Thermal and acoustic noises generated by austenite/martensite transformation in NiFeGaCo single crystals

Bolgár, M.K.; Tóth, László Zoltán; Szabó, S.; Gyöngyösi, Sz.; Daróczi, Lajos; Panchenko, E. Yu.; Chumlyakov, Y.I.; Beke, Dezső L.

doi:10.1016/j.jallcom.2015.10.173

Cited by 20 publications

(28 citation statements)

References 27 publications

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“…[17] and [18] for AE during thermally induced transformations and to the results of Ref. [27] obtained during strain field induced cubic/monoclinic transition in strain intermittency of CuAlBe single crystals.…”

Section: B Critical Exponentsmentioning

confidence: 73%

“…[7,9,[16][17][18] such type of investigations during martensitic transformations there are only two recent publications in Ni 2 MnGa alloys available in the literature [7,9], with partly contradictory results. Using differential scanning calorimetry (DSC), polarization interferometer optics (interference-contrast colloid technique), and detection of magnetic domain dynamics by the application of a pickup coil (like in the traditional Barkhausen techniques), it was obtained in Ni 54 · 35 Mn 23 · 18 Ga 22 · 47 and Fe 70 Pd 30 single crystals [7] that micromagnetic reconfigurations are enslaved to the structural transformation.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous investigation of thermal, acoustic, and magnetic emission during martensitic transformation in single-crystallineNi2MnGa

et al. 2016

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Simultaneous thermal, acoustic, and magnetic emission (AE and ME) measurements during thermally induced martensitic transformation in Ni 2 MnGa single crystals demonstrate that all three types of the above noises display many coincident peaks and the same start and finish temperatures. The amplitude and energy distribution functions for AE and ME avalanches satisfy power-law behavior, corresponding to the symmetry of the martensite. At zero external magnetic field asymmetry in the exponents was obtained: their value was larger for heating than for cooling. Application of constant, external magnetic fields (up to B = 722 mT) leads to the disappearance of the above asymmetry, due to the decrease of the multiplicity of the martensite variants. Time correlations (i.e., the existence of nonhomogeneous temporal processes) within AE as well as ME emission events are demonstrated by deviations from the uncorrelated behavior on probability distributions of waiting times as well as of a sequence of number of events. It is shown that the above functions collapse on universal master curves for cooling and heating as well as for AE and ME noises. The analysis of the existence of temporal correlations between AE and ME events revealed that at short times the acoustic signals show a time delay relative to the magnetic one, due to the time necessary for the propagation of the ultrasound. At intermediate times, as expected, the magnetic signal is delayed, i.e., the magnetic domain rearrangement followed the steps of structural transformation. At much longer times the deviation from an uncorrelated (Poisson-type) behavior is attributed to the nonhomogeneity of the avalanche statistics.

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Section: B Critical Exponentsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Simultaneous investigation of thermal, acoustic, and magnetic emission during martensitic transformation in single-crystallineNi2MnGa

et al. 2016

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“…The calorimetric measurements and their evaluations were carried out, similar to the usual procedure described in Refs. [24][25][26][27]. The mass of the quenched and austenite-stabilized samples was 385 mg, while it was 18 mg for the SIM-aged sample.…”

Section: Methodsmentioning

confidence: 99%

“…The calibration was made with the melting point of ice as well as pure indium. The time constant of the device was found to be 6 s. This value was taken into account in the calculation of the contributions of the decay of the overlapping peaks in the DSC curves [24].…”

Section: Methodsmentioning

confidence: 99%

Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni51Fe18Ga27Co4 Single Crystal

Samy

Daróczi

Tóth

et al. 2020

Metals

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Simultaneous differential scanning calorimetry, DSC, and acoustic emission, AE, measurements were carried out for single crystals of quenched and stress-induced martensite stabilized (SIM-aged) shape memory Ni51Fe18Ga27Co4 alloy. The transformation temperatures were shifted to higher values, the forward (from austenite to martensite) and reverse transitions became sharper and the width of the hysteresis increased in the SIM-aged sample. The energy distributions of acoustic hits showed similar behaviour to those of the quenched sample and the energy exponents, characterizing the power law behaviour, were also similar. For SIM-aged alloys at heating, in accordance with the sharper (burst-like) transition observed in the DSC run, few high-energy solitary hits were observed, and these hits did not fit to the energy distribution function fitted for smaller energies. Thus, these high-energy events were attributed to high sudden jumps in the phase transition during heating. The effect of long-range order (by applying a heat treatment at 573 K for 6 h to transform the B2 austenite to ordered L21 structure) and the SIM-aging on the transformation entropy was also investigated by DSC. It was found that the entropy was about 36% smaller after SIM-aging of the quenched sample and it was practically unchanged after austenite stabilization.

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“…Baró et al (2013) reported a very complete parallel between the acoustic emissions produced by a porous material under uniaxial compression and earthquakes. The same experimental techniques are widely used for the investigation of device materials such as ferroelectric, ferromagnets, and ferroelastics (Bolgár et al 2016;Dul'kin et al 2015;Guyot et al 1988;Hoffmann et al 2001;Salje et al , 2015Skal's'kyi et al 2009;Vives et al 1994) with a significant increase of published data over recent years on the acoustic emission during force-induced changes of microstructures.…”

Section: Introductionmentioning

confidence: 99%

Collapsing minerals: Crackling noise of sandstone and coal, and the predictability of mining accidents

Jiang

Chen

et al. 2016

American Mineralogist

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Mining accidents are sometimes preceded by high levels of crackling noise, which follow universal rules for the collapse of minerals. The archetypal test cases are sandstone and coal. Their collapse mechanism is almost identical to earthquakes: the crackling noise in large, porous samples follows a power law (Gutenberg-Richter) distribution P ~ E -e with energy exponents e for near critical stresses of e = 1.55 for dry and wet sandstone, and e = 1.32 for coal. The exponents of early stages are slightly increased, 1.7 (sandstone) and 1.5 (coal), and appear to represent the collapse of isolated, uncorrelated cavities. A significant increase of the acoustic emission, AE, activity was observed close to the final failure event, which acts as "warning signal" for the impending major collapse. Waiting times between events also follow power law distributions with exponents 2+x between 2 and 2.4. Aftershocks occur with probabilities described by Omori coefficients p between 0.84 (sandstone) and 1 (coal). The "Båth's law" predicts that the ratio between the magnitude of the main event and the largest aftershock is 1.2.Our experimental findings confirm this conjecture. Our results imply that acoustic warning methods are often possible within the context of mining safety measures, although it is not only the increase of crackling noise that can be used as early warning signal but also the change of the energy distribution of the crackling events.

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Thermal and acoustic noises generated by austenite/martensite transformation in NiFeGaCo single crystals

Cited by 20 publications

References 27 publications

Simultaneous investigation of thermal, acoustic, and magnetic emission during martensitic transformation in single-crystallineNi2MnGa

Simultaneous investigation of thermal, acoustic, and magnetic emission during martensitic transformation in single-crystallineNi2MnGa

Effect of Stress-Induced Martensite Stabilization on Acoustic Emission Characteristics and the Entropy of Martensitic Transformation in Shape Memory Ni51Fe18Ga27Co4 Single Crystal

Collapsing minerals: Crackling noise of sandstone and coal, and the predictability of mining accidents

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