Abstract
The coarsening behavior of Ni–Al solid–solution precipitates in an Ni3Al matrix was investigated in alloys containing 22.0–22.8at.% Al aged at 650–800°C for times exceeding 1800h. The rate constant for coarsening increases with equilibrium volume fraction as predicted by the MLSW theory. The activation energy for coarsening, 314.1±16.6kJmol−1, agrees very well with results from conventional diffusion experiments. The particle size distributions are not in very good agreement with the predictions of any theory; possible reasons are discussed. The particles become more spherical with decreasing elastic self-energy. The results are consistent with the premise that a strong volume fraction effect is observed so long as diffusion in the matrix phase, and not through the precipitate–matrix interface, controls the kinetics.
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