MAで作製した(Ti76Ni24)x(Ti70Cu30)1-xアモルファス合金の熱的性質と化学的短範囲構造

概要

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(Ti76Ni24)x(Ti70Cu30)1-X neutron zero scattering amorphous alloys were synthesized by mechanical alloying. The concentration-concentration correlation functions of the alloy systems could be directly observed by neutron diffraction, because the averaged neutron scattering amplitudes of the amorphous alloys are set to be zero. The chemical short range order parameter a calculated from the Warren definition turns out to be negative for all pseudo-binary Ti-(Cu, Ni) amorphous alloys. The value of a is found to rapidly decrease with increasing Ni content. The results indicate that an increase in the chemical short range order by alloying with Ni element is ascribed to the stronger affinity of a Ni atom with a Ti atom than a Cu atom. Moreover, it was found that the chemical short range order strongly affects with the thermal properties, i.e., the crystallization temperature and the enthalpy of crystallization.
社団法人粉体粉末冶金協会の論文