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On grain and subgrain rotations in two dimensions

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Abstract

Computer simulations of subgrain growth by coalescence in two dimensions have been carried out. The model governing the dynamics allows the subgrains to rotate in order to reduce the sub-boundary energies. The purpose of the model is to study this mechanism separately; thus, the sub-boundaries are not allowed to migrate out of their initial positions. Hence, a coarsening of the subgrain structure occurs due to coalescence only. Results from several simulations are discussed. It was found that the mean subgrain size increased as an exponential function of time. The effect of the initial distribution of orientations and angles of misorientation has also been studied. It was found that the width of the distribution of orientations is important for the evolution of the mean subgrain size. The model and, consequently, the simulations concern subgrain rotations leading to coalescence. Based on these results, the general case of grain rotations in two dimensions has been discussed. It has been suggested that grain rotations depend on the grain boundary energy as a function of the misorientation.

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Authors and Affiliations

  1. Department of Material Science and Engineering, Agder College, N-4890, Grimstad, Norway

    T. O. Saetre

  2. Department of Metallurgy, the Norwegian Institute of Technology, 7034, Trondheim, Norway

    N. Ryum

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  1. T. O. Saetre
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  2. N. Ryum
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Formerly with the Hydro Aluminum a.s. R&D Center, Karmöy, Norway

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Saetre, T.O., Ryum, N. On grain and subgrain rotations in two dimensions. Metall Mater Trans A 26, 1687–1697 (1995). https://doi.org/10.1007/BF02670755

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  • DOI: https://doi.org/10.1007/BF02670755

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