Kinetics of Phase Separation in Ternary Alloys

抄録

The asymptotic behavior of the minor element, Z, in a X-Y-Z ternary alloy associated with decomposition of the major element, Y, is classified into three groups according to the sign of the second derivative of the chemical free energy f₁ with respect to the concentration of Y, c_Y and the concentration of Z, c_Z: In the case of ∂²f₁/∂ c_Y ∂ c_Z>0, the value of c_Z along the trajectory of the peak top of the Y decreases with time. When ∂²f₁/∂ c_Z ∂ c_Y<0 at 0≤ t<∞, peaks of c_Z formed at peak tops of Y. The amplitudes of these peaks increase with time. If ∂²f₁/∂ c_Y ∂ c_Z<0 at 0≤ t<t₀ and ∂²f₁/∂ c_Y ∂ c_Z>0 at t₀<t<∞, bifurcation of peaks occurs at the later stage.