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Statements

Subject Item
n2:RIV%2F68081723%3A_____%2F08%3A00324692%21RIV09-AV0-68081723
rdf:type
n15:Vysledek skos:Concept
dcterms:description
Investigations of multi-step martensitic transformations in Ni-rich NiTi single crystals and polycrystals are reported. Attention is mainly given to processes that involve a two-step RB19 transition. Single crystals and polycrystals with a Ni content close to 51 at.% were subjected to standard heat-treatments during which microstructures with a homogeneous distribution of Ni4Ti3 precipitates form. Results obtained using differential scanning calorimetry and conventional and in-situ transmission electron microscopy clearly show that these microstructures transform from R phase into B19 martensite in two steps. We suggest that the nucleation conditions for the B19 phase must be taken into account to rationalize the obtained results. Investigations of multi-step martensitic transformations in Ni-rich NiTi single crystals and polycrystals are reported. Attention is mainly given to processes that involve a two-step RB19 transition. Single crystals and polycrystals with a Ni content close to 51 at.% were subjected to standard heat-treatments during which microstructures with a homogeneous distribution of Ni4Ti3 precipitates form. Results obtained using differential scanning calorimetry and conventional and in-situ transmission electron microscopy clearly show that these microstructures transform from R phase into B19 martensite in two steps. We suggest that the nucleation conditions for the B19 phase must be taken into account to rationalize the obtained results. Je prezentována analýza vícekrokových martenzitických transformací v Ni-bohatých slitinách NiTi s tvarovou pamětí. Pozornost je zaměřena zejména na procesy, které vedou k dvoukrokové transformaci mezi fázemi R a B19’. Monokrystaly a polykrystaly s obsahem Ni blízkým 51at% byly podrobeny standardnímu tepelnému zpracování, které vedlo k homogenní precipitaci fáze Ni4Ti3. Výsledky dosažené metodami diferenciální skenovací kalorimetrie a konvenční a in-situ elektronové mikroskopie prokázaly, že tyto mikrostruktury transformují mezi fázemi R a B19’ ve dvou krocích. Vysvětlení vícekrokové dráhy martenzitické transformaci v těchto případech vyžaduje rozbor podmínek nukleace fáze B19’ na hranicích zrn fáze R.
dcterms:title
Conventional and in-situ transmission electron microscopy investigations into multistage martensitic transformations in Ni-rich NiTi shape memory alloys Conventional and in-situ transmission electron microscopy investigations into multistage martensitic transformations in Ni-rich NiTi shape memory alloys Konvenční a in-situ transmisní elektronová mikroskopie Ni-bohatých slitin NiTi s tvarovou pamětí vykazujících vícekrokovou dráhu martenzitické transformace
skos:prefLabel
Conventional and in-situ transmission electron microscopy investigations into multistage martensitic transformations in Ni-rich NiTi shape memory alloys Konvenční a in-situ transmisní elektronová mikroskopie Ni-bohatých slitin NiTi s tvarovou pamětí vykazujících vícekrokovou dráhu martenzitické transformace Conventional and in-situ transmission electron microscopy investigations into multistage martensitic transformations in Ni-rich NiTi shape memory alloys
skos:notation
RIV/68081723:_____/08:00324692!RIV09-AV0-68081723
n3:aktivita
n6:Z n6:P
n3:aktivity
P(GA106/05/0918), Z(AV0Z20410507)
n3:cisloPeriodika
Sp.Iss.
n3:dodaniDat
n7:2009
n3:domaciTvurceVysledku
n13:9922660 n13:5076633
n3:druhVysledku
n12:J
n3:duvernostUdaju
n4:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
361288
n3:idVysledku
RIV/68081723:_____/08:00324692
n3:jazykVysledku
n14:eng
n3:klicovaSlova
NiTi shape memory alloys; Ni4Ti3 precipitates; Multi-step martensitic transformations
n3:klicoveSlovo
n10:Ni4Ti3%20precipitates n10:Multi-step%20martensitic%20transformations n10:NiTi%20shape%20memory%20alloys
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[266608E21A71]
n3:nazevZdroje
Materials Science and Engineering A-Structural materials
n3:obor
n18:BM
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
4
n3:projekt
n9:GA106%2F05%2F0918
n3:rokUplatneniVysledku
n7:2008
n3:svazekPeriodika
481
n3:tvurceVysledku
Dlouhý, Antonín Bojda, Ondřej Somsen, Ch. Eggeler, G.
n3:wos
000255716100085
n3:zamer
n16:AV0Z20410507
s:issn
0921-5093
s:numberOfPages
5