| Estimation of the Effect of Grain Boundary Diffusion on Microstructure Development in Magnetite Bi-crystal under Oxygen Chemical Potential Gradient at 823 K |
| Mitsutoshi Ueda, Toshio Maruyama |
| Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology |
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| ABSTRACT |
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Mass transport near grain boundary in a magnetite bi-crystal has been estimated at 823 K by finite element method. Mass transport near grain boundary strongly depends on the diffusivities along grain boundary. If grain boundary diffusion has the same oxygen activity dependence as lattice diffusion, there is no mass transport between grains and grain boundary. On the other hand, mass transport between grains and grain boundary is observed in the case that grain boundary diffusion has different oxygen activity dependence. |
| Key words:
Microstructure development, Grain boundary diffusion, Mass transport, Chemical potential distribution, Divergence of the ionic flux |
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