Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 008 |
| Seiten (von - bis) | 1006-1015 |
| Seitenumfang | 10 |
| Fachzeitschrift | Smart materials and structures |
| Jahrgang | 16 |
| Ausgabenummer | 4 |
| Publikationsstatus | Veröffentlicht - 1 Aug. 2007 |
| Extern publiziert | Ja |
Abstract
Crystallographic orientation and cooling rate dependences of the shape memory effect and pseudoelasticity are reported for CoNiAl alloy single crystals oriented along the [001], [110] and [123] directions. Phase transformation response, pseudoelasticity and two-way shape memory effect were investigated through thermo-mechanical experiments. The experimentally determined transformation strains exceeding the theoretical values in the [110] orientation single crystals are attributed to the additional contribution from the detwinning strain. High cooling rates (oil and water quenching) were found to lead to a lower γ-phase volume fraction that resulted in higher shape memory strains under low external stresses. Moreover, the [001] oriented single crystals demonstrated perfect pseudoelasticity (up to 4.3% strain), a large pseudoelastic window (>140 °C), high resistance to dislocation slip and small thermal hysteresis. The existence of detwinning, easy reorientation of favorable variants under low external stresses and significant fully recoverable strains have important implications regarding the magnetic field-induced shape changes in this class of alloys.
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in: Smart materials and structures, Jahrgang 16, Nr. 4, 008, 01.08.2007, S. 1006-1015.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - On the role of the cooling rate and crystallographic orientation on the shape memory properties of CoNiAl single crystals under compression
AU - Canadinc, Demircan
AU - Dadda, Jayaram
AU - Maier, Hans Jürgen
AU - Karaman, Ibrahim
AU - Karaca, Haluk E.
AU - Chumlyakov, Yuriy I.
PY - 2007/8/1
Y1 - 2007/8/1
N2 - Crystallographic orientation and cooling rate dependences of the shape memory effect and pseudoelasticity are reported for CoNiAl alloy single crystals oriented along the [001], [110] and [123] directions. Phase transformation response, pseudoelasticity and two-way shape memory effect were investigated through thermo-mechanical experiments. The experimentally determined transformation strains exceeding the theoretical values in the [110] orientation single crystals are attributed to the additional contribution from the detwinning strain. High cooling rates (oil and water quenching) were found to lead to a lower γ-phase volume fraction that resulted in higher shape memory strains under low external stresses. Moreover, the [001] oriented single crystals demonstrated perfect pseudoelasticity (up to 4.3% strain), a large pseudoelastic window (>140 °C), high resistance to dislocation slip and small thermal hysteresis. The existence of detwinning, easy reorientation of favorable variants under low external stresses and significant fully recoverable strains have important implications regarding the magnetic field-induced shape changes in this class of alloys.
AB - Crystallographic orientation and cooling rate dependences of the shape memory effect and pseudoelasticity are reported for CoNiAl alloy single crystals oriented along the [001], [110] and [123] directions. Phase transformation response, pseudoelasticity and two-way shape memory effect were investigated through thermo-mechanical experiments. The experimentally determined transformation strains exceeding the theoretical values in the [110] orientation single crystals are attributed to the additional contribution from the detwinning strain. High cooling rates (oil and water quenching) were found to lead to a lower γ-phase volume fraction that resulted in higher shape memory strains under low external stresses. Moreover, the [001] oriented single crystals demonstrated perfect pseudoelasticity (up to 4.3% strain), a large pseudoelastic window (>140 °C), high resistance to dislocation slip and small thermal hysteresis. The existence of detwinning, easy reorientation of favorable variants under low external stresses and significant fully recoverable strains have important implications regarding the magnetic field-induced shape changes in this class of alloys.
UR - http://www.scopus.com/inward/record.url?scp=34547432587&partnerID=8YFLogxK
U2 - 10.1088/0964-1726/16/4/008
DO - 10.1088/0964-1726/16/4/008
M3 - Article
AN - SCOPUS:34547432587
VL - 16
SP - 1006
EP - 1015
JO - Smart materials and structures
JF - Smart materials and structures
SN - 0964-1726
IS - 4
M1 - 008
ER -