Effects of phonons on mobility of dislocations and dislocation arrays

Chen, Xiang; Xiong, Liming; McDowell, David L.; Chen, Youping

doi:10.1016/j.scriptamat.2017.04.033

Cited by 51 publications

(30 citation statements)

References 31 publications

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“…show that a dislocation can travel to microns before its velocity reaches a steady state condition 75 ; this explains the size-effect in MD [77][78] .…”

Section: Phonons Scattering By Moving Dislocationsmentioning

confidence: 90%

“…A verification study of the CAC method in modeling fast moving dislocations has been reported 74 . One of our recent works has presented a phonon pulse propagation in crystalline materials with a fast moving dislocation and dislocation array while studying the effect of phonons on dislocation mobility 75 . Figure 8 presents the kinetic energy distributions at the vicinity of the dislocation cores during the process of nucleation and migration of a single dislocation ( Fig.…”

Section: Phonons Scattering By Moving Dislocationsmentioning

confidence: 99%

“…9(a). This in turn, changes the mobility of the dislocation when it is in the array compared to when it is present alone 75 . Figure 9(b) shows that during the interaction, one of the dislocations starts to decelerate by emitting phonon waves from the dislocation core and is soon arrested.…”

Section: Fig 8 Time Sequences Of the Kinetic Energy Distributions Atmentioning

confidence: 99%

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Recent progress in the concurrent atomistic-continuum method and its application in phonon transport

Chen

Díaz

et al. 2017

MRS Communications

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This work presents recent the progress in the development of the Concurrent Atomistic-Continuum (CAC) method for coarse-grained space-and time-resolved atomistic simulations of phonon transport. Application examples, including heat pulses propagating across grain boundaries and phase interfaces, as well as the interactions between phonons and moving dislocations, are provided to demonstrate the capabilities of CAC. The simulation results provide visual evidence and reveal the underlying physics of a variety of phenomena including: phonon focusing, wave interference, dislocation drag, interfacial Kapitza resistance caused by quasi-ballistic phonon transport, etc. A new method to quantify fluxes in transient transport processes is also introduced.

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“…show that a dislocation can travel to microns before its velocity reaches a steady state condition 75 ; this explains the size-effect in MD [77][78] .…”

Section: Phonons Scattering By Moving Dislocationsmentioning

confidence: 90%

Section: Phonons Scattering By Moving Dislocationsmentioning

confidence: 99%

See 1 more Smart Citation

Recent progress in the concurrent atomistic-continuum method and its application in phonon transport

Chen

Díaz

et al. 2017

MRS Communications

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“…Also, with the interatomic potential being the only constitutive law, CAC does not require any other priori assumptions regarding phonon transport. In existing works, CAC has been demonstrated reliable in modeling and simulating dislocations, 29,40,[52][53][54][55][56][57][58][59][60][61] reproducing phonon dispersion relations 62 and simulating transient phonon transport and interaction with defects including dislocations. 54,63 COMPUTER MODEL AND SIMULATION SETUP…”

Section: Cac Methodologymentioning

confidence: 99%

“…Based on theoretical foundations by Chen, [23][24][25][26] CAC is pioneered by Xiong 27 and further developed by Deng, 28 Yang 29 and Xu; 30,31 the methodology has been demonstrated effective in simulating material systems from the nano-to mesoscales. [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] Similar to MD, CAC does not require assumptions or empirical laws regarding phonon properties; it is therefore predictive in simulating phonon transport at the micron scale.…”

Section: Introductionmentioning

confidence: 99%

Phonon Transport Across Coherent and Incoherent Interfaces

Chen

Yang

2019

JOM

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Phonon-mediated heat transport in two-dimensional superlattices with coherent and incoherent interfaces is simulated by using the concurrent atomistic-continuum method. The energy transmission across superlattices with incoherent interfaces is found to be an order of magnitude lower than that with coherent interfaces. The simulation results provide a direct visualization of the transient processes of phonon propagation and scatterings, which facilitates an improved mechanistic understanding of phonon transport across multiple interfaces. This work finds that heat conduction in superlattices with coherent interfaces is dominated by coherent phonons, while the existence of defects that comprise the incoherent interfaces destroys the wave interference and changes the phonon transport nature from coherent to diffusive. In addition, phonon scattering by interface defects becomes stronger with decreasing phonon wavelength, and the phonon coherence is destroyed for phonons with 5 nm wavelength.

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Generalized Continua Concepts in Coarse-Graining Atomistic Simulations

Xiong

et al. 2018

Advanced Structured Materials

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Effects of phonons on mobility of dislocations and dislocation arrays

Cited by 51 publications

References 31 publications

Recent progress in the concurrent atomistic-continuum method and its application in phonon transport

Recent progress in the concurrent atomistic-continuum method and its application in phonon transport

Phonon Transport Across Coherent and Incoherent Interfaces

Generalized Continua Concepts in Coarse-Graining Atomistic Simulations

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