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Avalanche criticality in the martensitic transition of Cu67.64Zn16.71Al15.65 shape-memory alloy: a calorimetric and acoustic emission study
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Gallardo, María Carmen, Manchado, Julia, Romero, Francisco Javier, Cerro, Jamie del, Salje, Ekhard K. H., Planes, Antoni, Vives, Eduard, Romero, Ricardo and Stipcich, Marcelo (2010) Avalanche criticality in the martensitic transition of Cu67.64Zn16.71Al15.65 shape-memory alloy: a calorimetric and acoustic emission study. Physical Review B (Condensed Matter and Materials Physics), Vol.81 (No.17). Article 4102. doi:10.1103/PhysRevB.81.174102
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Official URL: http://dx.doi.org/10.1103/PhysRevB.81.174102
Abstract
The first-order diffusionless structural transition in Cu67.64Zn16.71Al15.65 is characterized by jerky propagation of phase fronts related to the appearance of avalanches. In this paper, we describe a full analysis of this avalanche behavior using calorimetric heat-flux measurements and acoustic emission measurements. Two different propagation modes, namely, smooth front propagation and jerky avalanches, were observed in extremely slow measurements with heating and cooling rates as low as a few 10−3 K/h. Avalanches show criticality where each avalanche leads to a spike in the heat flux. Their statistical analysis leads to a power law [P(E)∼E−ε, where P(E)dE is the probability to observe an avalanche with energy E in an interval between E and E+dE] with an energy exponent of ε=2.15±0.15 in excellent agreement with the results of acoustic emission measurements. Avalanches appear to be more common for heating rates faster than 5×10−3 K/h whereas smooth front propagation occurs in all calorimetric measurements and (almost) exclusively for slower heating rates. Repeated cooling runs were taken after a waiting time of 1 month (and an intermediate heating run). Correlations between the avalanche sequences of the two cooling runs were found for the strongest avalanche peaks but not for the full sequence of avalanches. The memory effect is hence limited to strong avalanches.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Martensitic transformations, Crystals -- Effect of temperature on, Avalanches -- Mathematical models | ||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 3 May 2010 | ||||
| Dates: |
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| Volume: | Vol.81 | ||||
| Number: | No.17 | ||||
| Page Range: | Article 4102 | ||||
| DOI: | 10.1103/PhysRevB.81.174102 | ||||
| Status: | Peer Reviewed | ||||
| Access rights to Published version: | Open Access | ||||
| Funder: | Spain. Dirección General de Investigación Científica y Técnica (DGICYT), Fundación Cámara (FC), Consejo Nacional de Ciencia y Técnica (Argentina) (CONACYT) | ||||
| Grant number: | FIS2006-04045 (DGICYT), MAT 2007-61200 (CONACYT) |
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