Abstract
Microcalorimetric experiments in pre-annealed and furnace cooled αCu-Al alloys containing 19,13, and 6.5 at. pct aluminum were performed at different heating rates. The features displayed by the differential scanning calorimetric traces were studied with reference to the rate of equilibration of the processes associated to a disperse order model (volume fraction and particle number adjustment, and domain dissolution). Such a comparison indicates that the observed features harmonize quite well with this model. The disordering reactions were found to be first order transitions. Volume fractions and radii of the ordered particles as well as latent and molar heats of dissolution were calculated. The decrease of the critical temperatureT c with increasing Al content is explained through a combination of the lattice parameter and the quasichemical effects. The molar entropy of dissolution increases as the alloy becomes more concentrated, indicating that internal order within domains also increases correspondingly.
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