Unique influence of heating rate on the magnetic softness of Fe_(81.5)Si_(0.5)B_(4.5)P_(11)Cu_(0.5)C_2 nanocrystalline alloy

摘要

Fe(81.5)Si(0.5)B(4.5)P(11)Cu(0.5)C(2 )nanocrystalline alloy with high Fe concentration possesses a finely uniform nanocrystalline structure and numerous a-Fe crystals with a mean grain size of similar to 17 nm based on XRD patterns. Such crystals precipitated from the amorphous matrix. Favorable soft magnetic properties, small value of coercivity (H-c) of similar to 4.8 A/m, and high magnetic flux density (B-s) of similar to 1.53 T can be achieved by slow heat treatment (heating rate of similar to 10 degrees C/min). In this case, one-step annealing at a low heating rate is truly antipodal to Fe-Si-B-P-Cu alloy. We analyzed the nanocrystallized mechanism during annealing with various heating rates in Fe81.5Si0.5Si0.5B0.5P11Cu0.5C2 alloy, which inevitably simplified the industrial crystallization process by one-step annealing at a low heating rate.