Crystal-to-glass transformation in the Ni-Ti system by mechanical alloying and consequent surface area

Abstract
The structural transformation occurring by mechanically alloying nickel and titanium crystalline powders has been investigated by a variety of X-ray techniques, up to the complete formation of an amorphous Ni50Ti50 phase. Whether the starting pure metal powders are highly strained or not, the amorphization reaction takes the same milling time to arrive at completion, and the surface area of the final amorphous powder is about 20m2g−1. This value is about three orders of magnitude higher than that reported for amorphous flakes prepared by grinding melt-quenched ribbons. The result suggests that mechanically alloyed powders can be used conveniently for catalytic performance.