Guaranteed behaviour of shape memory alloys : After quench and long time effects in CuZnAl SMA

Isalgué, A.; Torra, V.

doi:10.1051/jp4:2001825

Cited by 3 publications

(1 citation statement)

References 9 publications

(21 reference statements)

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“…08 mm) is welded on the sample permitting a direct evaluation of the thermal effects. Transformation temperatures as a function of time and temperature at which the samples were kept have been obtained by means of electrical resistance measurements using a high resolution computerized system [9,10]. For resistance measurements diluted nitric acid was used for sample polishing.…”

Section: Methodsmentioning

confidence: 99%

Shape memory alloys: From the physical properties of metastable phase transitions to dampers for civil engineering applications

Torra¹,

Isalgué²,

Lovey

et al. 2004

J. Phys. IV France

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Abstract. The physical properties of Shape Memory Alloys (SMA), useful in damping effects of scarce events as quakes, are studied for Cu-based alloys (CuAlBe) and partially for NiTi in the appropriate time scale. The evaluation ofthe deibrmation (s) in the hysteresis cycle and in their internai loops, against the thermodynamic forces, i. e. the external stress (o) and température (T) is performed. The main goal for the applicability of the alloys centers in reliable behavior after several years of inactivity. The alloy require a minimal transformation temperature change and, also, within a reduced transient time to ensure that the material always remain inside the thermoelastic window (full parent phase recovery at zero stress and without permanent deformation at maximal stress). The macroscopic behavior associated with the Clausius-Clapeyron equation, the material fatigue and the local temperature changes, produced by latent heat and by frictional contributions, are critically visualized. The microscopic phenomena related with the transient after quenched effect, the evolution in the region of phase coexistence and the long time seasonal actions in parent phase are, also, evaluated.

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Section: Methodsmentioning

confidence: 99%