Abstract
Electrically assisted forming brings many advantages to the forming processes of metal alloys through microstructure modification by a flowing current. However, the influence of strain rate on these changes and the real value of the stress-drop are not yet specified. In this study, the effect of strain rate on flow stress, material plasticity and, microstructure was analysed for the electrically assisted tension of the 5754-H111 aluminium alloy. Three different strain rates (0.0025, 0.01, and 0.04 s−1) were applied under a pulsed electric current tension. The study showed that at decreasing strain rate, an increase in engineering strain is observed. This effect was explained by the periodic strain-hardening and annealing of the sample under a pulsed electric current. The study also showed the possibility of determining the real value of stress-drop, which occurred when a pulsed current was applied during tension. Finally, applying the current pulses led to a meaningful increase in the material plasticity. Transmission electron microscopy and electron backscatter diffraction were used to identify the microstructural changes. It was shown applying pulsed current allowed a change of the dislocation pattern and its annihilation, resulting from the dynamic recovery process.
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This work was supported by the National Science Centre (Grant. No. 2022/45/N/ST8/03048).
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Conceptualization: DD; Investigation: DD, MZ, MD; Methodology: DD, ZZ; Validation: ZZ, MZ, MD; Visualization: DD; Writing-Original Draft: DD; Writing-Review and Editing: ZZ, MZ, MD
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Dobras, D., Zimniak, Z., Zwierzchowski, M. et al. Effect of Strain Rate on the Mechanical Behavior of Al-Mg Alloy Under a Pulsed Electric Current. Metall Mater Trans A 55, 1284–1294 (2024). https://doi.org/10.1007/s11661-024-07335-6
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DOI: https://doi.org/10.1007/s11661-024-07335-6