Characteristics of vacancies and temperature coefficients of electrical resistivity in aluminum and its alloys
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The main source and sink of vacancies in large polycrystals of aluminum and alloys of Al+0.2–3.5% Cu and Al+0.02% Fe with small changes in temperature (ΔT=±6°) is the free surface. The time for relaxation of vacancies in samples 1 mm thick is 1–10 min at high temperatures.
In alloys of Al with 0.2–3.5% Cu the scattering capacity of monovacancies is an order higher than that of vacancies bound to copper atoms. The temperature dependence of the lattice electrical resistivity of aluminum and Al alloys matches the equation ρ = A + BT + CT2.
KeywordsCopper Aluminum Free Surface Electrical Resistivity Temperature Coefficient
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