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

ELIDA B. HERMIDA; DIEGO G. MELO; JULIO C. AGUIAR; DANIEL E. LÓPEZ

Journal of Alloys and Compounds

Elsevier

Año: 2000 vol. 310 p. 91 - 96

0925-8388

The elastic modulus and the internal friction of Sn and the g-In–Sn phase are measured with a two-component piezoelectric oscillator 26 at 50 kHz in the temperature range from 296 to 390 K. For both materials the viscoelastic responses at strains below 10 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 g-In–Sn phase, respectively. Due to their higher damping, the dynamic mechanical responses of In and the eutectic In–Sn were measured with a three-components piezoelectric resonator between 296 and 390 K at 50 kHz. The temperature dependence of the internal friction of the eutectic can be well described in terms of a single relaxation time with an effective activation enthalpy of 38 kJ /mol. Indium is not only amplitude dependent but also exhibits thermal hysteresis.