Abstract
Abstract
Samples of the intermetallic compound NiAl have been quenched from 800–1400°C and their recovery behaviour studied by positron annihilation techniques. Two distinct recovery stages were found by Doppler broadening measurements; one at around 280°C and the other at around 500°C. It is shown that vacancies anneal out at the latter stage. The former stage is ascribed to the migration of divacancies to form voids.