Estimation of the solubility limit of Cr in Fe at 300 °C from small-angle neutron scattering in neutron-irradiated Fe–Cr alloys

The solubility limit of Cr in Fe (α-Fe–Cr) at low temperatures is a matter of debate. We report a direct estimation of the solubility limit at 300 °C from small-angle neutron scattering (SANS) data obtained for neutron-irradiated Fe–Cr alloys. The SANS results indicate that the equilibrium concentration of α′ was reached via irradiation-enhanced diffusion. The solubility limit was estimated using an iterative approach based on the SANS invariant and the lever rule of phase equilibrium.