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Atomic cluster evolution and corrosion behaviour of Al84Ni10Gd6-xYx (x = 0, 2, 4 and 6) metallic glasses were investigated using experimental methods and ab initio molecular dynamic simulations. The shoulder peak area in x-ray diffraction patterns, enthalpy of second and third crystallization and population of <0 3 6 0> Ni-centered clusters increase with increasing yttrium content, but the onset temperature and enthalpy of first crystallization decrease simultaneously. Yttrium substitution and annealing treatment can aggravate metastable pitting and induce a thicker alumina film during polarization, which can be explained by the segregation of Ni-centered clusters and ordering of Al-rich clusters.

Role of Yttrium Substitution in the Atomic Cluster Evolution and Corrosion Behaviour of Al-Ni-Gd Metallic Glasses