Thermal evolution of Fe65Ni20Nb6B9 nanocrystalline metastable alloy

P. MENDOZA ZÉLIS, C. RODRIGUEZ TORRES, A.F. CABRERA, M. FERNÁNDEZ VAN RAAP, G.A. PASQUEVICH, F.H. SÁNCHEZ, A. GONZÁLEZ AND J.J. SUNYOL

JOURNAL OF METASTABLE AND NANOCRYSTALLINE MATERIALS

Trans Tech Publications

Año: 2004 vol. 20 p. 571 - 575

1422-6375

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 thermalscans and X-ray diffraction. The as prepared nanocrystalline alloy consisted primarily of metastable bcc a-Fe(Ni) nanocrystals (57 nm average size) and small amounts of g-(Fe,Ni) with Ni concentration of about 58%. Up to about 693 K only defect recovery is inferred. Between 693 and  873 K the a-phase transformed gradually into the fcc g-phase, whose starting Ni concentration decreased continuously with increasing temperature, reaching a final value which was below 32 at.%.