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Coarsening kinetics of the equilibrium phase in the Al- rich end of the Al- Ti- Cu and Al- Ti- Ni systems have been studied using transmission electron microscopy as a function of annealing times at 698 K. The equilibrium phase in the Al- Ti- Ni system coarsens at a rate that is 6 times faster than that in the Al- Ti- Ni phase. This difference in the coarsening kinetics is related to the amount of mismatch of each of the equilibrium phases with respect to the Al- matrix...