Mössbauer and XRD study of Al-Sn linished steel bimetal alloy

Aluminium alloy free CS1 type steel (0.06 wt% C, 0.45 wt% Mn) and samples of cold roll bonded steel bimetal alloys (MAS15 and MAS16) were fabricated and investigated by X-ray diffraction (XRD),57Fe conversion electron Mossbauer spectroscopy (CEMS) at room temperature. XRD has revealed only the existence of the alpha iron solid solution(steel) phase in the steel only sample, while identified steel and metallic Al and Sn con-stituent phases in the bimetallic alloys. 57Fe Mossbauer spectroscopy revealed the presence of 4 % secondary iron-bearing phase attributed mainly to iron oxide/ oxyhydroxides (ferri-hydrite) besides the steel matrix on the surface of the steel sample. A significant difference between the occurrences of the secondary phase of differently prepared bimetal alloys found in their 57Fe CEM spectra allowed to identify the main phase of debris as different iron oxide/ oxyhydroxides