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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F13%3A00398843%21RIV14-AV0-68081723
rdf:type
skos:Concept n13:Vysledek
dcterms:description
An equiatomic CoCrFeMnNi high-entropy alloy, which crystallizes in the face-centered cubic (fcc) crystal structure, was produced by arc melting and drop casting. The drop-cast ingots were homogenized, cold rolled and recrystallized to obtain single-phase microstructures with three different grain sizes in the range 4-160 um. Quasi-static tensile tests at an engineering strain rate of 10(-3) s(-1) were then performed at temperatures between 77 and 1073 K. Yield strength, ultimate tensile strength and elongation to fracture all increased with decreasing temperature. During the initial stages of plasticity (up to similar to 2% strain), deformation occurs by planar dislocation glide on the normal fcc slip system, {1 1 1} < 1 1 0 >, at all the temperatures and grain sizes investigated. At later stages (similar to 20% strain), nanoscale deformation twins were observed after interrupted tests at 77 K. Related work hardening prevents the early onset of necking instability and is a reason for the enhanced ductility observed at 77 K. Since strong temperature dependencies of yield strength are also seen in binary fcc solid solution alloys, it may be an inherent solute effect, which needs further study. An equiatomic CoCrFeMnNi high-entropy alloy, which crystallizes in the face-centered cubic (fcc) crystal structure, was produced by arc melting and drop casting. The drop-cast ingots were homogenized, cold rolled and recrystallized to obtain single-phase microstructures with three different grain sizes in the range 4-160 um. Quasi-static tensile tests at an engineering strain rate of 10(-3) s(-1) were then performed at temperatures between 77 and 1073 K. Yield strength, ultimate tensile strength and elongation to fracture all increased with decreasing temperature. During the initial stages of plasticity (up to similar to 2% strain), deformation occurs by planar dislocation glide on the normal fcc slip system, {1 1 1} < 1 1 0 >, at all the temperatures and grain sizes investigated. At later stages (similar to 20% strain), nanoscale deformation twins were observed after interrupted tests at 77 K. Related work hardening prevents the early onset of necking instability and is a reason for the enhanced ductility observed at 77 K. Since strong temperature dependencies of yield strength are also seen in binary fcc solid solution alloys, it may be an inherent solute effect, which needs further study.
dcterms:title
The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy
skos:prefLabel
The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy
skos:notation
RIV/68081723:_____/13:00398843!RIV14-AV0-68081723
n13:predkladatel
n14:ico%3A68081723
n3:aktivita
n12:I
n3:aktivity
I
n3:cisloPeriodika
15
n3:dodaniDat
n17:2014
n3:domaciTvurceVysledku
n7:5076633
n3:druhVysledku
n15:J
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
80062
n3:idVysledku
RIV/68081723:_____/13:00398843
n3:jazykVysledku
n16:eng
n3:klicovaSlova
high-entropy alloys; mechanical properties; deformation twinning; yield strength; temperature dependence
n3:klicoveSlovo
n4:high-entropy%20alloys n4:yield%20strength n4:deformation%20twinning n4:temperature%20dependence n4:mechanical%20properties
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[67C60D7EDDC0]
n3:nazevZdroje
Acta Materialia
n3:obor
n5:JG
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
6
n3:rokUplatneniVysledku
n17:2013
n3:svazekPeriodika
61
n3:tvurceVysledku
George, E. P. Eggeler, G. Bei, H. Otto, F. Somsen, C. Dlouhý, Antonín
n3:wos
000323801500019
s:issn
1359-6454
s:numberOfPages
13
n11:doi
10.1016/j.actamat.2013.06.018