Superplastic deformation of two phase MgLiAl alloy after TCAP pressing
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27230%2F17%3A10236402" target="_blank" >RIV/61989100:27230/17:10236402 - isvavai.cz</a>
Result on the web
<a href="http://www.qip-journal.eu/index.php/ams/article/view/987/859" target="_blank" >http://www.qip-journal.eu/index.php/ams/article/view/987/859</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.12776/ams.v23i3.987" target="_blank" >10.12776/ams.v23i3.987</a>
Alternative languages
Result language
angličtina
Original language name
Superplastic deformation of two phase MgLiAl alloy after TCAP pressing
Original language description
Magnesium based alloy containing 9 wt. % Li, 1,5 wt. % Al, composed of α + β (hcp + bcc) phases was cast under argon atmosphere and extruded at 350oC as bars of cross section 12x12 mm. Twist Channel Angular Pressing TCAP deformation was applied at a temperature of 160°C using BC rotation of samples in the following passes. TCAP tool consisted of helical part in horizontal area of the channel with an angle of lead γ = 30° to simulate back pressure and thus to increase the extrusion force. The initial grain size of the hexagonal α phase estimated at 30 μm decreased in the following passes down to 6 μm and that of bcc β phase decreased after TCAP from initial 12 μm, down to 5 μm. TEM studies after TCAP passes showed higher dislocation density in the β region than in the α phase. Crystallographic relationship (001) α || (110) β indicates parallel positioning of slip planes of both phases due to activation of slip. Electron diffraction indicates increase of grain misorientation with a number of TCAP passes. Stress/strain curves measured at temperature of 200°C show superplastic forming after 1st and 3rd TCAP passes with better superplastic properties with increasing number of passes. Values of strain rate sensitivity coefficient m were calculated at 0.31 after 1 TCAP pass using flow stress values from step strain increase curves. The sample after 3 TCAP passes showed increase of m value up to 0.47 for the strain rate range 10−5−5 x 10−4 s−1. Obtained values are slightly lower than those reported in the literature, however increase of a number of TCAP passes has a positive effect on superplastic properties due to fine grains and increase of their misorientation. © 2017, Technical University of Kosice. All rights reserved.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
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Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Acta Metallurgica Slovaca
ISSN
1335-1532
e-ISSN
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Volume of the periodical
23
Issue of the periodical within the volume
3
Country of publishing house
SK - SLOVAKIA
Number of pages
7
Pages from-to
215-221
UT code for WoS article
000418606000002
EID of the result in the Scopus database
2-s2.0-85030644433