Control of intrinsic instability of superelastic deformation

Slutsker, Julia

doi:10.1016/s0749-6419(02)00029-3

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…They form below the M s and can be heated up above the M s . 9,10,12,13 We still use this term, however, to name a conceptually similar but different equilibrium describing a mixed state consisting of nanosized embryos above the M s . This paper shows that a material in the nanoembryonic equilibrium may have anhysteretic giant responses to external stimuli such as superelasticity 14 and supermagnetostriction, 15,16 and the nanoembryonic mechanism could, at least partly, explain the existence of diffuse phase transformations (DPT), 17 negative thermal expansion coefficients, elastic softening upon cooling and their particular cases, Invar 18,19 and Elinvar 18,19 effects.…”

Section: Introductionmentioning

confidence: 99%

Nanoembryonic thermoelastic equilibrium and enhanced properties of defected pretransitional materials

Rao

Morris

et al. 2018

npj Comput Mater

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Behaviors of displacive phase-transforming materials above the temperature of transformation, where abnormal thermal, elastic, magnetic properties are often observed, are mostly explained by intrinsic peculiarities in electronic/atomic structure. Here, we show these properties may also be attributed to extrinsic effects caused by a thermoelastic equilibrium in highly defected pretransitional materials. We demonstrate that the stress concentration near stress-generating defects such as dislocations and coherent precipitates could result in the stress-induced transformation within nanoscale regions, producing equilibrium embryos of the product phase. These nanoembryos in thermoelastic equilibrium could anhysteretically change their equilibrium size in response to changes in applied stress or magnetic fields leading to superelasticity or supermagnetostriction. Similar response to cooling may explain the observed diffuse phase transformation, changes in the coefficient of thermal expansion and effective elastic modulus, which, in turn, may explain the invar and elinvar behaviors.

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Section: Introductionmentioning

confidence: 99%

Nanoembryonic thermoelastic equilibrium and enhanced properties of defected pretransitional materials

Rao

Morris

et al. 2018

npj Comput Mater

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“…which is about three times as large as the compliance of single domain phases. A similar softening effect exists for heterophase polydomain structures formed in martensitic transformations [105,106]. For ferroelectric materials, this mechanical softening effect due to domain fraction change is accompanied by change of the average polarization P n and results in a stress-induced extrinsic piezoelectric effect.…”

Section: Extrinsic Propertiesmentioning

confidence: 68%

Polydomain structures in ferroelectric and ferroelastic epitaxial films

Roytburd

Ouyang

Artemev

2017

J. Phys.: Condens. Matter

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A review of theoretical models, phase field modeling and experimental studies of domain structures in epitaxial films is presented. The thermodynamic theory of such domain structures is presented within the macroscopic thermo-mechanical framework. The theory allows for the evaluation of the main parameters of the domain structure using the energy minimization approach applied to the energy of elastic interactions. For homophase (polytwin) films, the thermodynamic theory provides a quantitative tool that can be used to estimate domain fractions in the film and the type of domain structure architecture. For heterophase films, the theory describes (a) the conditions under which two-phase structures can be obtained in epitaxial films, and (b) the phase and domain fractions in these films. The thermodynamic theory can also be used to describe the extrinsic contributions from domain structures to the functional properties of epitaxial ferroelectric films. The review of phase field modeling demonstrates that computational results reproduce the predictions of the thermodynamic theory. It is also shown that the phase field modeling that utilizes the energy minimization procedure for elastic and interfacial energies can be used to predict domain morphology for the films with two-phase structures produced either by phase transformation or through the co-deposition of immiscible phases. The experimental data presented in the review validate predictions of the thermodynamic model and the results of phase field modeling.

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