Abstract
A calculation of the growth of shape instabilities is presented for a rod composite microstructure. It is assumed that migration of the interface is driven by capillarity and controlled by diffusive transport in the matrix. If the interface is faceted or if the rod fraction exceeds 20 per cent, a two dimensional coarsening mode occurs more rapidly than spheroidization of the rods. The time for a significant number of rods to dissolve by two dimensional growth is found to depend on the initial distribution of rod sizes. If faults are present coarsening may also occur by fault migration. In the case of faults coarsening occurs most rapidly at the beginning and then slows down because of the increased rod size and because of fault annihilation. The effects of interface kinetics, surface energy anisotropy and stress on the coarsening of composite structures are discussed.
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