| Abstract: | We have used diffuse scattering of x-rays (DSX) and a model potential to show short-range order exists in iron-rhodium alloys. After the alloy Fe-25 at. % Rh was quenched following annealing at 900°C for 1 h, a clearly visible diffuse maximum (characteristic of short-range order) appeared in the diffraction pattern, in addition to reflections from the α- and γ-phases. For the single-phase, dilute solid solution Fe-2.5 at. % Rh, starting with the effects of static displacements, we have calculated the short-range order parameters (α1 = −0.02, α2 = −0.09, α3 = 0.02, α4 = 0.05). The elastic constants of Fe-2.5 at. % Rh needed to compute the short-range order parameters from the DSX data were calculated using a model potential. Theoretical calculations of the order energy and the short-range order parameters, performed using a model potential for these alloys, agree with the experimental data. M. V. Lomonosov Moscow State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 71–77, March, 1998. |
