Thermal Behavior and Crystallization of Fe81−xCoxZr7Nb2B10 (x = 2, 4, 6) Alloys

Thermal behavior and microstructure of Fe81−xCoxZr7Nb2B10 (x = 2, 4, 6) alloys were investigated by differential thermal analysis and X-ray diffraction. Both the supercooled liguid region ∆Tx and the first crystallization peak temperature Tp1 are the lowest and the span ∆Tp between Tp1 and Tp2 is the highest when 4 at. % Fe is substituted by Co. The crystallization activation energy Ep1 for Fe75Co6Zr7Nb2B10 alloy is the minimum for the heating rates ν = 5–20 K/min. Ep1 for Fe77Co4Zr7Nb2B10 alloy is the minimum for the heating rates ν = 20–50 K/min. The crystallization processes of Fe81−xCoxZr7Nb2B10 (x = 2, 4, 6) amorphous alloys are similar on the whole, which is as follows: amorphous → amorphous + α-Fe(Co) → α-Fe(Co) + Fe3Zr + Fe2Nb0.4Zr0.6. PACS: 65.60.+a, 61.43.D