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Extended x-ray-absorption fine-structure studies on ball-milled powders of the immiscible system Cu-V.

The extended x-ray-absorption fine structure (EXAFS) of mechanically alloyed Cu 50 V 50 and Cu 30 V 70 , which were obtained from ball milling of a mixture of pure metallic copper and vanadium powders, has been studied. A significant change in the copper K x-ray-absorption spectra was observed as the milling time increased, while the basic oscillation pattern of the vanadium K EXAFS did not change so much. This indicates that a supersaturated solid solution is formed such that copper atoms enter into the bcc vanadium lattice in spite of their extremely limited dissolubility in the phase diagram