Abstract
The paper describes the mechanism and kinetics of dissolution of phases previously formed as a result of cellular discontinuous transformation in the aged 40 wt% zinc aluminium alloy. The elementary processes were singled out: dissolution of zinc phase, formation of inhomogeneous solid solution, homogemzation and the formation of homogeneous stable phase. The conditions were determined for the domination of the mechanism of continuous and discontinuous dissolution, as well as the influence of annealing temperature within the range 360–400°C, the influence of the size of initial particles, and the impact of deformation by rolling the aged alloy. It has been shown that the discontinuous mechanism of dissolution dominates below 360°C when the interlamellar spacing is greater than 1300 A, and the degree of deformation is lower than 60%. It has been observed that the dissolution process increases dislocation density in the forming phase. A model has been proposed for the nucleation of cellular dissolution and the dissolution kinetics was described quantitatively for the discontinuous and continuous transformations.
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