Abstract
To clarify the reason for the change in effective permeability with increasing boron content before and after crystallization, we investigated the microstructure of Fe 93− x Zr 7B x ( x = 2, 4, 6, 8) alloys annealed for 1 h in the temperature range 350–600 °C, using transmission electron microscope. In low boron alloys ( x = 2, 4), the amorphous phase showed indications of a typical interconnected pattern, exhibiting a spinodal-type decomposition. After crystallization, it changed to a mainly single b.c.c. structure with a homogeneous grain size distribution of about 20 nm, and the effective permeability had a high value of around 19000. In high boron alloys ( x = 6, 8), the microstructure after crystallization showed an inhomogeneous grain size distribution, and a low effective permeability. These results may be the result of the different phase separation pattern in the amorphous state.
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