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- W4225984826 abstract "Much efforts have been made on the studies of the microstructure evolution near adiabatic shear bands (ASBs) in titanium alloys. However, the deeper evolution mechanism is not very clear. Therefore, in the present, the dynamic compression test utilizing split Hopkinson pressure bar at room temperature and a strain rate of ∼3000/s was carried out on a hot-rolled near β-typed Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr alloy, and the microstructures of the central region and the transition region of the adiabatic shear bands were carefully investigated by high-angle annular dark field-scanning transmission electron microscope (HAADF-STEM). It was found that the central region of ASBs was composed of the softening regions (SRs) and the hardening regions (HRs). Moreover, detailed observation indicated that in the SRs, the microstructure consisted of dynamic recrystallization (DRX) grains. While in the HRs, the {11–22}<11-2-3> twin in α grains and the {332}<113> twin in β grains were observed, and a great number of dislocations were accumulated at the interface of twins and parent phases (α and β phases) to form dislocation walls, thus promoting the DRX process in the ASB central region. It illustrated a new DRX mechanism in ASBs. Meanwhile, no twins were found in the ASB transition region. Further research on the average compositions of α and β phases in the HRs of ASBs by energy dispersion spectrum method combined with d-electron theory revealed that the twin in α grains was mainly caused by the severe deformation under dynamic loading, while that in β phase was the result of the instability of β phase." @default.
- W4225984826 created "2022-05-05" @default.
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- W4225984826 date "2022-05-01" @default.
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- W4225984826 title "Influence of twins found in adiabatic shear bands on dynamic recrystallization of a near β Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr alloy" @default.
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- W4225984826 doi "https://doi.org/10.1016/j.msea.2022.143084" @default.
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