PIEZOMAGNETIC DEPENDENCES ON MAGNETIC BIAS FIELD OF ANNEALED AT 450-DEGREES-C FE-CU-NB-SI-B ALLOY

Magnetic field dependences of the piezomagnetic dynamics, magnetomecha nical coupling and elasticity moduli in the Fe73.5Cu1Nb3Si13.5B9 alloy in an as-quenched state and annealed in vacuum for 1 h at 450 degrees C were investigated. The maximum value of the magnetomechanical coupl ing coefficient was equal to 0.15 for the as-quenched state and 0.7 af ter annealing at 450 degrees C. The changes of the elasticity moduli ( Delta E effect) from about 60 to 180 GPa were observed after annealing at this temperature. These changes are connected with magnetostrictio n (equal to 25.8 x 10(-6) at saturation), internal stresses, defects, mechanical, magnetic and heat treatment history.