Journal
MATERIALS CHARACTERIZATION
Volume 102, Issue -, Pages 103-113Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.02.017
Keywords
Adiabatic shear band; Beta titanium alloy; Grain refinement mechanism; TEM
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Funding
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201207]
- Queensland Centre for Advanced Material Processing and Manufacturing (AMPAM)
- Defence Materials Technology Centre (DMTC)
- China Scholarship Council
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The microstructural evolution and grain refinement within adiabatic shear bands in the Ti6554 alloy deformed at high strain rates and elevated temperatures have been characterized using transmission electron microscopy. No stress drops were observed in the corresponding stress-strain curve, indicating that the initiation of adiabatic shear bands does not lead to the loss of load capacity for the Ti6554 alloy. The outer region of the shear bands mainly consists of cell structures bounded by dislocation clusters. Equiaxed subgrains in the core area of the shear band can be evolved from the subdivision of cell structures or reconstruction and transverse segmentation of dislocation clusters. It is proposed that dislocation activity dominates the grain refinement process. The rotational recrystallization mechanism may operate as the kinetic requirements for it are fulfilled. The coexistence of different substructures across the shear bands implies that the microstructural evolution inside the shear bands is not homogeneous and different grain refinement mechanisms may operate simultaneously to refine the structure. (C) 2015 Elsevier Inc. All rights reserved.
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