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Shear localization behavior in the hat-shaped specimen of near-α Ti-6Al-2Zr-1Mo-1V titanium alloy loaded at a high strain rate
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Du, Yuxuan, Yang, Xinliang, Li, Zushu, Hao, Fang, Mao, Youchuang, Li, Shaoqiang, Liu, Xianghong, Feng, Yong and Yan, Zhiming (2021) Shear localization behavior in the hat-shaped specimen of near-α Ti-6Al-2Zr-1Mo-1V titanium alloy loaded at a high strain rate. Transactions of Nonferrous Metals Society of China, 31 (6). pp. 1641-1655. doi:10.1016/S1003-6326(21)65604-2
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Official URL: https://doi.org/10.1016/S1003-6326(21)65604-2
Abstract
The microstructure characteristics in early stage shear localization of near-α Ti−6Al−2Zr−1Mo−1V titanium alloy were investigated by split Hopkinson pressure bar (SHPB) tests using hat-shaped specimens. The microstructural evolution and deformation mechanisms of hat-shaped specimens were revealed by electron backscattered diffraction (EBSD) method. It is found that the nucleation and expansion of adiabatic shear band (ASB) are affected by both geometric and structural factors. The increase of dislocation density, structure fragment and temperature rise in the deformation-affected regions provide basic microstructural conditions. In addition to the dislocation slips, the extension twins detected in shear region also play a critical role in microstructural fragmentation due to twin-boundaries effect. Interestingly, the sandwich structure imposes a crucial influence on ASB, which finally becomes a mature wide ASB in the dynamic deformation. However, due to much larger width, the sandwich structure in the middle of shear region is also possible to serve as favorable nucleation sites for crack initiation.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery T Technology > TN Mining engineering. Metallurgy |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Library of Congress Subject Headings (LCSH): | Shear (Mechanics), Titanium alloys , Titanium alloys -- Fatigue , Pressure gages, Strains and stresses, Electrons -- Backscattering , Electrons -- Diffraction | ||||||||
| Journal or Publication Title: | Transactions of Nonferrous Metals Society of China | ||||||||
| Publisher: | Elsevier | ||||||||
| ISSN: | 1003-6326 | ||||||||
| Official Date: | June 2021 | ||||||||
| Dates: |
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| Volume: | 31 | ||||||||
| Number: | 6 | ||||||||
| Page Range: | pp. 1641-1655 | ||||||||
| DOI: | 10.1016/S1003-6326(21)65604-2 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access | ||||||||
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