Abstract
It is shown that when a crystalline alloy is characterized by two order parameters, the alloy may develop various combinations of the two order parameters en route to a final equilibrium state. The kinetic evolution of the two order parameters in a ternary alloy with B2 order is analyzed with an activated state rate theory. Elementary vacancy jump processes are considered in a Master Equation formulation. A two dimensional transport equation describing the evolution of the alloy through the two order parameters is developed, and the chain of states in this two dimensional order parameter space is found by numerical solution of the transport equation. It is shown that either different interatomic interactions or different activation barrier heights for the diffusive jumps of the different atoms will cause the alloy to evolve through different nonequilibrium states, or along different “kinetic paths”.
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