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dc.contributor.author
Torra, Vicenç
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dc.contributor.author
Martorell, F.
dc.contributor.author
Sun, Q. P.
dc.contributor.author
Ahadi, A.
dc.contributor.author
Lovey, Francisco Carlos
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dc.contributor.author
Sade Lichtmann, Marcos Leonel
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dc.date.available
2019-07-02T20:55:26Z
dc.date.issued
2017-04-01
dc.identifier.citation
Torra, Vicenç; Martorell, F.; Sun, Q. P.; Ahadi, A.; Lovey, Francisco Carlos; et al.; Metastable effects on martensitic transformation in SMAs: Part X. An approach to thermodynamic changes induced for the S-shaped cycles in thick wires of NiTi; Springer; Journal of Thermal Analysis and Calorimetry; 128; 1; 1-4-2017; 259-270
dc.identifier.issn
1388-6150
dc.identifier.uri
http://hdl.handle.net/11336/79042
dc.description.abstract
The transformation and retransformation paths realized at constant stress in wires of NiTi SMAs show a horizontal or “flat” behavior in the hysteretic cycle. After sinusoidal cycling at 0.01 Hz (i.e., training) with a maximal strain of 8 %, the thicker wires of NiTi SMAs, with a diameter of 2.46 mm, have the stress–strain cycles with one S-shaped behavior. A “similar” change appears by varying the grain sizes in the samples, i.e., from 80 to 20 nm. Furthermore, the local measurements of temperature suggest that cycling induces changes in the transformation mechanisms associated with the evolution from horizontal to S shape. For instance, the associated energy evolves from localized transformation to homogeneous heat production in S-shaped cycles. Thermodynamic analysis establishes a link between heat capacity and the slopes of the coexistence curve in f–x or in σ–ε via the (∂ε/∂σ)coex. The flat cycles were coherent with the classical latent heat, i.e., dissipation at constant stress. In the S-shaped cycles, the heat during the phase change seems redistributed as heat capacity against progressive stress. Preliminary direct measurements are coherent with the evolution of the (∂ε/∂σ)coex against strain.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Grain Size
dc.subject
Heat Capacity
dc.subject
Latent Heat
dc.subject
Martensitic Transformation
dc.subject
Niti
dc.subject
S-Shaped Cycles
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Sma
dc.subject
Thinner And Thick Wires
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Metastable effects on martensitic transformation in SMAs: Part X. An approach to thermodynamic changes induced for the S-shaped cycles in thick wires of NiTi
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-06-11T15:21:47Z
dc.journal.volume
128
dc.journal.number
1
dc.journal.pagination
259-270
dc.journal.pais
Alemania
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dc.journal.ciudad
Heidelberg
dc.description.fil
Fil: Torra, Vicenç. Personal Research Group; España
dc.description.fil
Fil: Martorell, F.. Personal Research Group; España
dc.description.fil
Fil: Sun, Q. P.. Hong Kong University of Science and Technology; República de China
dc.description.fil
Fil: Ahadi, A.. Tsukuba University. National Institute For Materials Science; Japón. Wuhan University; China
dc.description.fil
Fil: Lovey, Francisco Carlos. Comision Nacional de Energía Atómica. Gerencia de Área Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Física de Metales; Argentina
dc.description.fil
Fil: Sade Lichtmann, Marcos Leonel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comision Nacional de Energía Atómica. Gerencia de Área Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Física de Metales; Argentina
dc.journal.title
Journal of Thermal Analysis and Calorimetry
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s10973-016-5886-8
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs10973-016-5886-8
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