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dc.contributor.authorDutkiewicz, Jan
dc.contributor.authorRusz, Stanislav
dc.contributor.authorKuc, Dariusz
dc.contributor.authorHilšer, Ondřej
dc.contributor.authorPalka, Pawel
dc.contributor.authorBoczkal, Grzegorz
dc.date.accessioned2018-01-08T08:51:36Z
dc.date.available2018-01-08T08:51:36Z
dc.date.issued2017
dc.identifier.citationActa Metallurgica Slovaca. 2017, vol. 23, no. 3, p. 215-221.cs
dc.identifier.issn1335-1532
dc.identifier.issn1338-1156
dc.identifier.urihttp://hdl.handle.net/10084/122713
dc.description.abstractMagnesium based alloy containing 9 wt. % Li, 1,5 wt. % Al, composed of alpha + beta (hcp + bcc) phases was cast under argon atmosphere and extruded at 350 degrees C as bars of cross section 12x12 mm. Twist Channel Angular Pressing TCAP deformation was applied at a temperature of 160 degrees 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 gamma = 30 degrees to simulate back pressure and thus to increase the extrusion force. The initial grain size of the hexagonal. phase estimated at 30 mu m decreased in the following passes down to 6 mu m and that of bcc. phase decreased after TCAP from initial 12 mu m, down to 5 mu m. TEM studies after TCAP passes showed higher dislocation density in the. region than in the alpha phase. Crystallographic relationship (001) alpha || (110) beta 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 degrees 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.cs
dc.format.extent565767 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoencs
dc.publisherTechnická univerzita Košice, Hutnícka fakultacs
dc.relation.ispartofseriesActa Metallurgica Slovacacs
dc.relation.urihttp://dx.doi.org/10.12776/ams.v23i3.987cs
dc.rightsThis journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.cs
dc.subjectMgLiAl alloyscs
dc.subjectsuperplastic formingcs
dc.subjectTEMcs
dc.titleSuperplastic deformation of two phase MgLiAl alloy after TCAP pressingcs
dc.typearticlecs
dc.identifier.doi10.12776/ams.v23i3.987
dc.rights.accessopenAccesscs
dc.type.versionpublishedVersioncs
dc.type.statusPeer-reviewedcs
dc.description.sourceWeb of Sciencecs
dc.description.volume23cs
dc.description.issue3cs
dc.description.lastpage221cs
dc.description.firstpage215cs
dc.identifier.wos000418606000002


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