The optimization of ECAP conditions to achieve high strain-rate superplasticity in a Zr- and Sc-modified AA 7075 aluminum alloy
Result description
An AA 7075 aluminum alloy with Zr and Sc additions was subjected to 6-8 ECAP passes at 120, 170, and 220 °C in order to examine the effect of the pressing conditions on the microstructural characteristics and the consequences for high-temperature mechanical properties. Using the method of EBSD, a decrease in pressing temperature was found to lead to a more pronounced refinement of the microstructure and a higher fraction of high-angle grain boundaries, but at the same time compromised the ability of theAl3 (Zr, Sc) phase to stabilize the ultra-fine-grained microstructure at elevated temperatures. Optimum superplastic properties were therefore achieved after pressing at the intermediate temperature of 170 °C. The material exhibited high strain-rate superplasticity with a ductility of 650 % at an initial strain rate of 1 x 10-1 s-1.
Keywords
optimizationconditionsachievestrain-ratesuperplasticitySc-modifiedaluminumalloy
The result's identifiers
Result code in IS VaVaI
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
The optimization of ECAP conditions to achieve high strain-rate superplasticity in a Zr- and Sc-modified AA 7075 aluminum alloy
Original language description
An AA 7075 aluminum alloy with Zr and Sc additions was subjected to 6-8 ECAP passes at 120, 170, and 220 °C in order to examine the effect of the pressing conditions on the microstructural characteristics and the consequences for high-temperature mechanical properties. Using the method of EBSD, a decrease in pressing temperature was found to lead to a more pronounced refinement of the microstructure and a higher fraction of high-angle grain boundaries, but at the same time compromised the ability of theAl3 (Zr, Sc) phase to stabilize the ultra-fine-grained microstructure at elevated temperatures. Optimum superplastic properties were therefore achieved after pressing at the intermediate temperature of 170 °C. The material exhibited high strain-rate superplasticity with a ductility of 650 % at an initial strain rate of 1 x 10-1 s-1.
Czech name
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Czech description
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Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2009
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Materials Research
ISSN
1862-5282
e-ISSN
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Volume of the periodical
100
Issue of the periodical within the volume
6
Country of publishing house
DE - GERMANY
Number of pages
7
Pages from-to
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UT code for WoS article
000267933300024
EID of the result in the Scopus database
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Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
BM - Solid-state physics and magnetism
Year of implementation
2009