Abstract
Present investigation has been made to study the superplastic deformation behavior of Ti-6Al-4V alloy with respect to the variation of α/β volume fraction. The results have been analyzed by the theory of inelastic deformation which consists of two mechanisms, i.e., the grain matrix deformation and the phase/grain boundary sliding. Grain matrix deformation is found to be dominant at 600 °C and well described by the plastic state equation when a permeability parameter, p, is 0.15. Phase boundary sliding becomes dominant at 800 °C and also consistent with the viscous flow equation with Mg = 0.5. The flow stress curves for the fine grained structures (3 μm) are well agreed with the iso-stress model, while those for large grained materials are the mixed mode of iso-stress and iso-strain rate modes. The largest elongation obtained in the 48% β structure is primarily attributed to the phase boundary sliding occurring predominantly in the microstructure.
Original language | English |
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Pages | 141-150 |
Number of pages | 10 |
State | Published - 1997 |
Event | Proceedings of the 1997 TMS Annual Meeting - Orlando, FL, USA Duration: 9 Feb 1997 → 13 Feb 1997 |
Conference
Conference | Proceedings of the 1997 TMS Annual Meeting |
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City | Orlando, FL, USA |
Period | 9/02/97 → 13/02/97 |