Abstract
A study of shear band formation in aluminium during cyclic extrusion-compression at high strain amplitude was performed. The techniques employed enabled the metal to be deformed far beyond the strains available by conventional monotonic deformation methods. The measurements of microhardness, along with optical and TEM observations, have shown that at strains on the order of 6.0 aluminium enters the saturation stage. Prior to the saturation, formation and rapid multiplication of shear bands was observed. It has been found that formation of shear bands is independent of the mode of deformation (monotonic or cyclic). The structural features of shear bands and their effect on the mechanical performance of aluminium has been revealed. The origin of shear bands is discussed in terms of geometrical vs structural softening models.
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