Temperature dependence of the viscoelastic response of In, Sn and In-Sn alloys

The elastic modulus and the internal friction of Sn and the gamma-In-Sn pha se are measured with a two-component piezoelectric oscillator at 50 kHz in the temperature range from 296 to 390 K. For both materials the viscoelasti c responses at strains below 10(-6) are described in terms of a Debye peak characterized by an effective activation enthalpy of 54.8 and 20.4 kJ/mol, for Sn and the gamma-In-Sn phase, respectively. Due to their higher damping , the dynamic mechanical responses of In and the eutectic In-Sn were measur ed with a three-components piezoelectric resonator between 296 and 390 K at 50 kHz. The temperature dependence of the internal friction of the eutecti c can be well described iu terms of a single relaxation time with an effect ive activation enthalpy of 38 kJ/mol. Indium is not only amplitude dependen t but also exhibits thermal hysteresis. (C) 2000 Elsevier Science S.A. All rights reserved.