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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F11%3A00376005%21RIV12-AV0-68081723
rdf:type
skos:Concept n11:Vysledek
dcterms:description
Phase transformations in binary ultra-fine-grained (UFG) pseudoelastic NiTi wires were studied in a wide temperature range using mechanical loading/unloading experiments, resistance measurements, differential scanning calorimetry (DSC), thermal infrared imaging, and transmission electron microscopy (TEM). The formation of R-phase can be detected in the mechanical experiments. It is shown that the stress-strain response of the R-phase can be isolated from the overall stress-strain data. The R-phase always forms prior to B19´ when good pseudoelastic properties are observed. The stress-induced B2 to R-phase transition occurs in a homogeneous manner, contrary to the localized character of the B2/R to B19´ transformations. The temperature dependence of the critical stress values for the formation of the martensitic phases shows a Clausius Clapeyron type of behavior with constants close to 6 MPa/K (B19´) and 18 MPa/K (R-phase). A stress-temperature map is suggested that summarizes the experimentally observed sequences of elementary transformation/deformation processes. Phase transformations in binary ultra-fine-grained (UFG) pseudoelastic NiTi wires were studied in a wide temperature range using mechanical loading/unloading experiments, resistance measurements, differential scanning calorimetry (DSC), thermal infrared imaging, and transmission electron microscopy (TEM). The formation of R-phase can be detected in the mechanical experiments. It is shown that the stress-strain response of the R-phase can be isolated from the overall stress-strain data. The R-phase always forms prior to B19´ when good pseudoelastic properties are observed. The stress-induced B2 to R-phase transition occurs in a homogeneous manner, contrary to the localized character of the B2/R to B19´ transformations. The temperature dependence of the critical stress values for the formation of the martensitic phases shows a Clausius Clapeyron type of behavior with constants close to 6 MPa/K (B19´) and 18 MPa/K (R-phase). A stress-temperature map is suggested that summarizes the experimentally observed sequences of elementary transformation/deformation processes.
dcterms:title
On the Stress-Induced Formation of R-Phase in Ultra-Fine-Grained Ni-Rich NiTi Shape Memory Alloys On the Stress-Induced Formation of R-Phase in Ultra-Fine-Grained Ni-Rich NiTi Shape Memory Alloys
skos:prefLabel
On the Stress-Induced Formation of R-Phase in Ultra-Fine-Grained Ni-Rich NiTi Shape Memory Alloys On the Stress-Induced Formation of R-Phase in Ultra-Fine-Grained Ni-Rich NiTi Shape Memory Alloys
skos:notation
RIV/68081723:_____/11:00376005!RIV12-AV0-68081723
n11:predkladatel
n15:ico%3A68081723
n3:aktivita
n17:P n17:Z
n3:aktivity
P(GA106/09/1913), Z(AV0Z20410507)
n3:cisloPeriodika
9
n3:dodaniDat
n18:2012
n3:domaciTvurceVysledku
n16:5076633
n3:druhVysledku
n13:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n8:predkladatel
n3:idSjednocenehoVysledku
218292
n3:idVysledku
RIV/68081723:_____/11:00376005
n3:jazykVysledku
n14:eng
n3:klicovaSlova
martensitic transformations; rietveld method; single-crystals
n3:klicoveSlovo
n4:martensitic%20transformations n4:rietveld%20method n4:single-crystals
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[7F0BB95813A0]
n3:nazevZdroje
Metallurgical and Materials Transactions A
n3:obor
n10:JG
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
4
n3:projekt
n5:GA106%2F09%2F1913
n3:rokUplatneniVysledku
n18:2011
n3:svazekPeriodika
42A
n3:tvurceVysledku
Yawny, A. Olbricht, J. Dlouhý, Antonín Pelegrina, J. L.
n3:wos
000292936900006
n3:zamer
n7:AV0Z20410507
s:issn
1073-5623
s:numberOfPages
19
n6:doi
10.1007/s11661-011-0679-y