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Statements

Subject Item
n2:RIV%2F61989100%3A27360%2F11%3A86080876%21RIV12-GA0-27360___
rdf:type
skos:Concept n15:Vysledek
dcterms:description
Transformation temperatures of binary alloys from Ti-Ni system are highly sensitive to chemical composition of the alloy. This sensitivity, however, causes rather considerable complications already during process of preparation. Transformation temperatures of bays rich in Ni can be successfully modified. The key to modification of transformation temperatures lies in use of precipitation reaction of quenched over-saturated solution for influencing of composition of TiNi matrix and thus to precise control of transformation temperatures. Principle of this method consists in metastable balance between inter-metallic phase TiNi and coherent precipitates Ti3Ni4. Although the precipitate Ti3Ni4 is considered to be metastable in comparison with TiNi3, it is highly stable at temperatures below 600°C. During precipitation reaction Ti3Ni4 is formed and this phenomenon is connected with decrease of Ni content in TiNi matrix, which leads to increased temperatures of phase transformations TR (temperature of formation of R-phase) and Ms (temperature “martensite start”). It is important that transformation temperature after long-term ageing is independent on chemical composition of the alloy, and it depends only on temperature of ageing as a consequence of equilibrium between these phases. This phenomenon should not occur at ageing at higher temperatures, formation of precipitate Ti3Ni4 should occur only during cooling of the sample from the temperature of ageing. The alloy Ni50.6-Ti (at. %), prepared in high-frequency induction vacuum furnace, was chosen as experimental material. Samples of the alloy were sealed into evacuated quartz glass tube and aged at constant temperature with various durations of dwell. Afterwards transformation characteristics of the samples were determined by DSC method. Transformation temperatures of binary alloys from Ti-Ni system are highly sensitive to chemical composition of the alloy. This sensitivity, however, causes rather considerable complications already during process of preparation. Transformation temperatures of bays rich in Ni can be successfully modified. The key to modification of transformation temperatures lies in use of precipitation reaction of quenched over-saturated solution for influencing of composition of TiNi matrix and thus to precise control of transformation temperatures. Principle of this method consists in metastable balance between inter-metallic phase TiNi and coherent precipitates Ti3Ni4. Although the precipitate Ti3Ni4 is considered to be metastable in comparison with TiNi3, it is highly stable at temperatures below 600°C. During precipitation reaction Ti3Ni4 is formed and this phenomenon is connected with decrease of Ni content in TiNi matrix, which leads to increased temperatures of phase transformations TR (temperature of formation of R-phase) and Ms (temperature “martensite start”). It is important that transformation temperature after long-term ageing is independent on chemical composition of the alloy, and it depends only on temperature of ageing as a consequence of equilibrium between these phases. This phenomenon should not occur at ageing at higher temperatures, formation of precipitate Ti3Ni4 should occur only during cooling of the sample from the temperature of ageing. The alloy Ni50.6-Ti (at. %), prepared in high-frequency induction vacuum furnace, was chosen as experimental material. Samples of the alloy were sealed into evacuated quartz glass tube and aged at constant temperature with various durations of dwell. Afterwards transformation characteristics of the samples were determined by DSC method.
dcterms:title
DSC analysis of Binary Ti-Ni alloy after long-time ageing DSC analysis of Binary Ti-Ni alloy after long-time ageing
skos:prefLabel
DSC analysis of Binary Ti-Ni alloy after long-time ageing DSC analysis of Binary Ti-Ni alloy after long-time ageing
skos:notation
RIV/61989100:27360/11:86080876!RIV12-GA0-27360___
n15:predkladatel
n16:orjk%3A27360
n3:aktivita
n11:Z n11:P
n3:aktivity
P(GA106/09/1573), Z(MSM6198910013)
n3:cisloPeriodika
6
n3:dodaniDat
n8:2012
n3:domaciTvurceVysledku
n7:2890194 n7:6608787
n3:druhVysledku
n18:J
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
195534
n3:idVysledku
RIV/61989100:27360/11:86080876
n3:jazykVysledku
n5:eng
n3:klicovaSlova
martensitic transformation; DSC; Shape memory
n3:klicoveSlovo
n9:martensitic%20transformation n9:Shape%20memory n9:DSC
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[6199382064A7]
n3:nazevZdroje
Hutnické listy
n3:obor
n20:JG
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
3
n3:projekt
n12:GA106%2F09%2F1573
n3:rokUplatneniVysledku
n8:2011
n3:svazekPeriodika
64
n3:tvurceVysledku
Kursa, Miroslav Dlouhý, Antonín Szurman, Ivo
n3:zamer
n17:MSM6198910013
s:issn
0018-8069
s:numberOfPages
4
n19:organizacniJednotka
27360