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Deformation Behavior of Ti 2 AlNb‐Based Alloy during Dynamic Compression
Author(s) -
Jiang Haitao,
Zhang Guihua,
Guo Wenqi,
Tian Shiwei,
Lin Hongtao,
Zeng Shangwu
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800281
Subject(s) - materials science , lamellar structure , deformation (meteorology) , deformation mechanism , alloy , flow stress , strain rate , transmission electron microscopy , dislocation , composite material , slip (aerodynamics) , scanning electron microscope , phase (matter) , crystallography , metallurgy , microstructure , thermodynamics , nanotechnology , physics , chemistry , organic chemistry
The dynamic deformation behavior of the Ti–26Al–20Nb–0.5Mo (Ti 2 AlNb‐based) alloy is experimentally investigated from ambient temperature (AT) to 400 °C at a high strain rate of 2000 s −1 . Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to characterize the microstructural evolution during the deformation process. The results show that the flow stress of the Ti 2 AlNb‐based alloy decreases as the deformation temperature increases. The deformation mainly occurs in the O lamellar structure, in which the B2 phase and the α 2 phase play a coordinating role. Under dynamic loading, the lamellar phase break up and globularizes. Grain boundaries, dislocations, and phase interfaces act as dislocation sinks and sources during high strain rate deformation. The deformation mechanism is dominated by dislocation slip.