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The potential for significant grain refinement in pure aluminium (99.9%) processed by means of equal channel angular pressing at 523 K ( T/T  m  ∼ 0.6) has been demonstrated. The mean grain size was significantly reduced from 1.2 mm to 4 µm after eight passes. The stored energy and high-angle grain boundary fraction increase until 6 passes and then remain almost constant until 8 passes. The grain refinement occurred in two stages, initially driven by the evolution of deformation inhomogeneties (deformation bands, microbands) and then through recovery and the interaction of deformation inhomogeneties into fine grains.

Microstructure evolution in pure aluminium processed by equal channel angular pressing at elevated temperature