A Mossbauer Study of Crystallisation in Amorphous Fe sub x Ni sub 80--x B sub 20 (20 < = x < = 60)

Crystallisation of the amorphous alloy system Fe sub x Ni sub 80--x B sub 20 (x = 20, 25, 40, 60) is studied by vacuum annealing samples between room temperature and 1073K for up to 72 h. Analysis of the Mossbauer spectra along with supporting X-ray diffraction measurements is presented. The structure of the crystallization products of these amorphous alloys proceeds from (i) bcc-(Fe, Ni), t-(Fe, Ni) sub 3 B and fcc-(Fe, Ni), t-(Fe, Ni) sub 2 B for high Fe content through (ii) fcc-(Fe, Ni) and o-(Fe, Ni) sub 3 B for equal contents of Fe and Ni to (iii) fcc-Ni sub 3 FeB for low Fe content.