming range since the amorphous structure is already disordered and thus much accommodating to changes in different chemical concentration. 30 Therefore, such argument may not be suitable in amorphous systems. Another is the kinetic explanation from thermal activated diffusion: Since Cu atom is a faster diffuser, therefore, it can easily move to surface which has low activation barrier.…”

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic glasses

“…However, several recent investigations on bulk metallic glasses ͑BMGs͒ made of Zr-based metals demonstrated prevalent pitting corrosion, which is most notorious in limiting applications. 6 As surface is the first line of defense for corrosion, the structure-property relation should be manifested on the surface properties. For instance, Schroeder et al 2 reported that the BMG made of Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 is only slightly better in NaCl solution and no better in NaClO 4 solutions than their crystalline counterpart in pitting corrosion resistance.…”

“…6 The most likely source is therefore from the structural property, or the packing in the systems, as the structure homogeneity can directly extend to the surface. Since there is small composition difference between the two systems, the cause to the surface energy difference is expected to be small.…”

Analytical model and molecular dynamics simulations of the size dependence of flow stress in amorphous intermetallic nanowires at temperatures near the glass transition

“…[7][8][9][10] Recent molecular dynamics simulations also suggest that long-range diffusion is feasible under certain conditions. [11][12][13] Drawing an analogy from polycrystalline materials-where deformation is accommodated by competing mechanisms with relative contributions determined by different rates-we suggest that such kinetics may apply to the deformation in amorphous solids at sufficiently high temperatures.…”