摘要
A cellular automata (CA) method was employed to model static coarsening controlled by diffusion along grain boundaries at 1173K and through the bulk at 1213 and 1243K for a two-phase titanium alloy. In the CA model, the coarsening rate was inversely proportional to the 3rd power of the average grain radius for coarsening controlled by diffusion along grain boundaries, and inversely proportional to the 2nd power of the average grain radius for coarsening controlled by diffusion through the bulk. The CA model was used to predict the morphological evolution, average grain size, topological characteristics, and the coarsening kinetics of the Ti-6Al-2Zr-1Mo-1V (TA15) alloy during static coarsening. The predicted results were found to be in good agreement with the corresponding experimental results. In addition, the effects of the volume fraction of the phase (Vf ) and the initial grain size on the coarsening were discussed. It was found that the predicted coarsening kinetic constant increased with Vf and that a larger initial grain size led to slower coarsening.
A cellular automata （CA） method was employed to model static coarsening controlled by diffusion along grain boundaries at 1173 K and through the bulk at 1213 and 1243 K for a two-phase titanium alloy. In the CA model, the coarsening rate was inversely proportional to the 3rd power of the average grain radius for coarsening controlled by diffusion along grain boundaries, and in- versely proportional to the 2nd power of the average grain radius for coarsening controlled by diffusion through the bulk. The CA model was used to predict the morphological evolution, average grain size, topological characteristics, and the coarsening kinetics of the Ti-6A1-2Zr-IMo-IV （TA15） alloy during static coarsening. The predicted results were found to be in good agreement with the corresponding experimental results. In addition, the effects of the volume fraction of the α phase （Vf） and the initial grain size on the coarsening were discussed. It was found that the predicted coarsening kinetic constant increased with Vf and that a larger initial grain size led to slower coarsening.
基金
supported by the National Natural Science Foundation of China (50935007, 51175428)
the National Basic Research Program of China (2010CB731701)
the Foundation for Fundamental Research of Northwestern Polytechnical University in China (NPU-FFR-JC20100229)
the Center for Foreign Talent Introduction and Academic Exchange for Advanced Materials and Forming Technology Discipline Project (B08040)
