Mössbauer investigation of the effect ef electrochemical polishing on FeMn alloys

M.A. DAPINO, S.M. COTES, A.F. CABRERA, R.C. MERCADER AND J. DESIMONI

HYPERFINE INTERACTIONS

SPRINGER

Año: 2003 vol. 148 p. 331 - 3369

0304-3843

In this work we explore electrochemical-polishing for thinning Fe-Mn samples. We set out by studying with CEMS and XCMS a sample approximately 1 mm thick of a bcc Fe-13.7 wt. % Mn alloy, and subjected it to electrochemical etching in a solution of 10% perchloric acid and 90% acetic acid solution. Afterwards, the sample was electrochemically thinned to reach the suitable thickness to perform transmission Mössbauer spectroscopy. This technique is sensitive to the different Fe-Mn configurations of the bcc-Fe(Mn) substitutional solid solution whose relative populations depend on the Mn concentration. After analysing the spectra, and considering a random distribution approximation model, we discuss the conditions in which electrochemical polishing can be used as a confident method for thinning this type of samples.