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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F12%3A00385908%21RIV13-GA0-68081723
rdf:type
n10:Vysledek skos:Concept
dcterms:description
Equal-channel angular pressing (ECAP) was conducted at room temperature and extrusion passes were processed by route Bc up to 12 passes. Tensile creep tests were performed at 473 K, 573 K and 673 K at different constant applied stresses. It was observed that the original coarse grain size of unprocessed alloy was reduced to 0.3 µm after 8 ECAP passes and the grain growth during creep was restricted by precipitates with the mean diameter 4.0 nm. No significant effect on creep resistance was found after one ECAP pass at 473 and 573 K. However, the longest time to fracture was exhibited by alloy after 2 ECAP passes at 573 and 673 K but with further increasing number of ECAP passes a decrease in the time to fracture was observed. Nevertheless, the beneficial effect of ECAP on creep resistance was still documented after 8 passes for temperatures of 473 and 573 K. By contrast, creep tests performed at 673 K showed that the time to fracture of UFG material is shorter as compared with that for as-received state. The 3 D laser measurement of surface showed that the creep fracture process is accelerated by formation of vertical surface step relief and cavitation at the intersection of the shear bands during creep. Equal-channel angular pressing (ECAP) was conducted at room temperature and extrusion passes were processed by route Bc up to 12 passes. Tensile creep tests were performed at 473 K, 573 K and 673 K at different constant applied stresses. It was observed that the original coarse grain size of unprocessed alloy was reduced to 0.3 µm after 8 ECAP passes and the grain growth during creep was restricted by precipitates with the mean diameter 4.0 nm. No significant effect on creep resistance was found after one ECAP pass at 473 and 573 K. However, the longest time to fracture was exhibited by alloy after 2 ECAP passes at 573 and 673 K but with further increasing number of ECAP passes a decrease in the time to fracture was observed. Nevertheless, the beneficial effect of ECAP on creep resistance was still documented after 8 passes for temperatures of 473 and 573 K. By contrast, creep tests performed at 673 K showed that the time to fracture of UFG material is shorter as compared with that for as-received state. The 3 D laser measurement of surface showed that the creep fracture process is accelerated by formation of vertical surface step relief and cavitation at the intersection of the shear bands during creep.
dcterms:title
Microstructure Mechanisms Governing the Creep Life of Ultrafine-grained Cu-0.2wt.%Zr Alloy Microstructure Mechanisms Governing the Creep Life of Ultrafine-grained Cu-0.2wt.%Zr Alloy
skos:prefLabel
Microstructure Mechanisms Governing the Creep Life of Ultrafine-grained Cu-0.2wt.%Zr Alloy Microstructure Mechanisms Governing the Creep Life of Ultrafine-grained Cu-0.2wt.%Zr Alloy
skos:notation
RIV/68081723:_____/12:00385908!RIV13-GA0-68081723
n10:predkladatel
n11:ico%3A68081723
n3:aktivita
n9:P n9:Z
n3:aktivity
P(GAP108/11/2260), Z(AV0Z20410507)
n3:cisloPeriodika
3
n3:dodaniDat
n14:2013
n3:domaciTvurceVysledku
n16:1102303 n16:7024819 n16:7393776 n16:8093326 n16:8144036
n3:druhVysledku
n6:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n8:predkladatel
n3:idSjednocenehoVysledku
150435
n3:idVysledku
RIV/68081723:_____/12:00385908
n3:jazykVysledku
n18:eng
n3:klicovaSlova
equal-channel angular pressing; creep behaviour; ultrafine-grained materials
n3:klicoveSlovo
n7:creep%20behaviour n7:equal-channel%20angular%20pressing n7:ultrafine-grained%20materials
n3:kodStatuVydavatele
PL - Polská republika
n3:kontrolniKodProRIV
[7AE3AD37EC4A]
n3:nazevZdroje
Acta Physica Polonica. A
n3:obor
n12:JJ
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
5
n3:projekt
n17:GAP108%2F11%2F2260
n3:rokUplatneniVysledku
n14:2012
n3:svazekPeriodika
122
n3:tvurceVysledku
Sklenička, Václav Svoboda, Milan Král, Petr Kvapilová, Marie Dvořák, Jiří
n3:wos
000309019200009
n3:zamer
n19:AV0Z20410507
s:issn
0587-4246
s:numberOfPages
4