Crystallization and phase identification of Fe50Cr14Mo14C14B6X2 bulk amorphous steels by Mössbauer spectroscopy

Mössbauer spectroscopy has been used to study the crystallization behaviour in paramagnetic bulk amorphous steels Fe50Cr14Mo14C14B6X2 (X = Y and Dy), prepared by arc-melting and Cu mould casting techniques. Room temperature Mössbauer spectra of as-cast samples exhibit a broadened and asymmetric doublet-like structure that indicates the paramagnetic and amorphous nature of the as-cast alloys. During heat-treatment alloys crystallized into γ-Fe and η-Fe3Mo3C iron phases and crystallization completed at 1123 K. Alloy containing Dy shows better performance against crystallization at low temperature as compared to the Y-containing alloy.