Abstract
The morphology of discontinuous precipitation of the δ′ phase is investigated in very high Li concentration AlLiZr alloys using transmission electron microscopy. Contrary to previous observations, the reaction was found to initiate during quenching following solution heat treatment. Furthermore, the reaction was found to be very sensitive to the cooling rate from the solution treatment temperature since this could change the solute distribution in the vicinity of a grain boundary. It is demonstrated that the initiation of discontinuous precipitation in AlLi alloys can not be explained in terms of recrystallisation pressures and that the grain boundaries are repelled by developing discontinuous δ′ colonies leading to gross distortion of the grain boundaries. The reaction mechanisms involved, and existing and new models for the discontinuous precipitation of δ′, are discussed in the light of these observations.
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