Abstract
The crystallization behavior and microstructure of (Fe0.9Co0.1)72.7Al0.8Si13.5B9-xCu1Nb3Tix(x = 0,1,2) alloys were analyzed by the differential scanning calorimetry (DSC) and X-ray diffractometry (XRD). The soft magnetic properties of alloys after thermal treatment were studied by the temperature dependence of initial permeability (μi-T curves). Experimental results show that the proper addition of Ti can decrease the onset temperature of primary crystallization Tx1 for precipitating soft magnetic phase from 506 °C for x = 0–487 °C for x = 1 and increase the onset temperature of second crystallization Tx2 from 669 °C for x = 0–703 °C for x = 2. The extended onset temperature of second crystallization Tx2 of 703 °C and crystallization temperature interval ΔTx of 199 °C make the 650oC-annealed (Fe0.9Co0.1)72.7Al0.8Si13.5B7Cu1Nb3Ti2 alloy exhibit superior magnetic softness at room- and high-temperatures. And the 610oC-annealed (Fe0.9Co0.1)72.7Al0.8Si13.5B8Cu1Nb3Ti1 alloy shows improved high-temperature magnetic softness at 450–650 °C with respect to Ti-free (Fe0.9Co0.1)72.7Al0.8Si13.5B9Cu1Nb3 alloy.
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