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2019-06-20

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/155451

Scale-invariant avalanche dynamics in the temperature-driven martensitic transition of a Cu-Al-Be single crystal

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https://doi.org/10.1103/PhysRevB.99.224101

Resum

We have combined high sensitivity, extra-low differential temperature scanning rate calorimetry, and acoustic emission (AE) measurements to study avalanches during the cubic ↔ 18R martensitic transition of a Cu-Al-Be single crystalline shape memory alloy. Both AE and calorimetry corroborate a good power-law behavior for cooling with an exponent É≃1.6. For heating, a slope is observed in the maximum likelihood curves, which confirms that our data are affected by an exponential cutoff. An effective energy exponent, É∼1.85, and a cutoff, λ-1=0.115(38)×10-3aJ, were determined by fits of power-laws with exponential damping. The long tail observed in the lowerature region by calorimetric measurements suggests the existence of significant elastic effects that constrain the progress of the transformation at low temperatures. While thermodynamic features such as transformation enthalpy and entropy are those expected for Cu-based shape-memory alloys undergoing a cubic ↔ 18R transition, the critical behavior deviates from the corresponding behavior expected from this symmetry change. These deviations are a consequence of the elastic hardening induced by the interplay of the transformation with dislocation jamming, which has the effect of effectively reducing the number of pathways connecting the parent and martensitic phase

Matèries

Calorimetria, Ultrasons, Model d'Ising, Superfícies (Física), Transformacions de fase (Física estadística)

Matèries (anglès)

Calorimetry, Ultrasonics, Ising model, Surfaces (Physics), Phase transformations (Statistical physics)

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Articles publicats en revistes (Física de la Matèria Condensada)

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ROMERO, Francisco javier, MARTÍN-OLALLA, José-maría, GALLARDO, María carmen., SOTO-PARRA, Daniel e., SALJE, Ekhard k. h., VIVES I SANTA-EULÀLIA, Eduard, PLANES VILA, Antoni. Scale-invariant avalanche dynamics in the temperature-driven martensitic transition of a Cu-Al-Be single crystal. _Physical Review B_. 2019. Vol. 99, núm. 22, pàgs. 334101-1-334101-7. [consulta: 30 de desembre de 2025]. ISSN: 1098-0121. [Disponible a: https://hdl.handle.net/2445/155451]

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