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Grain growth as a stochastic and curvature-driven process |
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| Authors: | Y. G. Zheng Y.-W. Mai H. W. Zhang Z. Chen |
| Affiliation: | 1. State Key Laboratory of Structure Analysis for Industrial Equipment, Department of Engineering Mechanics , Dalian University of Technology , Dalian, 116024, P. R. China;2. Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering J07, The University of Sydney , Sydney, NSW 2006, Australia;3. Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering J07, The University of Sydney , Sydney, NSW 2006, Australia;4. State Key Laboratory of Structure Analysis for Industrial Equipment, Department of Engineering Mechanics , Dalian University of Technology , Dalian, 116024, P. R. China;5. Department of Civil and Environmental Engineering , University of Missouri-Columbia, Columbia , Missouri 65211-2200, USA |
| Abstract: | Grain growth subjected to the interplay of stochastic and curvature-driven mechanisms in a single-phase system has been investigated. Numerical results have shown that when the grains are smaller than several tens of nanometres the dominating mechanism is stochastic diffusion control of boundaries. As the grains grow the influence of the deterministic curvature-driven mechanism increases and finally controls the process. In terms of finite-difference solutions to the Fokker–Planck continuity equation, the predicted grain size approaches a log-normal distribution, which agrees well with experimental observations. |
| Keywords: | nickel alloys laser treatment welding microstructure change Ni-based superalloys |