Representative trajectories of a single SIA in a-iron, collected for all of the 1 ns simulations, are shown in รูป1. At 500 K
(รูป. 1a), it can be seen that SIA diffusion barely occurred during the 1 nm simulation using the conventional MD model, while a fully three-dimensional (3D) trajectory that consists of relatively long one-dimensional random walk segments with abrupt reorientations was obtained using the hyper-MD method. By applying the hyper-MD method, the SIA diffusion was extremely accelerated, and the corresponding physical time reached up to 2.2 *102 ns. As the temperature was increased to 700 K (รูป. 2b), using a conventional MD model, the trajectory of the diffusion could be traced during the 1 ns simulation, but the diffusion was very limited to a narrow region. On the other hand, using the hyper-MD method, a significant acceleration of the diffusion was realized, and a full 3D trajectory similar to that observed at 500 K was obtained.
Representative trajectories of a single SIA in a-iron, collected for all of the 1 ns simulations, are shown in รูป1. At 500 K(รูป. 1a), it can be seen that SIA diffusion barely occurred during the 1 nm simulation using the conventional MD model, while a fully three-dimensional (3D) trajectory that consists of relatively long one-dimensional random walk segments with abrupt reorientations was obtained using the hyper-MD method. By applying the hyper-MD method, the SIA diffusion was extremely accelerated, and the corresponding physical time reached up to 2.2 *102 ns. As the temperature was increased to 700 K (รูป. 2b), using a conventional MD model, the trajectory of the diffusion could be traced during the 1 ns simulation, but the diffusion was very limited to a narrow region. On the other hand, using the hyper-MD method, a significant acceleration of the diffusion was realized, and a full 3D trajectory similar to that observed at 500 K was obtained.
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