A physically-informed continuum crystal plasticity model is presented to elucidate deformation mechanisms, dislocation evolution and the non-Schmid effect in body-centered-cubic (bcc) tantalum widely used as a key structural material for mechanical and thermal extremes. We show the unified structural modeling framework informed by mesoscopic dislocation dynamics simulations is capable of capturing salient features of the large inelastic behavior of tantalum at quasi-static (10-3 s-1) to extreme strain rates (5000 s-1) and at low (77 K) to high temperatures (873 K) at both single- and polycrystal levels. Here we also present predictive capabilities of the model for microstructural evolution in the material. To this end, we investigate the effects of dislocation interactions on slip activities, instability and the non-Schmid behavior at the single crystal level. Furthermore, ex situ measurements on crystallographic texture evolution and dislocation density growth are carried out for polycrystal tantalum specimens at increasing strains. Numerical simulation results also support that the modeling framework is capable of capturing the main features of the polycrystal behavior over a wide range of strains, strain rates and temperatures. The theoretical, experimental and numerical results at both single- and polycrystal levels provide critical insight into the underlying physical pictures for micro- and macroscopic responses and their relations in this important class of refractory bcc materials undergoing large inelastic deformations.
Lee, Seunghyeon, et al. "Deformation, dislocation evolution and the non-Schmid effect in body-centered-cubic single- and polycrystal tantalum." International Journal of Plasticity, vol. 163, no. N/A, Jan. 2023. https://doi.org/10.1016/j.ijplas.2023.103529
Lee, Seunghyeon, Cho, Hansohl, Bronkhorst, Curt A., Pokharel, Reeju, Brown, Donald W., Clausen, Bjørn, Vogel, Sven C., Anghel, Veronica, Gray, George T., & Mayeur, Jason R. (2023). Deformation, dislocation evolution and the non-Schmid effect in body-centered-cubic single- and polycrystal tantalum. International Journal of Plasticity, 163(N/A). https://doi.org/10.1016/j.ijplas.2023.103529
Lee, Seunghyeon, Cho, Hansohl, Bronkhorst, Curt A., et al., "Deformation, dislocation evolution and the non-Schmid effect in body-centered-cubic single- and polycrystal tantalum," International Journal of Plasticity 163, no. N/A (2023), https://doi.org/10.1016/j.ijplas.2023.103529
@article{osti_1968691,
author = {Lee, Seunghyeon and Cho, Hansohl and Bronkhorst, Curt A. and Pokharel, Reeju and Brown, Donald W. and Clausen, Bjørn and Vogel, Sven C. and Anghel, Veronica and Gray, George T. and Mayeur, Jason R.},
title = {Deformation, dislocation evolution and the non-Schmid effect in body-centered-cubic single- and polycrystal tantalum},
annote = {A physically-informed continuum crystal plasticity model is presented to elucidate deformation mechanisms, dislocation evolution and the non-Schmid effect in body-centered-cubic (bcc) tantalum widely used as a key structural material for mechanical and thermal extremes. We show the unified structural modeling framework informed by mesoscopic dislocation dynamics simulations is capable of capturing salient features of the large inelastic behavior of tantalum at quasi-static (10-3 s-1) to extreme strain rates (5000 s-1) and at low (77 K) to high temperatures (873 K) at both single- and polycrystal levels. Here we also present predictive capabilities of the model for microstructural evolution in the material. To this end, we investigate the effects of dislocation interactions on slip activities, instability and the non-Schmid behavior at the single crystal level. Furthermore, ex situ measurements on crystallographic texture evolution and dislocation density growth are carried out for polycrystal tantalum specimens at increasing strains. Numerical simulation results also support that the modeling framework is capable of capturing the main features of the polycrystal behavior over a wide range of strains, strain rates and temperatures. The theoretical, experimental and numerical results at both single- and polycrystal levels provide critical insight into the underlying physical pictures for micro- and macroscopic responses and their relations in this important class of refractory bcc materials undergoing large inelastic deformations.},
doi = {10.1016/j.ijplas.2023.103529},
url = {https://www.osti.gov/biblio/1968691},
journal = {International Journal of Plasticity},
issn = {ISSN 0749-6419},
number = {N/A},
volume = {163},
place = {United States},
publisher = {Elsevier},
year = {2023},
month = {01}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 515, Issue 3https://doi.org/10.1016/j.nima.2003.05.001