Shear banding-activated dynamic recrystallization and phase transformation during quasi-static loading of β-metastable Ti – 12 wt % Mo alloy
(2022) Acta Materialia — Vol. 235, p. 118088 (2022)
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- Authors
Marteleur, Matthieu 
Kashiwar, Ankush
- Abstract
- Dynamic recrystallization (DRX) within adiabatic shear bands forming during the fracture of TRIP-TWIP β−metastable Ti-12Mo (wt %) alloy was recently reported. The formation of 1-3 µm thick-adiabatic shear bands, and of dynamic recrystallization, was quite surprising as their occurrence generally requires high temperature and/or high strain rate loading while these samples were loaded in quasi-static conditions at room temperature. To better understand the fracture mechanism and associated microstructural evolution, thin foils representative of different stages of the fracture process were machined from the fracture surface by Focused Ion Beam (FIB) and analyzed by Transmission Electron Microscopy (TEM) and Automated Crystal Orientation mapping (ACOM-TEM). Complex microstructure transformations involving severe plastic deformed nano-structuration, crystalline rotation and local precipitation of the ω_ath phase were identified. The spatial and temporal evolution of the microstructure during the propagation of the crack was explained through dynamic recovery and continuous dynamic recrystallization, and linked to the modelled distribution of temperature and strain level where TEM samples were extracted.
- Affiliations
University of Antwerp Electron Microscopy for Materials Science (EMAT) Nanjing Tech University Now at: Key laboratory for Light-weight Materials
Citations
Choisez, L., Ding, L., Marteleur, M., Kashiwar, A., Idrissi, H., & Jacques, P. (2022). Shear banding-activated dynamic recrystallization and phase transformation during quasi-static loading of β-metastable Ti – 12 wt % Mo alloy. Acta Materialia, 235, 118088. https://hdl.handle.net/2078.5/269136 (Original work published 2022)