A new mechanism for low and temperature-independent elastic modulus

Zhang, Liangxiang; Wang, Dong; Ren, Xiaobing

doi:10.1038/srep11477

Cited by 39 publications

(16 citation statements)

References 49 publications

(64 reference statements)

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“…This is the so-called elinvar effect. 19,32,33 Therefore, the dependence of the equilibrium ω on temperature can be an important source of both invar and elinvar effects.…”

Section: Resultsmentioning

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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“…This is the so-called elinvar effect. 19,32,33 Therefore, the dependence of the equilibrium ω on temperature can be an important source of both invar and elinvar effects.…”

Section: Resultsmentioning

confidence: 99%

Nanoembryonic thermoelastic equilibrium and enhanced properties of defected pretransitional materials

Rao

Morris

et al. 2018

npj Comput Mater

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“…Note that CMs at the nanometer scales can be achieved not only by spinodal decomposition [39,[80][81][82][83] but also by nano-precipitates in the parent phase under under-aged conditions, i.e., growing precipitates with their diffusion fields just start to overlap [84][85][86][87]. Thus the current study suggests ample opportunities for developing novel SMAs with slim hysteresis, quasi-linear pseudo-elasticity with large work output, ultra-low apparent elastic modulus and Invar and Elinvar anomalies [19,36,88,89]. It also shows that the SGT is not a necessary condition to produce broadly smeared MTs.…”

Section: Comparison With Strain Glass Transitionmentioning

confidence: 75%

Taming martensitic transformation via concentration modulation at nanoscale

et al. 2017

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Martensitic transformation (MT) is typically a strongly first-order transition with autocatalysis in nucleation followed by rapid growth. It usually takes place within a narrow temperature or stress range, making its utilization in a controllable manner difficult. We show by computer simulations how MTs can be tailored by concentration modulation at the nanoscale in the parent phase, which induces spatial variations of both the stability of martensite and the transformation strain and tunes the overall MT kinetics from a typical first-order transition into a high-order like continuous transition. Such a unique MT characteristic reduces or even eliminates the transformation hysteresis and produces quasi-linear elasticity with ultra-low apparent elastic modulus.

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“…Details on the modeling can refer to previous papers. [44][45][46][47] Figure 5a, b shows a striking similarity between the simulated and experimental phase diagrams of strain glass. 44,48 The simulated phase diagram based the model well reproduce the most important features of a ferroic glass system: (I) a crossover from a normal ferroic transformation to a glass transition at a critical defect concentration; (II) the existence of a precursor state or tweed state below a critical temperature T nd .…”

Section: Models Of Ferroic Glasses and A Generic Ferroic Glass Phase mentioning

confidence: 88%

“…Recently, Wang et al have provided rigorous modeling and phase field simulation on both strain glass [44][45][46] and relaxor, 47 and their results reproduce all known features of strain glass and relaxor including the experimental phase diagram. [44][45][46][47] According to their model two effects caused by point defects were important (Fig. 4): (I) global transition temperature effect (GTTE) which changes the global thermodynamic stability of ferroic phase; (II) local field effect (LFE) which changes the local stability and breaks the local symmetry.…”

Section: Models Of Ferroic Glasses and A Generic Ferroic Glass Phase mentioning

confidence: 96%

Ferroic glasses

Wang

et al. 2017

npj Comput Mater

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Ferroic glasses (strain glass, relaxor and cluster spin glass) refer to frozen disordered states in ferroic systems; they are conjugate states to the long-range ordered ferroic states-the ferroic crystals. Ferroic glasses exhibit unusual properties that are absent in ferroic crystals, such as slim hysteresis and gradual property changes over a wide temperature range. In addition to ferroic glasses and ferroic crystals, a third ferroic state, a glass-ferroic (i.e., a composite of ferroic glass and ferroic crystal), can be produced by the crystallization transition of ferroic glasses. It can have a superior property not possessed by its two components. These three classes of ferroic materials (ferroic crystal, ferroic glass and glass-ferroic) correspond to three transitions (ferroic phase transition, ferroic glass transition and crystallization transition of ferroic glass, respectively), as demonstrated in a generic temperature vs. defectconcentration phase diagram. Moreover, through constructing a phase field model, the microstructure evolution of three transitions and the phase diagram can be reproduced, which reveals the important role of point defects in the formation of ferroic glass and glass-ferroic. The phase diagram can be used to design various ferroic glasses and glass-ferroics that may exhibit unusual properties. 1 are a generic name for ferromagnets, ferroelectrics, and ferroelastics, as well as very recently reported ferrotoroidics.2 They originate from a disorder-order ferroic phase transition at a critical temperature (T c ) and have a long-range ordering of magnetic moment in ferromagnets, electric dipole in ferroelectrics, or lattice strain in ferroelastics below T c (ref. 1). The ordering or symmetry-breaking leads to degenerate states of equivalent domains with the same free energy but different orientations, and in order to minimize the internal energy ferroics naturally possess a multi-domain configuration. Under the external stimuli (such as magnetic/electric/mechanical field, temperature), they exhibit many technologically important phenomena such as a hysteresis loop (a switching behavior between different domains) and magnetic/electric/mechanical strain coupling, and have a wide range of applications as memory devices, actuators, sensors, transduces, etc.1,3-7 However, because of the first-order nature, 1,3-9 the hysteresis is usually quite large especially in ferroelastics and ferroelectrics, 3-7 leading to energy loss and fatigue issues. Moreover, a normal ferroic transition renders many of the interesting properties of ferroic crystals (e.g., superelasticity) that are achievable only in a narrow temperature window around the transition temperature. In this review, we show other two classes of ferroic materials: ferroic glass and glassferroic. The former has unique properties that overcome these drawbacks in the ferroic crystal, whereas the latter can exhibit some superior property combination of its two components. Furthermore, experimental and simulated results have revealed a generic...

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A new mechanism for low and temperature-independent elastic modulus

Cited by 39 publications

References 49 publications

Nanoembryonic thermoelastic equilibrium and enhanced properties of defected pretransitional materials

Nanoembryonic thermoelastic equilibrium and enhanced properties of defected pretransitional materials

Taming martensitic transformation via concentration modulation at nanoscale

Ferroic glasses

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