Microstructural characteristics of adiabatic shear localization in a metastable beta titanium alloy deformed at high strain rate and elevated temperatures

Hongyi Zhan; Weidong Zeng; Gui Wang; Damon Kent; Matthew Dargusch

doi:10.1016/j.matchar.2015.02.017

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Microstructural characteristics of adiabatic shear localization in a metastable beta titanium alloy deformed at high strain rate and elevated temperatures

Journal article

Open access

Peer reviewed

Microstructural characteristics of adiabatic shear localization in a metastable beta titanium alloy deformed at high strain rate and elevated temperatures

Hongyi Zhan, Weidong Zeng, Gui Wang, Damon Kent and Matthew Dargusch

Materials Characterization, Vol.150, pp.103-113

2015

DOI: https://doi.org/10.1016/j.matchar.2015.02.017

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Abstract

adiabatic shear band

beta titanium alloy

grain refinement mechanism

TEM

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 consist 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.

Details

Title: Microstructural characteristics of adiabatic shear localization in a metastable beta titanium alloy deformed at high strain rate and elevated temperatures
Authors: Hongyi Zhan (Author) - University of Queensland
Weidong Zeng (Author) - Northwestern Polytechnical University, China
Gui Wang (Author) - University of Queensland
Damon Kent (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Matthew Dargusch (Author) - University of Queensland
Publication details: Materials Characterization, Vol.150, pp.103-113
Publisher: Elsevier Inc.
Date published: 2015
DOI: 10.1016/j.matchar.2015.02.017
ISSN: 1044-5803
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450052902621
Output Type: Journal article

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Collaboration types: Industry collaboration; Domestic collaboration; International collaboration
Web Of Science research areas: Materials Science, Characterization & Testing; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

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