Abstract
The phase diagram in nm-sized Au–Sb alloy system has been studied by transmission electron microscopy. With decreasing system size, the increase of solid solubilities in solid solution or intermetallic compounds are significantly enhanced. With a further decrease in the system size, the pure substance continuously changes into solid solution, a highly disordered ultra-fine grain nanostructure and then to intermetallic compound as the solute concentration increases. The formation of the highly disordered ultra-fine grain nanostructures may be related to the low heterogeneous nucleation probability.
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