The Internal Friction and Elastic Modulus of Amorphous Pd-Si and Fe-P-C Alloys

The internal friction and the shear modulus of the amorphous Pd_-Si_, Fe_-P_-C_7 and Fe_-Ni_-P_-C_5 alloys have been measured at about 0.5 Hz over a temperature range from room temperature to about 550℃. The internal friction rises steeply with temperature and shows maxima around the crystallization temperature. The activation energy for the steeply rising internal friction has been estimated by the two different procedures ; from the shift of the curve by the frequency change and from the slope of the 1n Q^ versus 1/T plot. The two values are very different, which indicates the existence of a wide distribution of activation energies. Crystallization of the amorphous alloys resulted in an increase of about 30% in the shear modulus