Superplastic deformation of two phase MgLiAl alloy after TCAP pressing

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Superplastic deformation of two phase MgLiAl alloy after TCAP pressing

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Superplastic deformation of two phase MgLiAl alloy after TCAP pressing

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Metallurgica Slovaca

ISSN

1335-1532

e-ISSN

—

Svazek periodika

23

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

SK - Slovenská republika

Počet stran výsledku

7

Strana od-do

215-221

Kód UT WoS článku

000418606000002

EID výsledku v databázi Scopus

2-s2.0-85030644433