In this work, the FCC --> HCP martensitic transformation was investigated d
uring isothermal aging at 850 degreesC in an as-cast Co-base alloy. It was
found that the transformation kinetics exhibited a sigmoidal behavior as ev
idenced by the determinations of epsilon -martensite vs. time, which in tur
n indicated a thermally activated nucleation process. (C) 2001 Acta Materia
lia Inc. Published by Elsevier Science Ltd. All rights reserved.