Abstract
The mechanical properties and microstructures have been examined in several aluminium alloys after various cold rolling reductions. The investigation includes super-purity aluminium, commercial purity aluminium and an AlMnl-alloy. The variation in flow stress with rolling reduction can be reasonably well represented by Ludwik's law up to a strain of 3. At larger strains some observations indicate a transition towards linear hardening. The subgrain size decreases with increasing rolling reduction. Seen in a section perpendicular to the sheet plane the subgrains become increasingly more pancake shaped with increasing rolling strain. The subgrain misorientation increases with strain up to a strain of 1, above which it remains approximately constant with increasing rolling reduction. The variation in flow stress with strain has been discussed in terms of current work hardening models.
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