5083-Oアルミニウム合金板材の引張変形における変形帯形成と直前に生じる不均一変形の関係

抄録

5083-O aluminum alloy sheet was subjected to tensile deformation at 318 K to investigate the state of deformation-band generation in terms of the generation position, generation order, etc. In the previous report, it was shown that the edge of the latter deformation band overlapped partially with that of the former deformation band. Furthermore, the tendency of the deformation bands to form successively in the same direction was suggested. In this study, a more detailed examination on the generation state of deformation bands was conducted. The results of this study are as follows. A slight stress variation in the stress-time curve was observed just before the onset of the deformation-band generation. The strain measurement conducted using strain gauges established that this stress fluctuation was related to the propagation of the inhomogeneous deformation region. The first deformation band was generated in front of the inhomogeneous deformation region and the subsequent deformation bands were successively generated in the same direction. Since the magnitude of strain increase and strain velocity related to the propagation of the inhomogeneous deformation region increased with time, it was suggested that the deformation scale of inhomogeneous deformation became large toward the onset of the deformation-band generation.