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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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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
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
Divisions: Faculty of Science > 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:
DateEvent
June 2021Published
29 June 2021Available
24 December 2020Accepted
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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