A multiscale study of hot-extruded CoNiGa ferromagnetic shape-memory alloys

Samothrakitis, Stavros; Larsen, Camilla Buhl; Woracek, Robin; Heller, Luděk; Kopeček, Jaromı́r; Gerstein, Gregory; Maier, Hans Jürgen; Rameš, Michal; Tovar, Michael; Šittner, Petr; Schmidt, Søren; Ströbl, Markus

doi:10.1016/j.matdes.2020.109118

Cited by 9 publications

(7 citation statements)

References 42 publications

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“…These properties make them promising candidates for various applications such as actuators, sensors and magnetic refrigeration. While CoNiGa single crystals exhibit remarkable stability during cyclical transformation between cubic austenite (B2) and tetragonal martensite (L1 0 ) (Chernenko et al, 2004), the ductility and toughness of polycrystalline CoNiGa alloys are reduced (Samothrakitis et al, 2020a). This results in premature failure at grain boundaries and intergranular cracking under thermo-mechanical loading, attributed to the high density of grain boundaries and triple points within the samples, as well as the anisotropic volume change displayed by randomly oriented grains.…”

Section: Example Indexing and Grain Morphology Reconstruction: Coniga...mentioning

confidence: 99%

The FALCON double-detector Laue diffractometer add-on for grain mapping at POLDI

Samothrakitis,

Larsen,

Kaestner

et al. 2023

J Appl Cryst

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Laue 3D neutron diffraction tomography (Laue 3DNDT) is a novel tomographic approach that enables non-destructive resolution of the 3D microstructure of polycrystalline materials, utilizing a high-intensity white beam of neutrons, resulting in high experimental efficiency. This article describes the functionality of the fast-acquisition Laue camera for neutrons (FALCON), a double-detector system setup used for Laue 3DNDT experiments at the pulse-overlap diffractometer (POLDI) at the SINQ neutron source of the Paul Scherrer Institute. The reported commissioning includes standard experimental protocols, strategies for acquiring data and a detailed characterization of the measurement system. Finally, single-crystal measurements for calibration and a full grain map of a CoNiGa oligocrystalline sample, extracted from a pilot study, are presented. A detailed understanding of the performance of the FALCON instrumentation is vital for the future advancement of the Laue 3DNDT algorithm, including, but not limited to, improved morphology reconstructions and strain mapping.

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Section: Example Indexing and Grain Morphology Reconstruction: Coniga...mentioning

confidence: 99%

The FALCON double-detector Laue diffractometer add-on for grain mapping at POLDI

Samothrakitis,

Larsen,

Kaestner

et al. 2023

J Appl Cryst

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“…They found that this single crystal can spontaneously twin upon the application of an external field, showing the orientation relation between the untwinned and twinned regions, together with their specific morphology and the mosaic microstructure of the original crystal. Samothrakitis et al [96] investigated the 3D microstructure of a hot-extruded Co 49 Ni 21 Ga 30 FSMA by neutron diffraction tomography. They found that no preferred crystallographic orientations can be appreciated in the nearly spherical grains observed in the sample.…”

Section: Radiography/tomographymentioning

confidence: 99%

Neutron Scattering as a Powerful Tool to Investigate Magnetic Shape Memory Alloys: A Review

Río-López

Lázpita

Salazar

et al. 2021

Metals

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Magnetic shape memory alloys (MSMAs) are an interesting class of smart materials characterized by undergoing macroscopic deformations upon the application of a pertinent stimulus: temperature, stress and/or external magnetic fields. Since the deformation is rapid and contactless, these materials are being extensively investigated for a plethora of applications, such as sensors and actuators for the medical, automotive and space industries, energy harvesting and damping devices, among others. These materials also exhibit a giant magnetocaloric effect, whereby they are very promising for magnetic refrigeration. The applications in which they can be used are extremely dependent on the material properties, which are, in turn, greatly conditioned by the structure, atomic ordering and magnetism of a material. Particularly, exploring the material structure is essential in order to push forward the current application limitations of the MSMAs. Among the wide range of available characterization tools, neutron scattering techniques stand out in acquiring advanced knowledge about the structure and magnetism of these alloys. Throughout this manuscript, a comprehensive review about the characterization of MSMAs using neutron techniques is presented. Several elastic neutron scattering techniques will be explained and exemplified, covering neutron imaging techniques—such as radiography, tomography and texture diffractometry; diffraction techniques—magnetic (polarized neutron) diffraction, powder neutron diffraction and single crystal neutron diffraction, reflectometry and small angle neutron scattering. This will be complemented with a few examples where inelastic neutron scattering has been employed to obtain information about the phonon dispersion in MSMAs.

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“…Rod [147,204,310] Cylindrical bar [180,220,296,310] Cable [93,94,106,119] Tube [38,49,64,65,70,121,123,194,195,207,271,294,302] Film/foil […”

Section: Conclusion and Suggestions For Future Workmentioning

confidence: 99%

“…[ 160] [ 148] Rod [204] [ 147,204] [ 310] [ 204] Cylindrical bar [220,296] [ 302] [ 220] Tube [121] [ 38,194,204,207…”

Section: Conclusion and Suggestions For Future Workmentioning

confidence: 99%

Applying Full-Field Measurement Techniques for the Thermomechanical Characterization of Shape Memory Alloys: A Review and Classification

Delpueyo

Jury

Balandraud

et al. 2021

Shap. Mem. Superelasticity

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Full-field measurement techniques are now mature. As such, they have profoundly impacted the experimental mechanics community in recent years. The way that shape memory alloys (SMAs) are now tested is not spare from this deep-rooted trend, as reflected by the increasing number of papers published in the SMA literature. In this context, the aim of this contribution is to give an overview of the use of full-field measuring techniques for SMA characterization purposes. We recall first the basic principle of one volume and four surface techniques employed in this community. Several typical papers where such techniques are employed are then presented, by highlighting in each case the extent to which the thermomechanical response of SMAs could be better understood and modeled thanks to these techniques. A classification by several criteria of about 300 references is finally offered and discussed. The main criteria are the type of SMA, the type of technique employed to perform the measurements, and the type of test.

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A multiscale study of hot-extruded CoNiGa ferromagnetic shape-memory alloys

Cited by 9 publications

References 42 publications

The FALCON double-detector Laue diffractometer add-on for grain mapping at POLDI

The FALCON double-detector Laue diffractometer add-on for grain mapping at POLDI

Neutron Scattering as a Powerful Tool to Investigate Magnetic Shape Memory Alloys: A Review

Applying Full-Field Measurement Techniques for the Thermomechanical Characterization of Shape Memory Alloys: A Review and Classification

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