Abstract
Several deformation modes have been applied so far which exhibited stage IV and stage V hardening in large strain cold working. However, some deformation modes especially if applied to single crystals failed (1) because of limited deformation (tensile test and compression), (2) inhomogeneous deformation (torsion), (3) iterative deformation (wire drawing, rolling) allowing for recovery processes in between small deformation steps. Moreover, except for torsion test, none of the deformation modes is capable of measuring the strain rate sensitivity up to large strains at low deformation temperatures. Thus it was the aim of the present work to deform single and polycrystalline samples of Al 99.99% in a simple shear test which has been shown to achieve also the late stages of deformation. Moreover, it should make possible strain rate sensitivity measurements in parallel to the shear stress-strain characteristics. For single crystals at room temperature the shear test seems to be the only method which can provide such data.
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