Creep study of mechanisms involved in low-temperature superplasticity of UFG Ti-6Al-4V processed by SPD
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F16%3A00463463" target="_blank" >RIV/68081723:_____/16:00463463 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.matchar.2016.04.007" target="_blank" >http://dx.doi.org/10.1016/j.matchar.2016.04.007</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.matchar.2016.04.007" target="_blank" >10.1016/j.matchar.2016.04.007</a>
Alternative languages
Result language
angličtina
Original language name
Creep study of mechanisms involved in low-temperature superplasticity of UFG Ti-6Al-4V processed by SPD
Original language description
The deformation kinetics of ultrafine-grained Ti-6Al-4V with mean (sub)grain size about 150 nm (produced by isothermal multiaxial forging) and superplastic properties at the relatively low temperature of 873 K was investigated in compression and tension over a large range of strain rates from 10- 7 to 10- 2 s- 1. Electron microscopic observations showed that the grains coarsen during deformation towards the quasi-stationary spacing wqs of strain induced boundaries. In spite of the grain coarsening the grains were generally smaller than wqs allowing high-angle boundaries to dominate the quasi-stationary strength. Texture measurements indicate that dislocation glide plays a large role in deformation. Glide in this alloy is significantly influenced by solid solution strengthening leading to a stress sensitivity of strain rate of n = 3. The present ultrafine-grained Ti alloy displays a stress sensitivity exponent n = 2 over an extended stress range where its superplastic behavior is optimal. While the deformation kinetics of present ultrafine-grained Ti alloy can be roughly explained by the traditional formula for superplastic flow, the significant discrepancy to the measured values suggests that solid solution strengthening must be taken into account to get a complete insight. © 2016 Elsevier Inc. All rights reserved.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JG - Metallurgy, metal materials
OECD FORD branch
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Result continuities
Project
<a href="/en/project/ED1.1.00%2F02.0068" target="_blank" >ED1.1.00/02.0068: Central european institute of technology</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Materials Characterization
ISSN
1044-5803
e-ISSN
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Volume of the periodical
116
Issue of the periodical within the volume
JUN
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
84-90
UT code for WoS article
000376698800011
EID of the result in the Scopus database
2-s2.0-84964526668