✍ Scribed by A. Salva-Ghilarducci; J.P. Simon; P. Guyot; I. Ansara
No coin nor oath required. For personal study only.
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 Al-Zn-Ag ternary alloys. For the first time, the independent partial structure functions &_a,,, Szn-~ and S,, have been determined from three scattering experiments successively reahxed with Ag natural, Ag,,, and Ag,, in AI-5.2at.%Zn-l.Sat.%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 Al-Zn alloys of the same composition; a single type of G.P. zone is formed; when a coarsening stage is &hed, the composition of the zones as detetmined from the scattering data appear to be in agreement with those given by a computation of the metastable phase diagram.
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