Abstract
Single crystals of 99.8 and 99.993% pure aluminum which were quenched from annealing treatments at 600°C and strained in tension exhibited marked effects in their deformation process. It was shown in this investigation that the stress axis “overshoots” the [100]-[111] symmetry line and that conjugate slip does not begin until “overshooting” reaches a maximum. Slip lines were found to be long, sharp, and straight with cross-slip in evidence. Stress-strain curves showed low rates of work hardening, and very little asterism was observed in Laue X-ray photograms as compared to those of furnace-cooled crystals, indicating that quenched crystals deform in a much less turbulent manner than do slowly cooled crystals. It is felt that the quenching operation involves the pinning of dislocations by quenched-in vacancies and that the “overshooting” behavior is due to latent hardening of the conjugate slip system as proposed for alpha-brass by Piercy, Cahn and Cottrell.(14)
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