Abstract
The effect of thermally induced structural evolution on the corrosion behavior of Al-Ni-Y amorphous alloys was investigated. Structural relaxation annealing significantly enhanced the corrosion resistance of Al-Ni-Y alloys, and the main reason was attributed to the decreased free volume promoting the formation of a highly protective passive film. The corrosion behavior of Al-Ni-Y alloys was closely associated with nanocrystal size after partially devitrified annealing. The larger nanocrystals caused more obvious composition heterogeneity around the nanoscale precipitates, deteriorating the corrosion resistance. In addition, the component and energy band of the passive film on Al-Ni-Y alloys with structure evolution were also discussed.
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