メカニカルアロイングによるNiおよびZr混合粉末の非晶質化

概要

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Amorphous NixZr100-x alloy powders (x=28, 33, 40, 45, 50, 65, 70) were synthesized by MA from crystalline powders of the elements using high-energy ball milling in an argon atmosphere. The alloying and amorphization process was investigated by X-ray diffractometry and differential scanning calorimetry. X-ray diffraction profiles taken as a function of milling time showed that, at the initial stage of MA, amorphization proceeded rapidly, that is, the preferential diffusion of Ni through Zr occurred rapidly and then proceeded slowly with increas-ing milling time. The amorphization by MA is found to depend on a large negative heat of mixing as the driving force of the diffusion. The radial-distribution functions, determined by X-ray diffractometry, are comparable to those measured for mechanical alloyed and liquid quenched amorphous Ni-Zr alloys of the same composition.
社団法人粉体粉末冶金協会の論文