Phase-decomposition-related short-range ordering in a Fe-Cr alloy

Abstract

A redistribution of Cr atoms related to a phase decomposition (PD) caused by an isothermal annealing at 415 C in a 15.15 at%Cr Fe-Cr alloy was studied in an ex-situ way by the conversion electrons Mössbauer spectroscopy. Analysis of the spectra in terms of a two-shell model enabled determination of probabilities of 17 different atomic configurations and average numbers of Cr atoms within the first (1NN) and the second (2NN) neighbor shells versus annealing time, separately. The annealing-time evolution of these numbers, expressed in terms of the Cowley-Warren short-range order (SRO) parameters, was shown to follow the Johnson-Mehl-Avrami-Kolgomorov equation. The SRO-parameter averaged over the 1NN-2NN shells was revealed to be linearly correlated with the average hyperfine field. Signatures in favor of the nucleation and growth mechanisms responsible for PD are discussed, too.

12 pages, 8 figures, 3 tables, 29 references

References in corpus (5)

• Simple concentration-dependent pair interaction model for large-scale simulations of Fe-Cr alloys
• A new neutron study of the short range order inversion in Fe${}_{1-x}$Cr${}_x$
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Cited by in corpus (7)

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• Distribution of Cr atoms in a strained and strain-relaxed Fe89.15Cr10.75 alloy: Mössbauer effect study
• Phase decomposition in an Fe-Cr alloy at 402 deg C: Mössbauer spectroscopic study
• Effect of quenching medium on short-range order in Fe-rich Fe-Cr alloys
• Effect of 0.25 and 2.0 MeV He-ion irradiation on short-range ordering in model (EFDA) Fe-Cr alloys
• What can one learn about Fe-Cr alloys using Mössbauer spectroscopy?
• Structural-disorder and its effect on the mechanical properties in single-phase TaNbHfZr high-entropy alloys