Abstract
The study of the discontinuous precipitation reaction and the lamellar precipitate dissolution in the alloy Cu-In system provoked a considerable benefit and has been the subject of many theoretical and experimental investigations. The aim of this work is to make the evidence on the one hand the effect of the plastic deformation on the mechanism of the discontinuous precipitation reaction such as nucleation, growth and lamellar coarsening and in other hand the effect of temperature on the characteristics and front behavior movement of the opposite reaction (discontinuous dissolution). Different techniques of analysis have been used in this respect such as the optical microscopy, the differential thermal analysis and the microhardness Vickers. The obtained results confirm various works achieved in this field.
Highlights
The aim of this work is to make the evidence on the one hand the effect of the plastic deformation on the mechanism of the discontinuous precipitation reaction such as nucleation, growth and lamellar coarsening and in other hand the effect of temperature on the characteristics and front behavior movement of the opposite reaction
The mechanisms of discontinuous precipitation nucleation suggested by Fournelle and Clark [11], by You and Turnbull [9] are most plausible in this alloy system, i.e. it is a transformation related to the grain boundary dynamics
The temperature of ageing of 400 ̊C reveals only the discontinuous precipitation and not of other morphology precipitates whatever the deformation rate, the precipitate are of the double hems type, Figures 5(b), 5(d) and 5(f) with the reaction front has a corrugated pace
Summary
The growth model in this alloy system is that proposed by Frebel and Schenk [12] and of which the speed growth of the precipitated lamellas depends primarily on the speed of ageing annealing and the solute content of this alloy system, Figure 1 [13]. Two types of cellular reactions were observed by Spenger and Mack [14] in this alloy system, one fine and the other coarse, in both cases the lamellas are uniformly distributed. Predel and Gust [15] has shown the same observation Figure 2, where the formation of the coarse lamella proceeds mainly between two fine lamellas and in both cases the process is controlled by the diffusion on the grain boundaries.
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