Abstract
Deformation twinning and dislocation slip in twinning-induced plasticity (TWIP) steels have been shown to depend strongly on the crystal orientation, yet the underlying mechanism is still unclear. Here, we addressed this question by fabricating single crystal micro-pillars with six different crystal orientations in a coarse-grained TWIP steel sample and then conducting compression tests as well as microstructural characterization in these pillars. Depending on the crystal orientation, either twinning or slip dominates the plastic deformation. The critical stresses for twinning and slip were measured to be 147.5 ± 19.2 and 105.4 ± 11.2 MPa, respectively. It is found that the Schmid factors for the leading and trailing partial dislocations on the primary slip plane play a crucial role in the competition between twinning and slip at different orientations. Besides, the occurrence of cross-slip depends on crystal orientation through the Schmid factors for the constriction of extended dislocation cores on the primary slip plane as well as those for cross-slip on the conjugate slip plane.
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Acknowledgments
M.X.H. acknowledges the support from Guangzhou Municipal Science and Technology Project (No. 202007020007), National Natural Science Foundation of China (No. U1764252), National Key Research and Development Program of China (No. 2019YFA0209900), Research Grants Council of Hong Kong (No. R7066-18, 17255016, 17210418).
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Manuscript submitted July 26, 2021; accepted September 4, 2021.
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Liang, Z.Y., Huang, M.X. Effects of Crystal Orientation on Deformation Twinning and Dislocation Slip in Single Crystal Micro-pillars of a Twinning-Induced Plasticity Steel. Metall Mater Trans A 52, 5235–5242 (2021). https://doi.org/10.1007/s11661-021-06460-w
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DOI: https://doi.org/10.1007/s11661-021-06460-w