Abstract: FeCuNbSiB amorphous alloy＇s strips with 25μm thickness and 4. 5mm width single - roller method. The stress impedance effect is investigated by 4294A impedance analyzer. And carries on the heat treatment to eliminate the remaining stress. The result show when the test frequency is lower than 20 MHz, the FeCuNbSiB crystalless strip stress impedance effect is smaller, along with frequency increasing, the erystalless strip stress impedance effect appeared obviously strengthening; the crystalless strip stress impedance effect increase after the heat treatment, also elevates the stress impedance effect increase along with the heat treatment temperature.

Key words: amorphous, strain, impedance, heat treatment