Effect of Ti on glass-forming ability and magnetic properties of Fe81Si4B12-xP2Cu1Tix (x=0-3) soft magnetic alloys

The effect of Ti substitution for B on the glass-forming ability, microstructure and soft magnetic properties of Fe81Si4B12-xP2Cu1Tix (x = 0-3) alloy ribbons made by single roller melt spinning method were investigated. The experimental results demonstrate that proper doping of Ti effectively improves the glass-forming ability, widening the optimum annealing temperature range, decreasing the sensitivity of coercivity on annealing temperature, increasing the volume fraction of nanocrystalline alpha-Fe phase and suppressing the grain growth in this alloy system. For alloy ribbons Fe81Si4B12-xP2Cu1Tix (x = 0.5-2.5) annealed at 475 degrees C for 5 min, the saturation magnetostriction lambda(s) and the magnetic flux density B-8000 gradually decrease with increasing x, while the coercivity H-c decreases with increasing x until x = 2.0 and then increases. Nanocrystalline alloy Fe81Si4B10P2Cu1Ti2 shows excellent magnetic properties with low lambda(s) of 7 ppm, low H-c of 7.5 A/m and high B-8000 of 1.73 T which is promising for the future industrial applications.