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Localization of Strain Rate at Mesoscale and Its Effect on the Measured Strain Rate Sensitivity During Superplastic Deformation |
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| Authors: | Sudipto Ghosh |
| Affiliation: | a Tata Research Development and Design Centre, Pune, India |
| Abstract: | Microstructural observations on specimens deformed in regions I, II and III of superplasticity suggest that the dislocation activity is restricted to limited grains in region I but spreads to almost all grains in the region III. Analysis has been carried out to show that the transition from the localized plastic flow in region I to relatively homogeneous plastic flow in region III significantly contributes to the high strain rate sensitivity observed in region II. |
| Keywords: | Superplasticity Region II Grain boundary sliding Localization Mesoscopic Strain rate sensitivity Grain size Dislocation density Atomistic mechanism Accommodation Plane stress Intragranular Effective strain rate sensitivity Slip line Ultrafine grain |
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