The nature of dislocation loops in quenched aluminium

Abstract
It is shown by contrast experiments that more than 95% of the dislocation loops observed in quenched aluminium (99·995% Al) have a Burgers vector 1/3 rather than 1/2. This finding is confirmed by annealing experiments. The observation of large, faulted loops of dislocation in zonerefined aluminium (99·9999% Al), or in aluminium of 99·995% purity after oil quenching, is then simply explained.
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