METASTABLE PHASE-DIAGRAM OF TI-CU-NI SYSTEM

Metastable states of Ti-Cu-Ni system alloys obtained at different cool ing rates are studied. On cooling at a rate of = 10(6) K/s from liquid state we obtained type alpha(n) martensitic phase formerly observed o nly in alloys of titanium with Va-VIs group elements (V, Nb, Mo, W). O n cooling at rates in the range 10(3).10(6) K/s the phase structure of the resulting alloys can virtually be described only by the so-called structure diagram which represents that or other phase system which a re not in equilibrium. The phase-structure diagrams characterize a the rmodynamically non-equilibrium, but structurally metastable state of a system appearing at high cooling rates of melts.