Abstract
Thermodynamics of the displacive mechanism of plate-shaped phase α 1 was analyzed in β'Cu-Zn alloys. It was proposed that the displacive transformation of the α 1 plate took place in the solute-depleted region formed in the parent phase during the incubation period. The thermodynamic analysis indicated that the driving force of α 1 transformation, ΔG, increased with the reduction of x d , the solute concentration of the depleted region. And, ΔG could overcome the transformation barrier with solute depletion to a certain degree. In addition, x d was higher than the equilibrium concentration in the phase diagram. Therefore, the shear formation of α 1 plate in the solute-depleted region was thermodynamically supported.
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