Please use this identifier to cite or link to this item:
Title: Scale-invariant avalanche dynamics in the temperature-driven martensitic transition of a Cu-Al-Be single crystal
Author: 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
Keywords: Calorimetria
Model d'Ising
Superfícies (Física)
Transformacions de fase (Física estadística)
Ising model
Surfaces (Physics)
Phase transformations (Statistical physics)
Issue Date: 20-Jun-2019
Publisher: American Physical Society
Abstract: 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
Note: Reproducció del document publicat a:
It is part of: Physical Review B, 2019, vol. 99, num. 22, p. 334101-1-334101-7
Related resource:
ISSN: 1098-0121
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

Files in This Item:
File Description SizeFormat 
697865.pdf1.34 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.