科研之友
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摘要
Various deformation mechanisms may contribute to the high temperature plastic deformation of twin-roll cast AlMg3 (AA5754) sheets. The evaluation of the strain rate sensitivity parameter m suggested that grain boundary sliding, which is generally responsible for superplastic behaviour, might be operating at certain temperature and strain rate conditions. The investigation of the surface relief of samples strained at various deformation conditions was carried out using atomic force microscopy. Both grain boundary sliding and dislocation slip were observed. Grain boundary sliding was accompanied by intensive cavitation that prevented the material from reaching superplastic values of ductility.
- 出版日期2008
