Thermal Evolution of Fe65Ni20Nb6B9 Nanocrystalline Metastable Alloy

MENDOZA ZÉLIS, P.; RODRÍGUEZ TORRES, C.E.; CABRERA, A.F.; FERNÁNDEZ VAN RAAP, M.B.; PASQUEVICH, G.A.; SÁNCHEZ, FRANCISCO H.; GONZÁLEZ, A.; SUÑOL, JOAN JOSEP

Journal of Metastable and Nanocrystalline Materials

SCIENTIFIC NET

Año: 2003 vol. 20 p. 571 - 575

The alloy Fe65Ni20Nb6B9 was obtained from the elemental constituents in a high-energy planetary ball mill and was studied by 57Fe Mössbauer effect spectroscopy, Mössbauer thermal scans and X-ray diffraction. The as prepared nanocrystalline alloy consisted primarily of metastable bcc α-Fe(Ni) nanocrystals (57 nm average size) and small amounts of γ-(Fe,Ni) with Ni concentration of about 58%. Up to about 693 K only defect recovery is inferred. Between 693 and 873 K the α-phase transformed gradually into the fee γ-phase, whose starting Ni concentration decreased continuously with increasing temperature, reaching a final value which was below 32 at. %.