Dynamic heat flux experiments in Cu67.64Zn16.71Al15.65: Separating the time scales of fast and ultra-slow kinetic processes in martensitic transformations

Romero, F. J and Manchado, J. and Martín-Olalla, J. M and Gallardo, M. C and Salje, E. K. H. (2011) Dynamic heat flux experiments in Cu67.64Zn16.71Al15.65: Separating the time scales of fast and ultra-slow kinetic processes in martensitic transformations. Applied Physics Letters, 99 (1). 011906-011906. DOI https://doi.org/10.1063/1.3609239

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Abstract

Crackling noise and avalanches during the martensite phase transformation of Cu67.64Zn16.71Al15.65 were investigated. Heat flux measurements with extremely slow heating rates of 0.005 Kh−1 allowed sufficient separation between the continuous background and the avalanche jerks. The jerk enthalpy is below 3% of the total transformation enthalpy. The crackling noise follows power law behavior with an energy exponent near ɛ = 1.8. The jerks are almost uncorrelated with approximately a Poisson distribution of the waiting times between jerks. Quantitative analysis showed a scaling behavior with p(wt) ∼ wt(γ−1)exp(−wt/τ)n with γ = 0.7 and n ≈ 1.

Item Type:	Article
Uncontrolled Keywords:	2011AREP; IA62;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Applied Physics Letters
Volume:	99
Page Range:	011906-011906
Identification Number:	https://doi.org/10.1063/1.3609239
Depositing User:	Sarah Humbert
Date Deposited:	08 Feb 2012 10:33
Last Modified:	23 Jul 2013 10:03
URI:	http://eprints.esc.cam.ac.uk/id/eprint/2371

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