Metastable effects on martensitic transformation in SMA

Auguet, C.; Isalgué, A.; Lovey, F.C.; Pelegrina, J.L.; Ruiz, S.; Torra, Vicenç

doi:10.1007/s10973-006-7625-z

Cited by 24 publications

(9 citation statements)

References 15 publications

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“…3). The time dependence of Rs [15,16] suggests a time constant of more than 2 months at 373 K (for CuAlBe it was less than 2 days at this temperature, and for CuZnAl it was near 2 hours).…”

Section: Niti Alloymentioning

confidence: 94%

Low temperature aging behaviour of transformation temperatures in some Cu-based and NiTi SMA

Isalgué¹,

Torra²,

Lovey

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

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Abstract. Effects of aging at intermediate temperatures (near 4 precipitation, which affects the transformation behaviour. In this work, we observe some dependences (recoverable or not) of transformation temperature with aging at temperatures near or under in beta phase. Two copper-based SMA alloys have been analyzed, CuZnAl and CuAlBe. Also, some analysis has been done on pseudo-elastic NiTi. By aging at temperatures near the two copper alloys show changes in transformation temperatures, which can be related univocally to the changes in the temperature at which the alloy is kept. In both alloys, by staying long time at a given temperature, an asymptotic value of the transformation temperature is reached, and further coming to the same temperature produces the transformation temperature to evolve to that asymptotic value. The maximal amplitude of the changes is about 16% of the amplitude of the change in aging temperature. The changes are much faster in CuZnAl than in CuAlBe, and the sign of the changes is opposite in CuAlBe respect to that in CuZnAl. The process can be well modelled by a system of differential equations with one or two terms, giving a "tracking" of the transformation temperature respect the temperature at which the alloy is kept. The activation energies for the time evolution suggest atomic-order related processes as cause for the transformation temperature changes. For NiTi, the evolution is much slower, and seems to be monotonic with time, suggesting a precipitation-related mechanism as the origin of the transformation temperature changes, even at temperatures near From the data, some conclusions may be drawn concerning long-time effects on the applications of the alloys

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“…3). The time dependence of Rs [15,16] suggests a time constant of more than 2 months at 373 K (for CuAlBe it was less than 2 days at this temperature, and for CuZnAl it was near 2 hours).…”

Section: Niti Alloymentioning

confidence: 94%

Low temperature aging behaviour of transformation temperatures in some Cu-based and NiTi SMA

Isalgué¹,

Torra²,

Lovey

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

Self Cite

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show abstract

“…Nickel-titanium alloys (NiTi) with near-equiatomic composition, subjected to cold working and annealing treatments, is commonly considered the most suitable SMA for control devices, given its better superelastic properties, higher stability under temperature variations and higher resistance to corrosion and fatigue [5,8,16,17].…”

Section: Shape Memory Alloysmentioning

confidence: 99%

Semi-active Damping Device Based on Superelastic Shape Memory Alloys

2015

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“…Until this limitation is fully solved by appropriate improvements, the NiTi in pseudoelastic state (with recentering capabilities) does not seem to be a satisfactory alloy for earthquake damping applications in Civil Engineering. Other diffusion effects are described in [15].…”

Section: Niti Remarkmentioning

confidence: 99%

“…Also, an evaluation of the long time diffusive contributions related to atomic order evolution is required [4,[12][13][14][15]. For instance, the devices need to be guaranteed after several decades under the action of summer-winter temperature effects.…”

Section: Introductionmentioning

confidence: 99%