Abstract
Abstract The perturbed γ-ray angular correlation (PAC) technique with radioactive tracers is a novel method of investigating early stages of ion beam induced phase transformations, visible as changes in the hyperfine interaction parameters of the probe nuclei. In this study NiAl multilayers of different composition ratios doped with implanted 111 In ions were irradiated with 900 keV Xe 2+ ions and analysed by means of PAC. Room temperature bombardment of samples with the ratio 1:3 or 3:1 produced amorphous or highly disordered phases, while the 3:2 phase was observed to become partly amorphous. Amorphisation was also found for LN irradiation of NiAl in the ratio 1:1, contrary to the formation of the crystalline NiAl phase at RT. These results are discussed in the light of the NiAl bilayer mixing rates and current ion mixing models.
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