Abstract
Recent anomalies have been reported for thermomigration results in aluminum and aluminum alloys. A sign reversal for the measured heat of transport and consequently a mass flux reversal in the thermomigration experiment was reported for self-thermomigration in pure aluminum and for thermomigration of copper in aluminum. These events occurred as a result of varying the grain or crystal size in the experiment. A grain size effect on the measured heat of transport for silver in aluminum has also been reported. Experimental data for non-isothermal diffusion of Ag 110 in aluminum has established the existence of stable point defect concentrations in excess of those predicted for thermal equilibrium and the explanation for the anomalies in aluminum thermomigration experiments is now possible.
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