Temperature dependence of the electrical resistivity of alloys with Guinier-Preston zones

The influence of the measuring temperature TM on the residual resistivity Delta rho has been investigated in four alloys (Al-Ag, Al-Cu, Al-Zn and Cu-Be) where Guinier-Preston zone information leads to the time dependence of the resistivity showing a maximum during ageing. In the two alloys where spherical precipitates form (Al-Ag and Al-Zn), the influence of Tm on Delta rho seems to be negligible while the presence of monolayer plate-like particles (in Al-Cu and Cu-Be) induces a higher peak occurring at a later ageing time when the measuring temperature is raised. These experimental results are analysed by using the most recent theoretical models and the effects on Delta rho of the deformations induced by the precipitates are investigated.