Abstract
It is well known that during a preprecipitation process in which the formation of Guinier-Preston zones takes place, an increase of resistivity at its early stage, followed by a decrease, occurs in a number of age-hardenable aluminium-base alloys. Recently we have experimentally determined the contribution of one G.P. zone to the electrical resistivity and discussed the influence of size and shape of G.P. zones on the scattering power in Al-Zn alloys. It has been shown that the scattering power of a G.P. zone increases with its size.The objects of the present paper are to investigate in detail the influence of size and inner structure of G.P. zone on the scattering power for Al-Ag alloys in which two kinds of G.P. zones are known to form at each aging temperature and to compare with the scattering power of G.P. zones in Al-Zn alloys. The electrical resistivity and X-ray small-angle scattering measurements have been performed for several Al-Ag alloys aged at 140 and 190°C.It is shown that the scattering power of a G.P. zone increases with its size, though the size dependence is different for each aging temperature. This behavior of the scattering power is explained in terms of the difference in the inner structure of G.P. zones in Al-Ag alloys.
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