The dynamic response of a β titanium alloy to high strain rates and elevated temperatures

Hongyi Zhan; Damon Kent; Gui Wang; Matthew S Dargusch

doi:10.1016/j.msea.2014.04.028

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The dynamic response of a β titanium alloy to high strain rates and elevated temperatures

Journal article

Open access

Peer reviewed

The dynamic response of a β titanium alloy to high strain rates and elevated temperatures

Hongyi Zhan, Damon Kent, Gui Wang and Matthew S Dargusch

Materials Science & Engineering A, Vol.607, pp.417-426

2014

DOI: https://doi.org/10.1016/j.msea.2014.04.028

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Abstract

Materials Engineering

Mechanical Engineering

titanium alloys

precipitation

shear bands

Split Hopkinson Pressure Bar

flow softening

The stress-strain behaviour and microstructural evolution of the Ti-6Cr-5Mo-5V-4Al (Ti6554) alloy was systematically investigated using Split Hopkinson Pressure Bar (SHPB) tests over a wide range of strain rates from 1000 s-1 to 10,000 s-1 and initial temperatures from 293 K to 1173 K. Dislocation slip is the main deformation mechanism for plastic flow of the Ti6554 alloy at high strain rates. The flow stress increases with increasing strain rate and decreasing temperature. Also the flow stress is more sensitive to temperature than to strain rate. For high strain rate deformations, the strain hardening rate is found to be negative at 293 K and increases with increasing temperatures. Flow softening observed at 293 K is potentially caused by adiabatic heating. The increment in the strain hardening rate with increasing temperatures may be the result of interactions between thermally activated solute Cr atoms and mobile dislocations. When the temperature is raised to 873 K, a novel α precipitate morphology consisting of globular α aligned in strings was observed in specimens deformed at strain rates of 4000 and 10,000 s-1. It has hardening effects on the β matrix and is purported to nucleate on dislocations introduced by the high strain rate deformation. Adiabatic shear bands were observed in specimens deformed at higher temperatures (873 K). The microstructure inside the shear bands is harder than that outside of the shear bands in the Ti6554 alloy.

Details

Title: The dynamic response of a β titanium alloy to high strain rates and elevated temperatures
Authors: Hongyi Zhan (Author) - University of Queensland
Damon Kent (Author) - University of Queensland
Gui Wang (Author) - University of Queensland
Matthew S Dargusch (Author) - The University of Queensland
Publication details: Materials Science & Engineering A, Vol.607, pp.417-426
Publisher: Elsevier BV
Date published: 2014
DOI: 10.1016/j.msea.2014.04.028
ISSN: 0921-5093
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99449835102621
Output Type: Journal article

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Collaboration types: Industry collaboration; Domestic collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Nanoscience & Nanotechnology

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