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Reasonable evaluation of composition amplitude in spinodal decomposition is achallenge to microanalysis of atom probe tomography, especially at early stageswhen phase separation is not prominent. This impedes quantitative analysis ofspinodal structure in atom probe tomography as well as comparison withsimulated results from phase field simulations. We hereby report an effectivemethod to estimate the composition amplitude by constructing an amplitudedensity spectrum. This method can sensitively determine the compositionamplitude at early stages. In particular, it substantially bridges experimentaland simulation techniques comprising both discrete and continuum data in thestudy of spinodal decomposition. Moreover, it was found that the commonlyadopted Langer-Bar-on-Miller method for atom probe analysis underestimates thecomposition amplitude of spinodal decomposition. Case studies have beenperformed on the Fe-Cr binary alloys.

An Effective Method to Estimate Composition Amplitude of Spinodal Decomposition for Atom Probe Tomography Validated by Phase Field Simulations