Abstract
Reverse bending fatigue tests were conducted on high purity polycrystalline aluminum in the temperature range from 298 to 773 K. Observations show that the grain boundaries migrate and slide at temperatures above ≈500 K. The activation energy for migration is estimated as 76.1 ± 5.0 kJ mol −1 and this is consistent with other measurements on high purity Al. Migration occurs cyclically but there is a small proportion of the boundaries, of the order of 10%, which are immobile and exhibit no measurable migration. Grain boundary sliding occurs at both the migrating and immobile boundaries, but at the migrating boundaries the total sliding offset, measured by a projection of interference fringes across the migrated region, tends to be small. Careful inspection shows that migration usually precedes sliding at the migrating boundaries, and the migration of triple junctions leads to the formation of very diffuse triple point folds.
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