Abstract
The effect of hydrostatic pressure on the kinetics of intermetallic layer growth in interdiffusing three-phase two component systems has been examined theoretically. A system has been selected for detailed analysis, in which the kinetics of layer growth are controlled by equilibrium interface concentrations and by the diffusion coefficient in the growing intermetallic phase. An equation has been derived which enables one to estimate the relative importance to intermetallic layer growth of pressure-induced changes in the diffusion coefficient and pressure-induced shifts in the interface boundary concentrations. Also, an estimate has been made of the importance of pressure-induced shifts in equilibrium concentrations in affecting the kinetics of growth of the ε (UAl 3) phase layer in the aluminum-uranium system and of the γ (Ni 2Al 3) phase layer in the aluminum-nickel system. It is concluded that the pressure-induced increase in ε growth rate cannot be rationalized on the basis of shifts in the equilibrium concentrations. The pressure-induced decrease in growth rate of the γ phase is attributed primarily to a decrease in diffusion coefficient; equilibrium concentration shifts play a minor role.
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