Simultaneous investigation of thermal, acoustic, and magnetic emission during martensitic transformation in single-crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Ni</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:mtext>MnGa</mml:mtext></mml:mrow></mml:math>

Tóth, László Zoltán; Daróczi, Lajos; Szabó, S.; Beke, Dezső L.

doi:10.1103/physrevb.93.144108

Cited by 17 publications

(59 citation statements)

References 32 publications

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“…[11] from deformation generated twin boundary motions in the same alloys at zero external magnetic field (second row). It can be seen that the corresponding critical exponents of ME and AE are very close to each other, which is in good accordance with the results of simultaneous measurement of AE and ME during austenite/martensite phase transformation in the same alloy [18].…”

Section: Critical Exponents Of Magnetic Noises Due To Magnetic Domainsupporting

confidence: 87%

“…The acoustic signals are detected by a MICRO80 piezoelectric sensor produced by Physical Acoustic Corp. (For the details of the noise detections and data collection, see also Refs. [10,11,18]. )…”

Section: Methodsmentioning

confidence: 99%

“…[41] for the investigation of inhomogeneous temporal processes, consisting of highactivity bursty intervals alternating with long low-activity periods. This is based on the comparison of the experimentally determined P (n; t m ) functions with the P ind (n; t m ) distributions [18,21,41]…”

Section: E Time Correlationsmentioning

confidence: 99%

“…Indeed, it was shown that AE can be evoked, for example, by austenite/martensite phase transformations [17][18][19][20] and plastic deformations [10,11,21,22] too. The above noises, indicating the behavior near a critical point, can be characterized by powerlike distribution functions [17,23],…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, simultaneously with the AE noise, we also detected magnetic emission (ME) signals during the same process. This will make possible the comparison of the critical exponents of ME and AE like it was done for the noises emitted during austenite/martensite phase transformation in the same alloy [18]. Comparing the critical exponents of ME signals obtained from periodic bending deformation of martensitic Ni 2 MnGa samples [10,11] and from magnetic field induced detwinning, we can check whether the critical exponents of the ME noises are the same for the two different modes of excitations (strain or magnetic field induced detwinning).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field induced random pulse trains of magnetic and acoustic noises in martensitic single-crystal Ni2MnGa

et al. 2017

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Jerky magnetic and acoustic noises were evoked in a single variant martensitic Ni 2 MnGa single crystal (produced by uniaxial compression) by application of an external magnetic field along the hard magnetization direction. It is shown that after reaching the detwinning threshold, spontaneous reorientation of martensite variants (twins) leads not only to acoustic emission but magnetic two-directional noises as well. At small magnetic fields, below the above threshold, unidirectional magnetic emission is also observed and attributed to a Barkhausen-type noise due to magnetic domain wall motions during magnetization along the hard direction. After the above first run, in cycles of decreasing and increasing magnetic field, at low-field values, weak, unidirectional Barkhausen noise is detected and attributed to the discontinuous motion of domain walls during magnetization along the easy magnetization direction. The magnetic noise is also measured by constraining the sample in the same initial variant state along the hard direction and, after the unidirectional noise (as obtained also in the first run), a two-directional noise package is developed and it is attributed to domain rotations. From the statistical analysis of the above noises, the critical exponents, characterizing the power-law behavior, are calculated and compared with each other and with the literature data. Time correlations within the magnetic as well as acoustic signals lead to a common scaled power function (with β = −1.25 exponent) for both types of signals.

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Section: Critical Exponents Of Magnetic Noises Due To Magnetic Domainsupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: E Time Correlationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic field induced random pulse trains of magnetic and acoustic noises in martensitic single-crystal Ni2MnGa

et al. 2017

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Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena

Martín-Olalla,

Vidal-Crespo,

Romero

et al. 2024

J Therm Anal Calorim

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We study the thermal properties of a bulk $$\hbox {Ni}_{55}\hbox {Fe}_{19}\hbox {Ga}_{26}$$ Ni 55 Fe 19 Ga 26 Heusler alloy in a conduction calorimeter. At slow heating and cooling rates ($$\sim {1}\,\hbox {K h}^{-1}$$ ∼ 1 K h - 1 ), we compare as-cast and annealed samples. We report a smaller thermal hysteresis after the thermal treatment due to the stabilization of the 14 M modulated structure in the martensite phase. In ultraslow experiments ($${40}\,\hbox {mK h}^{-1}$$ 40 mK h - 1 ), we detect and analyze the calorimetric avalanches associated with the direct and reverse martensitic transformation from cubic to 14 M phase. This reveals a distribution of events characterized by a power law with exponential cutoff $$p(u)\propto u^{-\varepsilon }\exp (-u/\xi )$$ p ( u ) ∝ u - ε exp ( - u / ξ ) where $$\varepsilon \sim 2$$ ε ∼ 2 and damping energies $$\xi ={370}{\upmu {\rm J}}$$ ξ = 370 μ J (direct) and $$\xi ={27}{\upmu {\rm J}}$$ ξ = 27 μ J (reverse) that characterize the asymmetry of the transformation.

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Acoustic Emission During Austenite → ε Martensitic Phase Transformation in TWIP/TRIP Steels

Bolgár

Nagy

Daróczi

et al. 2019

Metall Mater Trans A

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Acoustic emission in two different TWIP/TRIP steels during thermally induced c-e martensitic phase transformation was investigated. Large asymmetry was observed: the noise activity was considerably larger for heating than cooling. This was explained by the plastic deformation and strain-induced martensite nucleation (which usually provides much lower acoustic emission signals) in the austenite during cooling. The amplitude and energy probability distribution functions for heating followed the power-law behavior, and the critical exponents were counted as well. The amplitude and energy exponents (a and e, respectively) for the two different samples were the same within the errors (a = 2.4 ± 0.2, e = 1.7 ± 0.1), indicating the universal character. The acoustic activity vs martensite volume faction showed a maximum at around 60 pct for heating, which is most probably related to the coming apart of the elastic fields of the martensite variants.

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

Cited by 17 publications

References 32 publications

Magnetic field induced random pulse trains of magnetic and acoustic noises in martensitic single-crystal Ni2MnGa

Magnetic field induced random pulse trains of magnetic and acoustic noises in martensitic single-crystal Ni2MnGa

Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena

Acoustic Emission During Austenite → ε Martensitic Phase Transformation in TWIP/TRIP Steels

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