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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F11%3A00376018%21RIV12-AV0-68081723
rdf:type
skos:Concept n20:Vysledek
dcterms:description
The present study shows how heat treatments affect microstructure and transformation behaviour of superelastic Ni-rich NiTi shape memory wires. Wire samples were sealed into quartz tubes, filled with hydrogen reduction atmosphere, heated for 10 minutes at temperatures increasing in a range from 500 to 600°C and subsequently quenched into cold water. Characteristic transformation temperatures MS, MF, AS, AF, thermal hysteresis and latent heats were investigated using differential scanning calorimetry (DSC). We observed significant changes in DSC charts which recorded B2 R and R B19 phase martensitic transformations. Increasing temperature of the heat treatment resulted in a convergence of the two transformation peaks. R-transformation commenced at systematically lower temperatures and the beginning of the B19 transformation was shifted to higher temperatures with increasing temperature of the heat treatment. In parallel, latent heat of the overall B2 B19 transformation clearly increases. We rationalize these significant changes in the transformation behaviour on the basis of the microstructural development during the heat treatment which is characterized by means of SEM, TEM and EBSD techniques. The present study shows how heat treatments affect microstructure and transformation behaviour of superelastic Ni-rich NiTi shape memory wires. Wire samples were sealed into quartz tubes, filled with hydrogen reduction atmosphere, heated for 10 minutes at temperatures increasing in a range from 500 to 600°C and subsequently quenched into cold water. Characteristic transformation temperatures MS, MF, AS, AF, thermal hysteresis and latent heats were investigated using differential scanning calorimetry (DSC). We observed significant changes in DSC charts which recorded B2 R and R B19 phase martensitic transformations. Increasing temperature of the heat treatment resulted in a convergence of the two transformation peaks. R-transformation commenced at systematically lower temperatures and the beginning of the B19 transformation was shifted to higher temperatures with increasing temperature of the heat treatment. In parallel, latent heat of the overall B2 B19 transformation clearly increases. We rationalize these significant changes in the transformation behaviour on the basis of the microstructural development during the heat treatment which is characterized by means of SEM, TEM and EBSD techniques.
dcterms:title
Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires
skos:prefLabel
Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires Influence of Heat Treatment on Microstructure and Transformation Characteristics of NiTi Shape Memory Wires
skos:notation
RIV/68081723:_____/11:00376018!RIV12-AV0-68081723
n20:predkladatel
n21:ico%3A68081723
n4:aktivita
n11:Z n11:P
n4:aktivity
P(GA106/09/1913), Z(AV0Z20410507)
n4:dodaniDat
n16:2012
n4:domaciTvurceVysledku
n12:8032564 n12:5076633 n12:1123904 n12:6482953 n12:8093326
n4:druhVysledku
n15:D
n4:duvernostUdaju
n22:S
n4:entitaPredkladatele
n5:predkladatel
n4:idSjednocenehoVysledku
204419
n4:idVysledku
RIV/68081723:_____/11:00376018
n4:jazykVysledku
n17:eng
n4:klicovaSlova
Ni-rich NiTi shape memory alloys; Superelastic wires; phase transformation temperatures
n4:klicoveSlovo
n7:phase%20transformation%20temperatures n7:Superelastic%20wires n7:Ni-rich%20NiTi%20shape%20memory%20alloys
n4:kontrolniKodProRIV
[528B77BB339E]
n4:mistoKonaniAkce
Brno
n4:mistoVydani
Ostrava
n4:nazevZdroje
METAL 2011 Conference Proceedings
n4:obor
n9:JG
n4:pocetDomacichTvurcuVysledku
5
n4:pocetTvurcuVysledku
5
n4:projekt
n18:GA106%2F09%2F1913
n4:rokUplatneniVysledku
n16:2011
n4:tvurceVysledku
Kuběnová, Monika Dlouhý, Antonín Svoboda, Milan Čermák, Jiří Zálešák, Jakub
n4:typAkce
n19:WRD
n4:zahajeniAkce
2011-05-18+02:00
n4:zamer
n14:AV0Z20410507
s:numberOfPages
7
n13:hasPublisher
TANGER, spol. s r.o.
n8:isbn
978-80-87294-22-2