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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F14%3A10286337%21RIV15-MSM-11320___
rdf:type
skos:Concept n16:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.matchar.2014.05.013
dcterms: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.
dcterms: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)
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)
skos:notation
RIV/00216208:11320/14:10286337!RIV15-MSM-11320___
n4:aktivita
n6:I n6:S n6:P
n4:aktivity
I, P(GA13-13616S), S
n4:cisloPeriodika
-
n4:dodaniDat
n5:2015
n4:domaciTvurceVysledku
n14:5345553 n14:2958244 n14:9739920 n14:9949097
n4:druhVysledku
n12:J
n4:duvernostUdaju
n20:S
n4:entitaPredkladatele
n10:predkladatel
n4:idSjednocenehoVysledku
29274
n4:idVysledku
RIV/00216208:11320/14:10286337
n4:jazykVysledku
n11:eng
n4:klicovaSlova
AZ31 magnesium alloy; Equal-channel angular pressing (ECAP); Ultrafine-grained (UFG) materials; Severe plastic deformation (SPD); Microstructure stability
n4:klicoveSlovo
n8:Microstructure%20stability n8:Equal-channel%20angular%20pressing%20%28ECAP%29 n8:AZ31%20magnesium%20alloy n8:Severe%20plastic%20deformation%20%28SPD%29 n8:Ultrafine-grained%20%28UFG%29%20materials
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[C92A79A5DBB4]
n4:nazevZdroje
Materials Characterization
n4:obor
n19:BM
n4:pocetDomacichTvurcuVysledku
4
n4:pocetTvurcuVysledku
5
n4:projekt
n15:GA13-13616S
n4:rokUplatneniVysledku
n5:2014
n4:svazekPeriodika
94
n4:tvurceVysledku
Stráský, Josef Hadzima, Branislav Čížek, Jakub Stráská, Jitka Janeček, Miloš
n4:wos
000339696000009
s:issn
1044-5803
s:numberOfPages
11
n13:doi
10.1016/j.matchar.2014.05.013
n18:organizacniJednotka
11320