The coarsening behavior of Ni–Al solid–solution precipitates in an Ni 3 Al 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...
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