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The influence of the mode of deformation on recrystallization kinetics in Ni and Ti

July 19, 2022

In this webinar, we will present the effect of deformation mode (rolling and torsion) on the microstructural heterogeneities and subsequent recrystallization kinetics in a commercial purity Ni and Ti. In Ni, for a given equivalent von Mises strain, samples subjected to torsion have shown a higher fraction of recrystallization nuclei density (evaluated using grain orientation spread from EBSD scans), stored energy (using kernel average misorientation from EBSD scans), and high-angle boundaries when compared to rolled samples. On the other hand, in Ti, the rolled samples have a higher fraction of recrystallization nuclei, stored energy, and high-angle boundaries when compared to torsion-tested samples. This is due to the activation of deformation twinning during rolling. Analysis of recrystallization kinetics also shows a trend consistent with the stored energies observed in the deformed samples. The recrystallization kinetics and microstructural evolution were modeled using mean field and phase field models. From the mean field model, average mobility was obtained, which was used as input to the phase field model. The activation energy for recrystallization compared well with the activation energy for grain boundary mobility.

References

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  • Athreya, C.N. Mukilventhan, A. Satyam Suwas, Srikanth, V. Subramanya Sarma, V. Influence of the mode of deformation on recrystallization kinetics in Nickel through experiments, theory, and phase field model, Modeling and Simulation in Materials Science and Engineering (2018), 26, 035004
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  • Athreya, C.N. Satyam Suwas, Subramanya Sarma, V. Influence of mode of deformation on microstructure