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Crystal plasticity modeling of deformation in FCC metals and predictions for recrystallization nucleation

Chakraborty, Supriyo
http://rave.ohiolink.edu/etdc/view?acc_num=osu1638102213287333

Abstract Details

2021, Doctor of Philosophy, Ohio State University, Materials Science and Engineering.
Crystal plasticity modeling was used to understand the deformation process of FCC metals and alloys. Firstly, we investigated the issue of cube texture development during static recrystallization of FCC metals, which has been vigorously debated over the last 70 years. A Full-field elasto-viscoplastic fast-Fourier transform (EVP-FFT)based crystal plasticity solver coupled with dislocation density based constitutive model was employed to understand the deformation process in copper under plane strain compression. Simulation results revealed that the grains with initially cube orientation retained a small fraction of the cube component in the deformed state, whereas, some of the grains with initially non-cube orientations developed the cube component during the deformation. For strain up to 0.46, non-cube grains which are within 10-20 deg from the ideal cube orientation showed the highest affinity to develop the cube component during deformation. However, the cube component developed during the deformation was unstable and rotated away from the cube orientation with further deformation. With increasing strain up to 1.38, some of the grains with higher angular deviation from the ideal cube orientation also developed the cube component. No particular axis preference was observed for the non-cube grains, rather, the evolution of the cube component becomes dynamic at larger strain. Rotation of the non-cube grains towards the cube component is mainly driven by the local relaxation of the imposed boundary conditions. Significant changes in lattice rotation and slip activity were observed with different relaxed constraints. Best correlation was found for the e13 strain component and the development of cube component. Analysis of the disorientation angle and the dislocation density difference with the neighboring locations showed that the cube component developed during the deformation can play a significant role during nucleation. Secondly, we used the mean-field visco-plastic self-consistent (VPSC) and the full-field EVP-FFT based crystal plasticity models to investigate the effect of different deformation modes and their interactions on the mechanical behavior and texture evolution in the equiatomic CrCoNi alloy. The presence of twin/HCP lamella has been attributed to the excellent mechanical behavior of this alloy. However, this hypothesis is not critically studied yet. An electron back scatter diffraction (EBSD) microstructure image was considered as input for both the EVP-FFT and VPSC simulations. We found the latent hardening ratio of twin to slip systems is approximately three times higher. Although twinning started to occur in those grains which are oriented along <111>, substantial twinning has been found in almost all the grains at higher strain. We observed that the overall texture evolution is only influenced by slip mechanism and twinning has negligible effect on it. grain rotation predicted by the full field simulations matched well with the EBSD observation.
Stephen Niezgoda (Advisor)
Michael Mills (Committee Member)
Yunzhi Wang (Committee Member)
Materials Science; Mechanics; Metallurgy
crystal plasticity, recrystallization, cube texture, nucleation, dislocation density, high entropy alloy

Recommended Citations

Citations

  • Chakraborty, S. (2021). Crystal plasticity modeling of deformation in FCC metals and predictions for recrystallization nucleation [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1638102213287333

    APA Style (7th edition)

  • Chakraborty, Supriyo. Crystal plasticity modeling of deformation in FCC metals and predictions for recrystallization nucleation. 2021. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1638102213287333.

    MLA Style (8th edition)

  • Chakraborty, Supriyo. "Crystal plasticity modeling of deformation in FCC metals and predictions for recrystallization nucleation." Doctoral dissertation, Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1638102213287333

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.