Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | SMST-2007 - Proceedings of the International Conference on Shape Memory and Superelastic Technologies |
| Seiten | 659-666 |
| Seitenumfang | 8 |
| Publikationsstatus | Veröffentlicht - 2008 |
| Extern publiziert | Ja |
| Veranstaltung | International Conference on Shape Memory and Superelastic Technologies, SMST-2007 - Tsukuba, Japan Dauer: 2 Dez. 2007 → 5 Dez. 2007 |
Publikationsreihe
| Name | SMST-2007 - Proceedings of the International Conference on Shape Memory and Superelastic Technologies |
|---|
Abstract
Pseudoelasticity as a function of temperature and crystallographic orientation in Co49Ni21Ga30 single crystals was studied under compression. The pseudoelastic (PE) temperature window and its dependency on the Clausius-Clapeyron (CC) slope and the resolved shear stress factor (RSSF) for the phase transformation were revealed for as-grown 〈100〉, 〈123〉 and 〈235〉 orientations. A high RSSF value results in a low CC-slope, which in turn brought about a large PE window of 400°C for the 〈100〉 orientation. Thus, the effect of homogenization on crystals with this orientation was also investigated. Homogenization restored the single phase B2 austenite (β) from the dual phase (β + γ) as-grown crystals changing the chemical composition of the β-matrix, which lead to increase in the CC-slope. This in turn depressed the PE temperature window to 350°C. The results suggested that the pseudoelasticity of CoNiGa alloys can be tailored for specific elevated temperature applications by the selection of crystallographic orientation and heat treatment.
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Werkstoffmechanik
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SMST-2007 - Proceedings of the International Conference on Shape Memory and Superelastic Technologies. 2008. S. 659-666 (SMST-2007 - Proceedings of the International Conference on Shape Memory and Superelastic Technologies).
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Aufsatz in Konferenzband › Forschung › Peer-Review
}
TY - GEN
T1 - High-temperature pseudoelasticity of Co49Ni21Ga 30 shape memory alloy single crystals under compression
AU - Dadda, J.
AU - Maier, H. J.
AU - Karaman, I.
PY - 2008
Y1 - 2008
N2 - Pseudoelasticity as a function of temperature and crystallographic orientation in Co49Ni21Ga30 single crystals was studied under compression. The pseudoelastic (PE) temperature window and its dependency on the Clausius-Clapeyron (CC) slope and the resolved shear stress factor (RSSF) for the phase transformation were revealed for as-grown 〈100〉, 〈123〉 and 〈235〉 orientations. A high RSSF value results in a low CC-slope, which in turn brought about a large PE window of 400°C for the 〈100〉 orientation. Thus, the effect of homogenization on crystals with this orientation was also investigated. Homogenization restored the single phase B2 austenite (β) from the dual phase (β + γ) as-grown crystals changing the chemical composition of the β-matrix, which lead to increase in the CC-slope. This in turn depressed the PE temperature window to 350°C. The results suggested that the pseudoelasticity of CoNiGa alloys can be tailored for specific elevated temperature applications by the selection of crystallographic orientation and heat treatment.
AB - Pseudoelasticity as a function of temperature and crystallographic orientation in Co49Ni21Ga30 single crystals was studied under compression. The pseudoelastic (PE) temperature window and its dependency on the Clausius-Clapeyron (CC) slope and the resolved shear stress factor (RSSF) for the phase transformation were revealed for as-grown 〈100〉, 〈123〉 and 〈235〉 orientations. A high RSSF value results in a low CC-slope, which in turn brought about a large PE window of 400°C for the 〈100〉 orientation. Thus, the effect of homogenization on crystals with this orientation was also investigated. Homogenization restored the single phase B2 austenite (β) from the dual phase (β + γ) as-grown crystals changing the chemical composition of the β-matrix, which lead to increase in the CC-slope. This in turn depressed the PE temperature window to 350°C. The results suggested that the pseudoelasticity of CoNiGa alloys can be tailored for specific elevated temperature applications by the selection of crystallographic orientation and heat treatment.
UR - http://www.scopus.com/inward/record.url?scp=65649119339&partnerID=8YFLogxK
U2 - 10.1361/cp2007smst659
DO - 10.1361/cp2007smst659
M3 - Conference contribution
AN - SCOPUS:65649119339
SN - 9780871707222
T3 - SMST-2007 - Proceedings of the International Conference on Shape Memory and Superelastic Technologies
SP - 659
EP - 666
BT - SMST-2007 - Proceedings of the International Conference on Shape Memory and Superelastic Technologies
T2 - International Conference on Shape Memory and Superelastic Technologies, SMST-2007
Y2 - 2 December 2007 through 5 December 2007
ER -