Abstract
Neutron small angle scattering with isotopic contrast has been used to investigate the solute partitioning and its evolution with time during the decomposition of various AlZnAg ternary alloys. For the first time, the independent partial structure functions S Zn Zn , S Zn Ag and S Ag Ag have been determined from three scattering experiments successively realized with Ag natural, Ag 107 and Ag 109 in Al-5.2at.%Zn-1.5at.%Ag specimens quenched and aged in the same way at room temperature. A comparison is made with a classical two-phase modelling namely spherical Guinier-Preston zones dispersed in a solute depleted matrix. The principal metallurgical features are as follows: Ag slows down the unmixing kinetics as compared with binary AlZn alloys of the same composition; a single type of G.P. zone is formed; when a coarsening stage is reached, the composition of the zones as determined from the scattering data appear to be in agreement with those given by a computation of the metastable phase diagram.
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