Abstract
Recrystallisation in commercial purity aluminium following different strain paths has been investigated. The deformation was carried out using torsion, compression, fully reversed torsion, and torsion followed by compression along the torsion axis, the latter combination giving an orthogonal change in straining state. Recrystallisation behaviour following deformation was determined by optical metallography. Complete reversal of deformation had a very marked effect, significantly retarding subsequent recrystallisation compared with unidirectional deformation to the same levels of accumulated effective strain. In contrast, orthogonal straining had little significant effect. A larger grain size also resulted from fully reversed deformation. The results can be notionally explained by considering the effect of strain path changes on the cell structure developed in deformation.
MST/3125
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