Chemical Short-Range Structure of Ti-Ni-X(X = V, Cu) Amorphous Alloys

摘要

The chemical short range order in an amorphous alloy system can be skillfully extracted from the neutron diffraction data, provided that an average neutron scattering amplitude can be reduced to zero. In the present experiment, a series of Ti-Ni-X (X=V, Cu) systems are designed by taking an advantage of the fact that the values of for Ti_(0.76)Ni_(0.24), Ti_(0.7)Cu_(0.3) alloys and V are almost zero. Amorphous samples were 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 promotes the chemical short range order. In contrast, a decrease of the chemical short range order was found in the Ti-Ni-Cu amorphous alloys with increasing Cu concentration.