Abstract
The ordering efficiency of mobile interstitials in Ni3Al during long-range diffusion is investigated using a rate equation approach for the defect evolution. It is shown that experimentally observed disordering kinetics under electron irradiation below room temperature can be well explained by interstitial migration. It is proposed that the elementary ordering jump consists of an exchange of neighbouring Ni and Al antisites induced by the presence of a NiNi dumbbell interstitial. However, in ion-irradiated Ni3Al such ordering process is not efficient enough to produce the observed long-range order. Under these irradiation conditions a more effective re-ordering mechanism than interstitial-induced ordering, e.g. thermal spike ordering must be operative.
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