Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 4789-4796 |
| Seitenumfang | 8 |
| Fachzeitschrift | Materials Today: Proceedings |
| Jahrgang | 4 |
| Ausgabenummer | 3 |
| Publikationsstatus | Veröffentlicht - 20 Juni 2017 |
Abstract
In the present study, the necessary conditions for the two-way shape memory effect (TWSME) and its stress-free thermal cycling stability in the Co35Ni35Al30 single crystals, oriented along the [001]B2 direction, were investigated. The TWSME is attributed to the internal stress fields created through the generation of stable dislocation structures and retained martensite in two ways. First, the training involved 100 loading/unloading cycles at room temperature T=295 K with the maximum given strain of 6.0% in compression. Second, the ageing at T=423 K for 1.0 h under a stress of 500 MPa was applied to the martensitic state along the [001]B2||[110]L10 direction. It was experimentally shown that the aged crystals demonstrated the best properties of the TWSME response when compared with the trained crystals: i.e., a higher operating temperature range (250-297 K), the high cyclic stability of the reversible strain ϵTWSME=(3.1±0.3)% during thermal cycles and the low value of the temperature hysteresis (ΔT=24 K). In contrast, in the trained crystals the operating temperature range of the TWSME is shifted towards a low temperature region (220-275 K), after 100 thermal cycles the reversible strain ϵTWSME is significant decreased from 3.0 to 2.0 % and the temperature hysteresis ΔT is increased from 33 to 50 K.
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- Allgemeine Materialwissenschaften
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in: Materials Today: Proceedings, Jahrgang 4, Nr. 3, 20.06.2017, S. 4789-4796.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Two-way shape memory effect in [001]B2-oriented Co-Ni-Al single crystals
AU - Eftifeeva, Anna
AU - Panchenko, Elena
AU - Chumlyakov, Yuriy
AU - Maier, Hans Jürgen
N1 - Funding information: The reported study was supported by RFBR (Grant No 16-08-00179) and The Tomsk State University Academic D.I. Mendeleev Fund Program.
PY - 2017/6/20
Y1 - 2017/6/20
N2 - In the present study, the necessary conditions for the two-way shape memory effect (TWSME) and its stress-free thermal cycling stability in the Co35Ni35Al30 single crystals, oriented along the [001]B2 direction, were investigated. The TWSME is attributed to the internal stress fields created through the generation of stable dislocation structures and retained martensite in two ways. First, the training involved 100 loading/unloading cycles at room temperature T=295 K with the maximum given strain of 6.0% in compression. Second, the ageing at T=423 K for 1.0 h under a stress of 500 MPa was applied to the martensitic state along the [001]B2||[110]L10 direction. It was experimentally shown that the aged crystals demonstrated the best properties of the TWSME response when compared with the trained crystals: i.e., a higher operating temperature range (250-297 K), the high cyclic stability of the reversible strain ϵTWSME=(3.1±0.3)% during thermal cycles and the low value of the temperature hysteresis (ΔT=24 K). In contrast, in the trained crystals the operating temperature range of the TWSME is shifted towards a low temperature region (220-275 K), after 100 thermal cycles the reversible strain ϵTWSME is significant decreased from 3.0 to 2.0 % and the temperature hysteresis ΔT is increased from 33 to 50 K.
AB - In the present study, the necessary conditions for the two-way shape memory effect (TWSME) and its stress-free thermal cycling stability in the Co35Ni35Al30 single crystals, oriented along the [001]B2 direction, were investigated. The TWSME is attributed to the internal stress fields created through the generation of stable dislocation structures and retained martensite in two ways. First, the training involved 100 loading/unloading cycles at room temperature T=295 K with the maximum given strain of 6.0% in compression. Second, the ageing at T=423 K for 1.0 h under a stress of 500 MPa was applied to the martensitic state along the [001]B2||[110]L10 direction. It was experimentally shown that the aged crystals demonstrated the best properties of the TWSME response when compared with the trained crystals: i.e., a higher operating temperature range (250-297 K), the high cyclic stability of the reversible strain ϵTWSME=(3.1±0.3)% during thermal cycles and the low value of the temperature hysteresis (ΔT=24 K). In contrast, in the trained crystals the operating temperature range of the TWSME is shifted towards a low temperature region (220-275 K), after 100 thermal cycles the reversible strain ϵTWSME is significant decreased from 3.0 to 2.0 % and the temperature hysteresis ΔT is increased from 33 to 50 K.
KW - ageing
KW - Martensitic transformation
KW - Single crystals
KW - Training
KW - Two-way Shape memory effect
UR - http://www.scopus.com/inward/record.url?scp=85020866504&partnerID=8YFLogxK
U2 - 10.1016/j.matpr.2017.04.072
DO - 10.1016/j.matpr.2017.04.072
M3 - Article
AN - SCOPUS:85020866504
VL - 4
SP - 4789
EP - 4796
JO - Materials Today: Proceedings
JF - Materials Today: Proceedings
SN - 2214-7853
IS - 3
ER -