Mössbauer Spectroscopy, Dilatometry and Neutron Diffraction Detection of the ɛ-Phase Fraction in Fe–Mn Shape Memory Alloys

MARTINEZ, J.; AURELIO, G.; CUELLO, G. J.; COTES, S. M.; A. FERNÁNDEZ GUILLERMET; DESIMONI, J.

Mexico

Conferencia; LACAME 2004; 2004

The results of a Mossbauer spectroscopy (MS) and a neutron diffraction (ND) studycarried out on a set of Fe–Mn alloys quenched from high temperatures are reported. Uponquenching the high temperature stable phase FCC () together with metastably retained HCP-(") phase are formed. The lattice parameters obtained using ND are in excellent agreement withprevious results of the literature. The phase fractions obtained from MS are coincident, withinexperimental errors, with those extracted from ND, with exception of the case of an alloy with the lowest Mn content (16.8 at.% Mn). That situation can be associated with the occurrence of a high density of stacking faults (SF) in the phase or to the presence of a paramagnetic phase. " phase fractions obtained from MS and ND decrease smoothly with Mn content but are always larger than the values reported in literature resulting from dilatometry.