Abstract
Twin interactions associated with {11\( \overline{2} \)1} (E2) twins in titanium deformed by high strain rate (~2600 s−1) compression were studied using electron backscatter diffraction technique. Three types of twins, {10\( \overline{1} \)2} (E1), {11\( \overline{2} \)2} (C1), and {11\( \overline{2} \)4} (C3), were observed to interact with the preformed E2 twins in four parent grains. The E1 variants nucleated at twin boundaries of some E2 variants. And the C3 twins were originated from the intersection of C1 and E2. The selection of twin variant was investigated by the Schmid factors (SFs) and the twinning shear displacement gradient tensors (DGTs) calculations. The results show that twin variants that did not follow the Schmid law were more frequently observed under high strain rate deformation than quasi-static deformation. Among these low-SF active variants, 73 pct (8 out of 11) can be interpreted by DGT. Besides, 26 variants that have SF values close to or higher than their active counterparts were absent. Factors that may affect the twin variant selections were discussed.
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Acknowledgments
The authors are happy to acknowledge Dr. Yufei Li and Xianglin Chen for assistance during EBSD sample preparation, and Professor Dongsheng Xu and Yuting Zhang for helpful discussions and suggestions. This research work is financially supported by the subject development fund of the Science and Technology on Surface Physics and Chemistry Laboratory (No. ZDXKFZ201402), the subject development fund of CAEP (No. 2015B0301070) and the fund of the Institute of Materials (No. SJZ201410).
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Manuscript submitted April 21, 2016.
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Zhou, P., Xiao, D., Jiang, C. et al. Twin Interactions in Pure Ti Under High Strain Rate Compression. Metall Mater Trans A 48, 126–138 (2017). https://doi.org/10.1007/s11661-016-3832-9
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DOI: https://doi.org/10.1007/s11661-016-3832-9