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Abstract
Abstract Small-angle X-ray scattering measurements are reported for a commercial Al-8·49%Li-51% Cu (atomic composition) alloy solution treated at 520°C and thermally aged for several times at several temperatures. Data have been analysed by means of a model of ellipsoidal precipitate particles previously proposed by some of us and by a modification of this model where, in the interparticle interference term, allowance is made for interactions between the precipitate particles at longer range than previously. This was achieved by the introduction, in addition to the hard-sphere interaction potential, of a potential step. Our fits indicate that the precipitate particles interact through a repulsive potential of the order of 0.6k B T. Particle dimensions obtained from the fit indicate that the Lifshitz-Slyozov coarsening mechanism holds. However the activation energy for volume diffusivity obtained for the present alloy is 15% smaller than those previously reported for other commercial alloys and for pure bi...
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