MAによって作製された中性子零散乱Ni-Tiアモルファス粉末の化学的原子構造

概要

論文の詳細を見る
The starting powders of Ni24.3Ti75.7 composition were amorphized by mechanical alloying(MA). The concentration-concentration correlation function was directly observed by neutron diffraction, because the average coherent scattering length of the alloy powders is adjusted to be zero, i.e., =0. The negative peak at r=2.54 Å in the reduced radial concentration correlation function GCC(r) can be taken as evidence for the preferential formation of the Ni-Ti unlike atom pair, the distance of which is smaller than that calculated from the diameters of Ni and Ti atoms. The Warren chemical short range order parameter of the Ni24.3Ti75.7 amorphous alloy was evaluated to be a negative value of -0.097. These findings clearly demonstate the preferential existence of Ni-Ti unlike atom pairs at the nearest neighbor coordination in the Ni24.3Ti75.7 amorphous alloy synthesized by MA.