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Dynamic heat flux experiments in Cu67.64Zn 16.71Al15.65: Separating the time scales of fast and ultra-slow kinetic processes in martensitic transformations

AuthorsRomero, F.J.; Manchado, J.; Martn-Olalla, J.M.; Gallardo, M.C.; Salje, E.K.H.
Issue Date2011
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 99 (2011)
AbstractCrackling 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 ε=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. © 2011 American Institute of Physics.
Identifiersdoi: 10.1063/1.3609239
issn: 0003-6951
Appears in Collections:(ICMS) Artículos
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