The new theory of Ostwald ripening phenomena is gradually unfolding. Based on the principle of minimum rate of entropy production, the general method including the mathematical formalisms of variational calculus, is not understood and has been applied to the case of annealing of void structures, a situation somewhat simpler to model than is particle coarsening. The resultant void distribution function is compared with that expected from the LSW theory and with experiments. Developments in the experimental program in three areas are described: generation and annealing of voids in HVEM; distribution of Ni(sub 3) Al in Ni-Al alloys; and production of reproducible pore structures in nickel powder compacts.
Progress Rept., 1 Jul 78-30 Jun 79
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