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- W4300108811 abstract "Grain boundary (GB) migration exhibits intriguing anti-thermal behavior (or non-Arrhenius behavior), with the temperature and driving force playing crucial roles. Through atomistic simulations on nickel bicrystals, we investigate the change in GB mobility with variations in both temperature and driving force. Our results reveal that the GB mobility initially increases with temperature and subsequently decreases after reaching the transition temperature (Ttrans), and, notably, Ttrans exhibits a linear relationship with the activation energy (Q) associated with GB migration. By modulating the driving force, we found that the driving force could effectively lower Q, resulting in the shift of Ttrans towards lower temperatures. Additionally, higher driving forces were found to activate more migration modes at lower temperatures, potentially leading to a transition in the thermal behavior of GB migration. Our work supports the existing theoretical models for GB migration based on both classical thermal activation and disconnection nucleation. Furthermore, we refined the existing model by incorporating the influence of the driving force. The modified model can not only describe the effect of driving force on the thermal behavior of GB migration but also accounts for the observed anti-driving force phenomenon in GB migration. Our research has the potential to offer valuable insights for investigating realistic GB migration under more intricate constraints and environments." @default.
- W4300108811 created "2022-10-03" @default.
- W4300108811 creator A5035135715 @default.
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- W4300108811 date "2022-08-17" @default.
- W4300108811 modified "2023-09-30" @default.
- W4300108811 title "Driving force induced transition in thermal behavior of grain boundary migration in Ni" @default.
- W4300108811 doi "https://doi.org/10.48550/arxiv.2208.08069" @default.
- W4300108811 hasPublicationYear "2022" @default.
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