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Abstract
Variations in the thermoelectric power as a function of temperature (between −150 and 200 °C) and solute concentration were studied in aluminium-base alloys. The behaviour for normal and noble elements (magnesium, zinc and copper) is very different from the behaviour observed for transition elements (chromium, iron and manganese). A phenomenological interpretation is proposed, using an analysis of the relative effects of diffusion and phonon drag components. This interpretation leads to the values for the specific thermoelectric powers of various impurities. In alloys with a high solute concentration, anomalies are observed; these anomalies are interpreted as due to the inevitable presence of small clusters. In contrast, the fact that the existence of large precipitates has no influence on the thermoelectric power in the whole temperature range has been verified; therefore the thermoelectric power depends only on the residual solid solution.
Published Version
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