Characteristics of the GBS-SDC Transition during Bi-axial Forming of AA5083


T. McNelley, Oh-ishi, K., Swaminathan, S., Bradley, J., Krajewski, P. E., and Taleff, E. M., “Characteristics of the GBS-SDC Transition during Bi-axial Forming of AA5083,” Materials Science Forum, vol. 735, pp. 43–48, 2012.


Thermomechanical processing to enable superplasticity in AA5083 materials includes cold working followed by heating prior to hot blow forming. Upon heating for forming at 450°C, a B-type ({110}) rolling texture is replaced by a near-random texture with a weak superimposed cube orientation parallel to the sheet normal. The presence of refined grains 7 – 8μm in size reflects the predominance of particle-stimulated nucleation of recrystallization prior to forming. The subsequent evolution of microstructure, texture and cavitation behaviour during biaxial deformation in the solute drag creep (SDC) and grain boundary sliding (GBS) regimes will be presented.