An acoustic emission study of the effect of a magnetic field on the martensitic transition in Ni2MnGa

Ludwig, Benno; Strothkaemper, Christian; Klemradt, Uwe; Moya, Xavier; Mañosa, Lluı́s; Vives, Eduard; Planes, Antoni

doi:10.1063/1.3103289

Cited by 21 publications

(21 citation statements)

References 15 publications

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“…Our results can also be compared with acoustic emission measurements of Ludwig et al [2], as well as Niemann et al [3] where α = 2.6 and ε = 1.75 [2] as well as ε = 1.9 ± 0.1 [3] were obtained at zero external field in Ni 52 Mn 23 Ga 25 . It can be concluded that the agreement is quite good.…”

Section: Discussionsupporting

confidence: 50%

“…The evaluation method was similar to the one used in Ref. [2]. Since the heating and cooling were done in the DSC, it was possible to measure thermal signals simultaneously with acoustic emission.…”

Section: B Acoustic Emission Measurementsmentioning

confidence: 99%

“…Regarding Ni 2 MnGa ferromagnetic alloys (with 10M structure) AE measurements of thermally induced transformation were investigated as a function of the external magnetic field [2] as well compressive stress [3] and it was obtained that variant multiplicity (which was well controlled by the different levels of the constant external fields applied) has influence on the critical exponents. α and ε showed about 25% decrease with increasing field.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time the authors of Refs. [2,3] did not mention any effect of thermal cycling on critical exponents.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, during the jerky propagation of interfaces avalanches are created and their individual peaks can be separated if the cooling rate is slow enough and then a statistical analysis of them is possible [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Calorimetric and acoustic emission study of martensitic transformation in single-crystallineNi2MnGaalloys

et al. 2014

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The jerky character of austenite-martensite phase transformation in Ni 2 MnGa single crystals (with 10M martensite structure) has been investigated by thermal cycling using a differential scanning calorimeter (DSC) and by detection of acoustic emissions (AEs) at low cooling and heating rates (0.1 K/min and below). It is illustrated that, besides the low cooling and heating rate, mass and surface roughness are also important parameters in optimizing the best signal/noise ratio in order to obtain individual peaks suitable for statistical analysis. Three types of samples, differing in the twin structure and twin boundary behavior, were investigated with and without surface roughening made by electro-erosion. The statistical analysis, carried out for both (thermal and acoustic) types of signals, provided power-law behavior. In calorimetric measurements the energy exponents, obtained in cooling, were the same within the experimental errors (ε = 1.7 ± 0.2) for the three samples investigated. In acoustic emission experiments the energy and amplitude, α, exponents were determined both for cooling and heating. The exponents for cooling and heating runs are slightly different. They are larger for heating for both α and ε, in accordance with the asymmetric acoustic activity: we observed higher acoustic activity (higher number of hits) during cooling. The effect of the surface roughness is negligible in the exponents (but higher acoustic activity corresponds to higher roughness) and the following values were obtained: ε = 1.5 ± 0.1 and α = 2.1 ± 0.1 for cooling as well as ε = 1.8 ± 0.1 and α = 2.6 ± 0.1 for heating. Our results are in accordance with the results of Gallardo et al. [Phys. Rev. B 81, 174102 (2010)

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Section: Discussionsupporting

confidence: 50%

Section: B Acoustic Emission Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…At the same time the authors of Refs. [2,3] did not mention any effect of thermal cycling on critical exponents.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calorimetric and acoustic emission study of martensitic transformation in single-crystallineNi2MnGaalloys

et al. 2014

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Correlation between Acoustic Emission and Stress Evolution during Single Twin Boundary Motion in Ni–Mn–Ga Magnetic Shape Memory Single Crystal

Perevertov

Ševčík

Heczko

2022

Physica Rapid Research Ltrs

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Stress evolution and related acoustic emission (AE) in modulated 10M martensite are simultaneously studied during compression forced motion of Type I and Type II single twin boundary (TB) resulting in microstructure reorientation and large deformation. The single TB of both types is formed in the same sample and traveled the same volume. The single boundary exhibits random jerky movement and for Type I the stress fluctuation can be directly correlated to AE signal. The AE during the single TB motion is an avalanche‐like process surmounting the obstacles – crystal defects. The amplitudes of AE are approximately five times higher for Type I compared to Type II. The energy amplitudes of AE events follow the universal power law with different coefficients for Type I and Type II TB. The peak rate well correlates with stress fluctuation during TB motion. Large differences observed for the same sample indicate a different mechanism of pinning and ultimately a different mechanism of Type I and Type II TB motion.

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Metastability, Hysteresis, Avalanches, and Acoustic Emission: Martensitic Transitions in Functional Materials

Rosinberg

Vives

2011

Springer Series in Materials Science

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I INTRODUCTIONFunctional materials are based on the interplay of different ferroic properties like ferroelasticity, ferromagnetism, ferroelectricity, etc. In order to obtain a sufficiently large response to the external excitation, these materials are typically tuned so to cross a first-order phase transition in which one or several order parameters (strain, magnetization, polarization, etc…) exhibit a macroscopic discontinuity. It is thus important for applications to understand the dynamics of first-order phase transitions (FOPT) in such materials.FOPT in solids hardly occur at thermal equilibrium. Typically, the energy barriers involved in the transition are very large compared to thermal fluctuations so that the order parameters evolve following metastable trajectories. The transitions are then called athermal, and instead of being sharp like in ideal first-order phase transitions, they extend over a broad range of the driving parameter and show hysteresis. In many cases the hysteresis (or at least a part of it) cannot be suppressed by driving the system more slowly because it is not related to the fact that the system cannot respond instantaneously due to relaxational delay. This kind of hysteresis is usually called rateindependent hysteresis.The high energy barriers have two origins: on the one hand, real materials always exhibit some amount of quenched disorder that determines the nucleation sites and can thus strongly affect the metastable path. On the other hand, when one of the order parameters involved in the transition is strain (like in martensitic transformations), a

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An acoustic emission study of the effect of a magnetic field on the martensitic transition in Ni2MnGa

Cited by 21 publications

References 15 publications

Calorimetric and acoustic emission study of martensitic transformation in single-crystallineNi2MnGaalloys

Calorimetric and acoustic emission study of martensitic transformation in single-crystallineNi2MnGaalloys

Correlation between Acoustic Emission and Stress Evolution during Single Twin Boundary Motion in Ni–Mn–Ga Magnetic Shape Memory Single Crystal

Metastability, Hysteresis, Avalanches, and Acoustic Emission: Martensitic Transitions in Functional Materials

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