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Abstract
With decreasing grain size, grain boundary junctions become increasingly important for microstructure evolution. We show that the effect of a limited mobility of triple junctions on the growth rate of polycrystals can be implemented in theories of three-dimensional (3D) grain growth. Respective analytical relations are derived on the basis of the average n-hedra approach introduced by Glicksman to describe the volume rate of change of 3D grains in a polycrystalline aggregate under the impact of a limited triple junction mobility. The theoretical predictions were compared to network-model computer simulations, and good agreement was obtained.
Acknowledgements
Financial assistance from the collaborative research centre of the Deutsche Forschungsgemeinschaft (DFG) SFB 761 “Stahl ab-initio” and through project Go335 of the DFG is gratefully acknowledged. We appreciate the financial support of the cooperation through the DFG Grant RUS113/846/0-2(R) and the Russian Foundation of Fundamental Research (Grant DFG-RRFI 09-02-91339). Discussions with Prof. P.R. Rios during his stay at the IMM are gratefully acknowledged.