Microstructure Evolution and Deformation Mechanism of Tantalum–Tungsten Alloy Liner under Ultra-High Strain Rate by Explosive Detonation

The microstructure evolution and plastic deformation mechanism of a Ta-2.5W liner under the ultra-high-strain-rate conditions generated by the explosive detonation were investigated in this study. For this purpose, a modular soft-recovery apparatus was designed to non-destructively recover the Ta-2....

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Bibliographic Details
Published in:Materials 2022-07, Vol.15 (15), p.5252
Main Authors: Fu, Heng, Jiang, Jianwei, Men, Jianbing, Gu, Xinfu
Format: Article
Language:English
Subjects:
Alloys
Deformation
Deformation mechanisms
Design
Detonation
Dynamic recrystallization
Electron backscatter diffraction
Evolution
Grain boundaries
Grain refinement
High strain rate
Microstructure
Modular design
Nucleation
Plastic deformation
Projectiles
Tantalum
Tungsten base alloys
Velocity
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Summary:The microstructure evolution and plastic deformation mechanism of a Ta-2.5W liner under the ultra-high-strain-rate conditions generated by the explosive detonation were investigated in this study. For this purpose, a modular soft-recovery apparatus was designed to non-destructively recover the Ta-2.5W explosively formed projectile (EFP) in the ballistic endpoint. The electron backscattered diffraction (EBSD) method was employed to examine the microstructure of the Ta-2.5W liner before and after deformation. The microstructure of the recovered EFP exhibited significant grain refinement with preferred fiber texture. The theoretical computation results showed that the temperature of the EFP was in the range of 0.27–0.65 Tm. The deformation mechanism of the Ta-2.5W liner forming EFP driven by the detonation is the continuous dynamic recrystallization (CDRX) induced by high strain deformation, rather than the conventional dynamic recrystallization of nucleation and growth. The new grain structures evolve when the low-angle grain boundaries are transformed into the high-angle grain boundaries, and the specific grain refinement mechanism is the progressive rotation of subgrains near pre-existing grain boundaries.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15155252