Abstract

Extended X-ray absorption fine-structure (EXAFS) and X-ray absorption near-edge spectroscopy (XANES) have been used to study the local order in Fe x Al 1− x alloys ( x = 0.5, 0.53, 0.60 and 0.62). Using the same technique, we also analyze the chemical disorder variations induced in Fe 60Al 40 samples irradiated with N + ions at damage rates of the order of 0.1, 0.2 and 0.9 dpa. The EXAFS results related to Fe x Al 1− x samples reveal that all alloys are chemically ordered. In what concerns the implanted Fe 60Al 40 samples, an EXAFS analysis of the experimental data confirms unambiguously that irradiation creates an ion beam induced chemical disorder in the material. For the damage rate of 0.1 dpa, it corresponds to a chemical disorder of about 34%. All these results are correlated with the evolution of the XANES fine structures that were analyzed theoretically with more details for the equiatomic composition.

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