Abstract
In order to reveal the high-velocity deformation mechanisms of Ti-6Al-4V titanium alloy sheets, the dynamic deformation behavior and the microstructure evolutions were compared with those under quasi-static case employing Scanning electron microscopy/Electron back-scattered diffraction (SEM/EBSD) and Transmission electron microscopy (TEM). The results indicated that the distribution of microhardness was uneven. The cause was determined to be the non-uniform material flow and dynamic loading. The grain sizes of the Ti- 6Al-4V titanium alloy sheet were nearly the same under two conditions, but the grains were elongated under the dynamic loading compared with that observed in quasi-static forming. In high-velocity bulging, dislocation slip was the principle mechanism of plastic deformation of Ti-6Al-4V titanium alloy when deformation was small. As the strain increased, the twinning phenomenon was activated in addition to the dislocation cell structure. The twinning plane was determined to be the (10 11) plane.
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Recommended by Associate Editor Dae-Cheol Ko
Fen-Qiang Li, Ph.D., is a Researcher on material processing and material analysis. His research focuses on the electromagnetic forming (EMF) process and the deformation mechanism of material under EMF.
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Li, FQ., Zhao, J., Mo, JH. et al. Comparative study of the microstructure of Ti-6Al-4V titanium alloy sheets under quasi-static and high-velocity bulging. J Mech Sci Technol 31, 1349–1356 (2017). https://doi.org/10.1007/s12206-016-0843-9
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DOI: https://doi.org/10.1007/s12206-016-0843-9