Deviations from Mathiessen’s rule for dilute Al-Li alloys

Abstract

The temperature-dependent part of the electrical resistivity of polycrystalline Al-Li dilute alloys in a wide range of concentration of Li has been measured from 4.2 to 300 K. The phonon resistivity of the alloys varies as T n , where 2≤n≤5. At intermediate temperatures the deviation from Mathiessen's rule (DMR) for the alloys with low-impurity content passes through a broad maximum and the corresponding temperature depends on the impurity concentration as ∼c 1/5 . At high-enough temperatures the DMR Δ(c, T)/p 0 changes sign from negative values to positive as the Li concentration increases