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Abstract
Abstract Radiation damage and the recovery of neutron-irradiated γ-TiAl (Ti 44 Al 56 ) have been studied using positron annihilation lifetime spectrometry. The recovering process of the neutron-irradiated TiAl can be divided into two stages. The first stage, below 660 K, is ascribed to the migration of point defects and the second stage, above 660 K, is due to the dissolution of secondary defects formed at the former stage. The major defect induced by reactor neutron-irradiation is collapsed planar aggregates of point defects. Although some non-collapsed vacancy clusters are also induced, they consist of only a few vacancies each, seldom grow into larger voids during the subsequent annealing, and almost disappear below 700 K. Neutron-irradiated Ti 44 Al 56 recovers to the fully annealed state below 960 K. γ-TiAl has good tolerance for radiation.
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