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

Zhan, Hongyi, Kent, Damon, Wang, Gui and Dargusch, Matthew S. (2014) The dynamic response of a β titanium alloy to high strain rates and elevated temperatures. Materials Science and Engineering A, 607 417-426. doi:10.1016/j.msea.2014.04.028

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Author Zhan, Hongyi
Kent, Damon
Wang, Gui
Dargusch, Matthew S.
Title The dynamic response of a β titanium alloy to high strain rates and elevated temperatures
Journal name Materials Science and Engineering A   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2014-06-23
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.msea.2014.04.028
Open Access Status
Volume 607
Start page 417
End page 426
Total pages 10
Place of publication Lausanne, Switzerland
Publisher Elsevier BV
Collection year 2015
Language eng
Subject 2500 Materials Science
3104 Condensed Matter Physics
2210 Mechanical Engineering
2211 Mechanics of Materials
Abstract 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 1000s-1 to 10,000s-1 and initial temperatures from 293K to 1173K. 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 293K and increases with increasing temperatures. Flow softening observed at 293K 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 873K, a novel α precipitate morphology consisting of globular α aligned in strings was observed in specimens deformed at strain rates of 4000 and 10,000s-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 (873K). The microstructure inside the shear bands is harder than that outside of the shear bands in the Ti6554 alloy.
Keyword Flow softening
Precipitation
Shear bands
Split hopkinson pressure bar
Titanium alloys
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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