Thermal trapping and kinetics of martensitic phase boundaries

Ngan, Shing-Chung; Truskinovsky, Lev

doi:10.1016/s0022-5096(98)00080-5

Cited by 40 publications

(21 citation statements)

References 19 publications

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“…An athermal threshold appears in phase field theory when the latent heat of transformation is taken into account (Ngan and Truskinovsky, 1999). Allowance for microinertia related to the strain tensor also produces a threshold (Theil and Levitas, 2000).…”

Section: Introductionmentioning

confidence: 99%

Interface propagation and microstructure evolution in phase field models of stress-induced martensitic phase transformations

Levitas

Lee

Preston

2010

International Journal of Plasticity

135

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Section: Introductionmentioning

confidence: 99%

Interface propagation and microstructure evolution in phase field models of stress-induced martensitic phase transformations

Levitas

Lee

Preston

2010

International Journal of Plasticity

135

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“…On the other hand, we show here that the phase separation process gives rise to a further step in the switching dynamics, related to the phase boundary motion(s). This process is driven primarily by the elastic stress [22], but controlled in a complex manner by the movement of dislocations as well as by the presence of latent heat [24].…”

mentioning

confidence: 99%

Triggering a Phase Transition by a Spatially Localized Laser Pulse: Role of Strain

et al. 2012

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We report here the optical microscopic imaging of a first-order phase transition induced by a nanosecond laser pulse (532 nm) in a single crystal of the molecular spin-crossover complex [FeðbapbpyÞðNCSÞ 2 ]. The transition starts with the formation of a high spin domain in the region irradiated by the focused laser beam, followed by the subsequent growth or contraction of the initial domain. Remarkably, in otherwise identical experimental conditions one can observe either the irreversible transition of the whole crystal or merely the formation of a transient domain-depending on which region of the crystal is excited. This observation as well as the rather slow dynamics suggest that the main control parameter is the inhomogeneous accommodation strain, which destabilizes the photoinduced domain. DOI: 10.1103/PhysRevLett.109.135702 PACS numbers: 64.70.KÀ, 07.60.Pb, 64.60.My, 75.30.Wx Photoinduced phase transition (PIPT) phenomena have received much attention in various types of solids such as organic charge transfer compounds, metal oxides, inorganic complexes, and even in metals [1][2][3][4]. In these materials, the strong electron-lattice or spin-lattice interactions have been shown to play a key role in driving the photoinduced transformation. Experimental evidence indicating that relatively weak photoexcitation can trigger a real macroscopic phase transition has been inferred in these systems from the huge photoconversion efficiencies as well as from the occurrence of characteristic nonlinear phenomena such as a threshold behavior. Here, we report on a conceptually different investigation where the phase transition was triggered by a spatially localized laser pulse within a comparatively large single crystal. Compared to previous studies on PIPT phenomena, our work brings in two new experimental features:(1) only a small part of the crystal is photoexcited by the focused laser beam, and (2) the phase change is not averaged for the whole crystal by a point or spectroscopic array detector but followed instead by an imaging charge-coupled device.For our experiments, we have chosen the molecular spin-crossover compound [Fe II ðbapbpyÞðNCSÞ 2 ] (1) (where bapbpy ¼ N-{6-[6-(pyridin-2-ylamino)pyridin-2-yl]pyridin-2-yl}pyridin-2-amine). Spin-crossover (SCO) materials of transition metal complexes are benchmark examples for PIPT. They exhibit bistability between the so-called low spin (LS) and high spin (HS) electronic configurations, which display strikingly different physical properties, including mass density, magnetic susceptibility, optical density, etc. [5]. Switching between the two molecular spin states can be induced by changing the sample temperature, applying external pressure or an intense magnetic field, and also by light irradiation. Light-induced excited spin state trapping in the solid state was first demonstrated by Decurtins et al. [6]. This so-called ''LIESST effect'' is basically a molecular phenomenon and can be observed only at cryogenic temperatures. On the other hand, several studies aimed a...

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“…This makes the initial-value problem associated with the mixed-type equation (1.2) ill-posed; in particular, it leads to the appearance of non-evolutionary or undercompressed discontinuities (kinks, phase boundaries, e.g. [22,23,38]). The parameters of these discontinuities satisfy both the classical Rankine-Hugoniot jump conditions…”

mentioning

confidence: 99%

Kinetics of Martensitic Phase Transitions: Lattice model

Truskinovsky¹,

Vainchtein²

2005

SIAM J. Appl. Math.

105

124

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Abstract. We obtain a closing kinetic relation for a mixed type hyperbolic-elliptic p-system originating in the theory of martensitic phase transitions by replacing continuum model with its natural discrete prototype. The procedure can be viewed as either regularization by discretization or as a physically motivated account of underlying discrete (atomic or mesoscopic) microstructure. Our fully inertial lattice model describes an isolated phase boundary and its novelty is in taking into account nonlocality in the form of general harmonic long-range interactions. Although the model is Hamiltonian at the microscale, it generates a nontrivial macroscopic jump relation between the velocity of the discontinuity and the conjugate configurational force. This relation characterizes the rate of (apparent) dissipation, respects entropy inequality but is supplementary to the usual RankineHugoniot jump conditions. The dissipation at the macrolevel is due to the induced radiation of lattice waves carrying energy away from the propagating front. We show that sufficiently strong nonlocality has a significant effect on the kinetic relation in both near-sonic and small-velocity regions.

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Thermal trapping and kinetics of martensitic phase boundaries

Cited by 40 publications

References 19 publications

Interface propagation and microstructure evolution in phase field models of stress-induced martensitic phase transformations

Interface propagation and microstructure evolution in phase field models of stress-induced martensitic phase transformations

Triggering a Phase Transition by a Spatially Localized Laser Pulse: Role of Strain

Kinetics of Martensitic Phase Transitions: Lattice model

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