Indium solubility in iron studied with perturbed angular correlations

Segregation of In in Fe-based alloys containing 0.11-2.12 at.% In has been studied by measuring the perturbed angular correlations of gamma-rays emitt ed in the nuclear decay of In-111. The probe atoms were introduced into the alloys by either adding the carrier-free In-111 during melting or via ion implantation. Ageing of the samples at elevated temperatures followed by a slow cooling to room temperature allowed us to determine the upper limit of the solubility at room temperature, S(300 K) less than or equal to 30 at. ppm. This value is far below the one reported in the published phase diagra m. Quenching of the samples in water from 973-1373 K resulted in the determ ination of the indium solubility in iron at these elevated temperatures.