Study of the stabilization of a Cu-Zn-Al shape memory alloy under stress

Benchiheub, M.; Belkahla, S.; Guénin, G.

doi:10.1051/metal:2000100

Cited by 4 publications

(4 citation statements)

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“…As indicated in figure 9(d), for stresses as high as 100 MPa, a relative stability of SME was observed, but accompanied by an important accumulation of plastic strain under load. These behaviors are similar to those in Cu-25.9Zn-4.0Al (wt%) ribbons by Benchiheub et al [21] and in Ti-Ni based thin wires [6,22].…”

Section: Resultssupporting

confidence: 87%

“…These thermal hysteresis values are relatively small compared with those observed in the literature for Cu-Zn-Al polycrystals. For example, Benchiheub et al [21], studying ribbons obtained through cold rolling from a similar Cu-25.9Zn-4.0Al (wt%) wire of 0.8 mm in diameter, have measured thermal hysteresis between 15 • C and 25 • C for a stress range between 0 and 90 MPa. On the other hand, reduced thermal hysteresis (between 3 and 6 • C) in the stress-free state has been measured by electrical resistivity in Cu-Zn-Al single crystals [4].…”

Section: Resultsmentioning

confidence: 99%

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On two-step strain–temperature behavior in Cu–Zn–Al shape memory alloy wire actuators

Araújo¹,

Gonzalez²

2007

Smart Mater. Struct.

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Nowadays, some compositions of Cu-Zn-Al alloys are commercially available with the potential to present shape memory properties after a suitable thermomechanical treatment. Applied as sensor and/or actuator, the smallest product of Cu-based shape memory alloys (SMA) are wires 0.5 mm in diameter. This paper focuses on Cu-25.3Zn-4.0Al (wt%) wires, 0.5 mm in diameter, that were supplied by Societé Tréfimetaux (France) in a cold drawn condition, without any martensitic transformation. After betatization heat treatment of the SMA wires, physical characterization was carried out through an optical micrograph, DSC and x-ray diffraction while the thermomechanical behavior of the samples was verified by thermal cycling under a constant load. The results obtained have demonstrated the appearance of a two-step transformation which causes an important change in the strain-temperature behavior. This phenomenon is rarely observed in these Cu-Zn-Al SMA.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

On two-step strain–temperature behavior in Cu–Zn–Al shape memory alloy wire actuators

Araújo¹,

Gonzalez²

2007

Smart Mater. Struct.

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“…La déformation de transformation pouvant atteindre 6 %. Ces résultats sont cohérents avec les résultats expérimentaux [10,15]. La Fig.…”

Section: Application Et Résultatsunclassified

Couplage dans les alliages à mémoire de forme

Alhamany¹,

Bensalah²,

Fehri³

2004

Comptes Rendus. Mécanique

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Ce travail s'inscrit dans le cadre d'un modèle permettant d'étudier le comportement micromécanique des alliages à mémoire de forme. L'avantage de ce modèle permet le couplage entre la transformation martensitique et l'évolution microstructurale après fatigue. Ce modèle met en évidence des équations consécutives qui expliquent à la fois les propriétés mécaniques et le changement de structure lors de la transformation. Il fournit des résultats physiques originaux sur le comportement global des alliages à mémoire de forme.

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“…In this study, the acoustic microultrasound technique is used to characterize a so-called shape-memory material. There are several alloy families, the best-known ones are copper-based [1,4], iron-based [2] and Ti-Ni-based [3]. This study is established on the latter.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Shape-Memory Alloy Using Acoustic Techniques and Modelling of the Acoustic Signature $V(z)$

Larbaoui,

Benlachemi,

Boudour

et al. 2024

Metallofiz. Noveishie Tekhnol.

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This work focuses on the characterization of CuZnAl shape-memory alloy in its 3 states (austenitic, mixed, and martensitic) by a non-destructive technique to determine its elastic properties. This technique is based on the principle of acoustic microultrasound. It allows measuring the propagation velocities of the longitudinal, transverse, and Rayleigh acoustic waves, from which the elastic constants of the material (Young's modulus E, shear modulus G) are calculated. Thus, the obtained results of the measurements allow the modelling of the acoustic signature V(z) and the reflection coefficient R(θ) to compare the resulting Rayleigh velocities, which were modelled and measured experimentally in the different phases.

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Study of the stabilization of a Cu-Zn-Al shape memory alloy under stress

Cited by 4 publications

References 0 publications

On two-step strain–temperature behavior in Cu–Zn–Al shape memory alloy wire actuators

On two-step strain–temperature behavior in Cu–Zn–Al shape memory alloy wire actuators

Couplage dans les alliages à mémoire de forme

Characterization of a Shape-Memory Alloy Using Acoustic Techniques and Modelling of the Acoustic Signature $V(z)$

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