FINEMET Alloy

Alloy name: FINEMET
Diagram No.: 645
Type of diagram: TTT
Chemical composition in atomic %: 73.5% Fe, 16.5% Si, 6.00% B, 3.00% Nb, 1.00% Cu
Alloy group: Iron-based alloys
Note: TTT diagram for FINEMET of composition Fe73.5Si16.5B6Nb3Cu1 (Adapted from Willard and Daniil, with permission from Elsevier).
From Figure , we note that it is possible to crystallize only Fe3Si for temperatures between 773 K (500C ) and 833 K (560C) for holding times between 1.0 and 1.5 h. Additionally, we note that Fe3Si nanocrystals can be crystallized by annealing for about 200 s holding time at temperatures between about 833 K (560C) and 1000 K (727C). But isothermal annealing at this temperature for 1 h holding time leads to precipitation of intermetallic Fe-B phases that need to be avoided as they are detrimental for soft magnetic properties. To ensure that no detrimental intermetallic Fe-B phase will be precipitated, in this work we focused on performing isothermal annealing at 490C, 500C, 510C, 520C, 530C, 540C and 550C for 2 h holding time.
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