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■ Abstract Obtaining a good atomistic description of diffusion dynamics in materials has been a daunting task owing to the time-scale limitations of the molecular dynamics method. We discuss promising new methods, derived from transition state theory, for accelerating molecular dynamics simulations of these infrequent-event processes. These methods,… (More)

- Arthur F. Voter
- 1997

For infrequent-event systems, transition state theory ~TST! is a powerful approach for overcoming the time scale limitations of the molecular dynamics ~MD! simulation method, provided one knows the locations of the potential-energy basins ~states! and the TST dividing surfaces ~or the saddle points! between them. Often, however, the states to which the… (More)

Because of its unrivaled predictive power, the molecular dynamics (MD) method is widely used in theoretical chemistry, physics, biology, materials science, and engineering. However, due to computational cost, MD simulations can only be used to directly simulate dynamical processes over limited timescales (e.g., nanoseconds or at most a few microseconds),… (More)

- Xian-Ming Bai, Arthur F Voter, Richard G Hoagland, Michael Nastasi, Blas P Uberuaga
- Science
- 2010

Although grain boundaries can serve as effective sinks for radiation-induced defects such as interstitials and vacancies, the atomistic mechanisms leading to this enhanced tolerance are still not well understood. With the use of three atomistic simulation methods, we investigated defect-grain boundary interaction mechanisms in copper from picosecond to… (More)

- Valery Borovikov, Xian-Zhu Tang, Danny Perez, Xian-Ming Bai, Blas P Uberuaga, Arthur F Voter
- Journal of physics. Condensed matter : an…
- 2013

Atomistic computer simulations were performed to study the influence of radiation-induced damage on grain boundary (GB) sliding processes in bcc tungsten (W), the divertor material in the ITER tokamak and the leading candidate for the first wall material in future fusion reactors. In particular, we calculated the average sliding-friction force as a function… (More)

- Daniel J Sindhikara, Seonah Kim, Arthur F Voter, Adrian E Roitberg
- Journal of chemical theory and computation
- 2009

Molecular dynamics simulations starting from different initial conditions are commonly used to mimic the behavior of an experimental ensemble. We show in this article that when a Langevin thermostat is used to maintain constant temperature during such simulations, extreme care must be taken when choosing the random number seeds to prevent statistical… (More)

- Blas P Uberuaga, Marian Anghel, Arthur F Voter
- The Journal of chemical physics
- 2004

For two methods commonly used to achieve canonical-ensemble sampling in a molecular-dynamics simulation, the Langevin thermostat and the Andersen [H. C. Andersen, J. Chem. Phys. 72, 2384 (1980)] thermostat, we observe, as have others, synchronization of initially independent trajectories in the same potential basin when the same random number sequence is… (More)

- B P Uberuaga, R G Hoagland, A F Voter, S M Valone
- Physical review letters
- 2007

Defect accumulation is the principal factor leading to the swelling and embrittlement of materials during irradiation. It is commonly assumed that, once defect clusters nucleate, their structure remains essentially constant while they grow in size. Here, we describe a new mechanism, discovered during accelerated molecular dynamics simulations of vacancy… (More)

- Luis Sandoval, Danny Perez, Blas P Uberuaga, Arthur F Voter
- Physical review letters
- 2015

The growth process of He bubbles in W is investigated using molecular dynamics and parallel replica dynamics for growth rates spanning 6 orders of magnitude. Fast and slow growth regimes are defined relative to typical diffusion hopping times of W interstitials around the He bubble. Slow growth rates allow the diffusion of interstitials around the bubble,… (More)

- Danny Perez, Sheng-Nian Luo, Arthur F Voter, Timothy C Germann
- Physical review letters
- 2013

While preexisting defects are known to act as nucleation sites for plastic deformation in shocked materials, the kinetics of the early stages of plastic yield are still poorly understood. We use atomistic simulation techniques to investigate the kinetics of plastic yield around small preexisting voids in copper single crystals under uniaxial tensile strain.… (More)