CHEMICAL SHORT-RANGE STRUCTURE OF TI-NI-X (X=V,CU) AMORPHOUS-ALLOYS

The chemical short range order in an amorphous alloy system can be ski llfully extracted from the neutron diffraction data, provided that an average neutron scattering amplitude [b] can be reduced to zero. In th e present experiment, a series of Ti-Ni-X (X=V, Cu) systems are design ed by taking an advantage of the fact that the values of [b] for Ti0.7 6Ni0.24, Ti0.7Cu0.3 alloys and V are almost zero. Amorphous samples we re synthesized by mechanical alloying. The Warren chemical short-range order parameter can be deduced from the radial concentration function . An increase in V concentration in the Ti-Ni-V amorphous alloys promo tes the chemical short range order. In contrast, a decrease of the che mical short range order was found in the Ti-Ni-Cu amorphous alloys wit h increasing Cu concentration.