Abstract
The thermal stability of the supercooled liquid region (DTx), defined by the difference between crystallization temperature (Tx) and glass transition temperature (Tg), and soft magnetic properties were investigated for Fe70Al5Ga2P12.652xC5.75B4.6Six(x50 – 4) and Fe77Al2.14Ga0.86P112xC5B4Six(x50 – 3) glassy alloys. The thermal stability, glass forming ability and effective permeability (me) at 1 kHz are improved with the replacement of P by 1–3 at. % Si for Fe70Al5Ga2P12.652xC5.75B4.6Six and by 1–2.6 at. % Si for Fe77Al2.14Ga0.86P112xC5B4Six . The DTx and the maximum thickness for glass formation ( tmax) reach maximum values of 60 K and 280 mm, respectively, for Fe70Al5Ga2P12.652xC5.75B4.6Six and 34 K and 220 mm, respectively, for Fe77Al2.14Ga0.86P112xC5B4Six at Si~at. %!/~Si~at. %!1P~at. %!!50.24. Core losses for Fe77Al2.14Ga0.86P8.4C5B4Si2.6 glassy alloy is much lower than that for amorphous Fe–Si–B alloy at the sheet thickness more than 70 mm. Therefore, it can be said that the Fe–Al–Ga–P–C–B–Si glassy alloys are useful for inductive applications because of their bulky shape and good soft magnetic properties. © 1998 American Institute of Physics. @S0021-8979~98!47211-6#
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