Solid state reactions in Ni-Al-Ti-C system by mechanical alloying

Thermodynamic values for the liquid phase and phase equilibrium data of Cu-Si available in the literature were analyzed to yield a thermodynamic description of this system which is an important binary for many multicomponent technologically important alloys. In contrast to the calculated phase diagrams using descriptions available in the literature, the calculated diagram using the present one agrees with experimental data in terms of the liquidus, the solidus and the (Cu) solvus as well as the temperatures and compositions of the coexisting phases for 10 invariant equilibria. The calculated enthalpy of mixing of the liquid alloys also agrees with experimentally measured values. The intermediate phases -Cu15Si4, Cu19Si6, -Cu56Si11 and -Cu33Si7 were taken to be line compounds as were done in all previous descriptions. This assumption was made since these phases have rather small ranges of homogeneity and they have minimum effects on phases in technologically important multicomponent alloys. This improved description can be used with confidence to obtain descriptions for higher order alloys.