About: Microstructure stability of ultra-fine grained magnesium alloy AZ31 processed by extrusion and equal-channel angular pressing (EX-ECAP)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1016/j.matchar.2014.05.013
Description	Thermal stability of the ultra-fine grained (UFG) microstructure of magnesium AZ31 alloy was investigated. UFG microstructure was achieved by a combined two-step severe plastic deformation process: the extrusion (EX) and subsequent equal-channel angular pressing (ECAP). This combined process leads to refined microstructure and enhanced microhardness. Specimens with UFG microstructure were annealed isochronally at temperatures 150-500 degrees C for 1 h. The evolution of microstructure, mechanical properties and dislocation density was studied by electron backscatter diffraction (EBSD), microhardness measurements and positron annihilation spectroscopy (PAS). The coarsening of the fine-grained structure at higher temperatures was accompanied by a gradual decrease of the microhardness and decrease of dislocation density. Mechanism of grain growth was studied by general equation for grain growth and Arrhenius equation. Activation energies for grain growth were calculated to be 115, 33 and 164 kJ/mol in temperature ranges of 170-210 degrees C, 210-400 degrees C and 400-500 degrees C (443-483 K, 483-673 K and 673-773 K), respectively. Thermal stability of the ultra-fine grained (UFG) microstructure of magnesium AZ31 alloy was investigated. UFG microstructure was achieved by a combined two-step severe plastic deformation process: the extrusion (EX) and subsequent equal-channel angular pressing (ECAP). This combined process leads to refined microstructure and enhanced microhardness. Specimens with UFG microstructure were annealed isochronally at temperatures 150-500 degrees C for 1 h. The evolution of microstructure, mechanical properties and dislocation density was studied by electron backscatter diffraction (EBSD), microhardness measurements and positron annihilation spectroscopy (PAS). The coarsening of the fine-grained structure at higher temperatures was accompanied by a gradual decrease of the microhardness and decrease of dislocation density. Mechanism of grain growth was studied by general equation for grain growth and Arrhenius equation. Activation energies for grain growth were calculated to be 115, 33 and 164 kJ/mol in temperature ranges of 170-210 degrees C, 210-400 degrees C and 400-500 degrees C (443-483 K, 483-673 K and 673-773 K), respectively. (en)
Title	Microstructure stability of ultra-fine grained magnesium alloy AZ31 processed by extrusion and equal-channel angular pressing (EX-ECAP) Microstructure stability of ultra-fine grained magnesium alloy AZ31 processed by extrusion and equal-channel angular pressing (EX-ECAP) (en)
skos:prefLabel	Microstructure stability of ultra-fine grained magnesium alloy AZ31 processed by extrusion and equal-channel angular pressing (EX-ECAP) Microstructure stability of ultra-fine grained magnesium alloy AZ31 processed by extrusion and equal-channel angular pressing (EX-ECAP) (en)
skos:notation	RIV/00216208:11320/14:10286337!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	I P S
http://linked.open...avai/riv/aktivity	I, P(GA13-13616S), S
http://linked.open...iv/cisloPeriodika	-
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Stráský, Josef Janeček, Miloš Čížek, Jakub Vrátná, Jitka
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	29274
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10286337
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	AZ31 magnesium alloy; Equal-channel angular pressing (ECAP); Ultrafine-grained (UFG) materials; Severe plastic deformation (SPD); Microstructure stability (en)
http://linked.open.../riv/klicoveSlovo	Equal-channel angular pressing (ECAP) Microstructure stability Ultrafine-grained (UFG) materials Severe plastic deformation (SPD) AZ31 magnesium alloy
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[C92A79A5DBB4]
http://linked.open...i/riv/nazevZdroje	Materials Characterization
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Evaluation of Elastic Properties of Materials Processed by Severe Plastic Deformation
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	94
http://linked.open...iv/tvurceVysledku	Janeček, Miloš Čížek, Jakub Stráský, Josef Hadzima, Branislav Stráská, Jitka
http://linked.open...ain/vavai/riv/wos	000339696000009
issn	1044-5803
number of pages	11 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.matchar.2014.05.013
http://localhost/t...ganizacniJednotka	11320

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