EFFECT OF THICKNESS ON TEXTURE AND MAGNETIC-PROPERTIES OF MELTSPUN FE 6.5WT-PERCENT SI RIBBONS

Rapidly solidified FeSi6.5 tapes produced by meltspinning show in the as-quenched condition a weak {100}<011> texture for tapes thinner than 40-mu-m and a weak {100}<0kl> texture for thicker tapes. In the thicker tapes the <100> direction is tilted out of the surface normal in rolling direction up to 15-degrees [1]. This angle can be decreased or even eliminated by suitable thermomechanical treatment [1]. Simple surface-controlled grain growth at temperatures higher than 1200-degrees-C under oxygen pressure of about 5 x 10(-2) mbar increases the {100}<011> texture but does not change the tilting angle. Loss and coercivity measurements have been carried out on recrystallized and chemically thinned tapes. A linear relationship has been found between coercivity and reciprocal ribbon thickness d-1. Not only the total loss but also the dynamic loss show a minimum for a certain thickness d(d,min). With increasing frequency f the value of d(d,min) decreases. Minimal total losses occur for d(min) = 120-mu-m in the case of f = 50 Hz and d(min) = 55-mu-m in the case of f = 30810 Hz.