Abstract
The cyclic-hardening behavior of polycrystalline Cu-16at.%Al alloy has been investigated with special reference to the back-stress and friction stress behavior and discussed in relation to the behavior of single crystals. The friction stress in the polycrystalline anlloy measured by thge Cottrell method (42 MPa) at the start of cycling is larger than that predicted (36.7 MPa) from the friction stress of single crystals by using the Taylor factor (3.06). This difference is explained in terms of the difference of initial dislocation densities in the two types of material. The cyclic hardening of this alloy is mainly caused by an increase of back stress. However, unlike alloy single crystals which do not undergo saturation, the back stress in polycrystals gradually saturates with cycles, and such behavior produces overall saturation. This saturation in the peak stresses of polycrystalline Cu-16at.%Al alloy seems to be caused by the saturation of hardening in the later stages of cyclic deformation, not by the “recovery” of dislocations induced by secondary slip as in copper. The different role of secondary slip in Cu-1615.%Al alloy in comparison to that in copper is discussed.
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