# Low-temperature ordering in a substitutional alloy with injecting nonequilibrium vacancies: The FePt case Source: [Low-temperature ordering in a substitutional alloy with injecting nonequilibrium vacancies: The FePt case]() Collection index: [llms.txt]() Data updated: 2025-10-28T13:54:36.298Z Authors: N. I. Polushkin Published: 2022-08-24T18:03:18.000Z ## Abstract Achieving the compositionally ordered state in a substitutional alloy of two or more species can often be even critical for improving its functional properties. To produce a highly ordered alloy, a longtime high-temperature (up to T=1000 K) treatment of the alloy is typically necessary because of insufficient vacancy concentration (c\_v) and their mobility. However, such processing affects the morphology and complicates the technology of functional alloys. We show theoretically that the ordering in the practically important FePt system (Fe\_xPt\_1-x with x being close to 0.5) is already achievable at T=450 K for reasonable times t\<10^3 s due to frozen nonequilibrium vacancies. Our simulation is based on the Dienes equation for relaxation of the long-range order parameter (S), with taking additionally into account that the ordering kinetics in the alloy is mediated by vacancies. Importantly, the results of such simulation are in good agreement with previous experimental data on the ordering kinetics. We also find that nanosecond laser pulses can be employed to achieve a sufficient level of c\_v=10^-5 for effective low-temperature ordering. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()