The effect of electronic and magnetic valences on the martensitic transformation of CoNiGa shape memory alloys

Dogan, E.; Караман, И.; Singh, Navdeep; Chivukula, Avinash. R.; Thawabi, Hassan S.; Arróyave, Raymundo

doi:10.1016/j.actamat.2012.02.044

Cited by 29 publications

(18 citation statements)

References 48 publications

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“…In contrast, large atomic relaxations in Ni-rich compositions due to anti-site led to a steep decrease in energy difference between B2 and B19 0 , resulting in a dramatic decrease in transformation temperatures, again in agreement with experiments [69]. One of the authors of the present paper used DFT methods to investigate the phase competition between austenite and martensite in the Co-Ni-Ga system [9] and found that an increase in the valence electron-to-atom ratio (e/a) was associated with an increase in the energy difference between austenite (L 21 ) and martensite (L 10 ) in this system as shown in Fig. 11, in qualitative agreement with experiments.…”

Section: Ab Initio-based Thermodynamics Of Htsmassupporting

confidence: 82%

“…11, in qualitative agreement with experiments. One must note, however, than in this case, magnetism was found to play an equally important role in determining the energy difference between austenite and martensite, resulting in the transformation temperature (M S ) being a function of both e/a ratio and the effective magnetic valence of the alloy [9].…”

Section: Ab Initio-based Thermodynamics Of Htsmasmentioning

confidence: 92%

“…First, our understanding of the effects of chemistry and microstructure on the transformation behavior and performance of HTSMAs is still incomplete, particularly when considering performance metrics related to the long-term functional reliability of HTSMA-enabled devices. Furthermore, despite the fact that there is significant research activity [5] on different aspects related to the development of HTSMAs, most of the efforts have focused on a rather limited number of systems (such as NiTi-Hf/Zr [6,7], Co-Ni-Ga [8,9], NiTi-Pd/Pt [10], Ti-Ta [11], etc.). While computational and theoretical tools at multiple scales, ranging from the electronic structure level [12] to the continuum [13], have contributed to a better understanding of specific phenomena related to the phase-stability or phase-transformation behaviors of HTSMAs, there are only a few efforts that have sought to integrate models at multiple scales [14].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Computational Thermodynamics and Kinetics-Based ICME Framework for High-Temperature Shape Memory Alloys

Arróyave

Talapatra

Johnson

et al. 2015

Shap. Mem. Superelasticity

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Over the last decade, considerable interest in the development of High-Temperature Shape Memory Alloys (HTSMAs) for solid-state actuation has increased dramatically as key applications in the aerospace and automotive industry demand actuation temperatures well above those of conventional SMAs. Most of the research to date has focused on establishing the (forward) connections between chemistry, processing, (micro)structure, properties, and performance. Much less work has been dedicated to the development of frameworks capable of addressing the inverse problem of establishing necessary chemistry and processing schedules to achieve specific performance goals. Integrated Computational Materials Engineering (ICME) has emerged as a powerful framework to address this problem, although it has yet to be applied to the development of HTSMAs. In this paper, the contributions of computational thermodynamics and kinetics to ICME of HTSMAs are described. Some representative examples of the use of computational thermodynamics and kinetics to understand the phase stability and microstructural evolution in HTSMAs are discussed. Some very recent efforts at combining both to assist in the design of HTSMAs and limitations to the full implementation of ICME frameworks for HTSMA development are presented.

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Section: Ab Initio-based Thermodynamics Of Htsmassupporting

confidence: 82%

Section: Ab Initio-based Thermodynamics Of Htsmasmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computational Thermodynamics and Kinetics-Based ICME Framework for High-Temperature Shape Memory Alloys

Arróyave

Talapatra

Johnson

et al. 2015

Shap. Mem. Superelasticity

Self Cite

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“…By holding the composition constant in the alloy under investigation, i.e. Ni 45 Co 5 Mn 36.6 In 13.4 magnetic shape memory alloy (MSMA), the strain glass / cluster spin glass is examined in this work without affecting the alloy"s electron-to-atom ratio (e/a ratio) or magnetic valence that have considerable influence on its properties [26][27][28]. Different degrees of configurational order, which produce different defect concentrations and distributions, were achieved in this off-stoichiometric Heusler alloy through heat treatments between 673 K and 1073 K. It is will be shown here in the present work that these heat treatments affect the material"s configurational order and point defect concentration of the material which enhances T C and T f , suppresses T Ms and ultimately stabilizes the formation of a strain glass phase.…”

Section: Alloy Selectionmentioning

confidence: 99%

Multiple ferroic glasses via ordering

Monroe

Raymond

et al. 2015

Acta Materialia

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Structural glasses are characterized by the loss of long-range translational and rotational symmetry. In the last two decades, however, it has been discovered that materials that exhibit ferroic (ferromagnetic, ferroelectric and ferroelastic) phase transformations may also exhibit glassy behavior, in which the ferroic degrees of freedom (magnetization, polarization, strain) exhibit a loss of long-range translational symmetry. A consequence of this loss of longrange symmetry is the suppression of the ferroic phase transitions. Moreover, these unique glassy systems exhibit dynamic and thermodynamic behavior analogous to regular structural glasses.Conventionally, the onset of glassy behavior is brought about by the introduction of spatial heterogeneities, typically originating from point defects, particularly in the case of strain glasses.Here, we demonstrate, for the first time, that configurational order/disorder in a single ferromagnetic alloy (Ni 45 Co 5 Mn 36.6 In 13.4 ) can be used to stabilize both strain and magnetic glasses. The control of the degree of configurational order--through simple heat treatment schedules--, and simultaneous application of stress and magnetic field enabled us to observe a Kauzmman point, that is, the collapse of the entropy difference between a crystalline and a glassy phase. Systematic investigation of the transformation behavior in this system as a function of heat treatment enabled us to observe four kinds of solid-solid phase transitions (ferromagnetic-paramagnetic, martensitic transformation, strain and magnetic glass) in a single composition. The alloy investigated can be used to further elucidate the nature of ferroic glass transitions and their coupling.

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“…Since Ullakko et al [21] discovered large magnetic field-induced strains (MFISs) in Heusler alloy Ni 2 MnGa single crystal in 1996, many Heusler alloys have been investigated extensively such as NiMnZ (Z = In, Sn, Sb, Al) [22][23][24], NiCoMnZ (Z = In, Sn, Sb, Al, Ga) [6,25,26], Ni 2 FeZ [27][28][29][30][31], Mn 2 NiZ [32,33], Fe 2 MnZ [34,35], and Co 2 NiZ [36][37][38]. This kind of MFISs exhibit many merits, such as large strain, high work output, high response frequency, and tunable working temperature.…”

Section: Introductionmentioning

confidence: 99%

Recent progress in Heusler-type magnetic shape memory alloys

Liu

et al. 2015

Rare Met.

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Magnetic shape memory alloys (MSMAs), both in condensed matter physics and in material science, are one of the most extensive research subjects. They show prompt response to the external magnetic field and give rise to large strain and have fine reversibility. The well-known example is Heusler-type MSMAs, which possess excellent multifunctional properties and have potential applications in energy transducer, actuator, sensor, microelectromechanical system, and magnetic refrigerator. In this paper, it is shown the recent progress in magnetostructural transformation, magnetic properties, shape deformation, magnetocaloric effect as well as magnetic field-induced shape memory effect in Ni-Mn-Ga, NiMnZ (Z = In, Sn, Sb), and NiCoMnZ (Z = In, Sn, Sb, Al) Heusler-type MSMAs. The remaining issues and possible challenges are briefly discussed.

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The effect of electronic and magnetic valences on the martensitic transformation of CoNiGa shape memory alloys

Cited by 29 publications

References 48 publications

Computational Thermodynamics and Kinetics-Based ICME Framework for High-Temperature Shape Memory Alloys

Computational Thermodynamics and Kinetics-Based ICME Framework for High-Temperature Shape Memory Alloys

Multiple ferroic glasses via ordering

Recent progress in Heusler-type magnetic shape memory alloys

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