Abstract
Specimens of the metallic glasses a-Pd77.5Ni6Si16.5, a-Pd85.5Si14.5, a-Pd77.5Cu6Si16.5, a-Fe40Ni40P12B8 and a-Pd80Si20 are studied by using a mini-inverted torsion pendulum (the mass of the inertial part is about 6 g) to measure simultaneously the temperature variation of the internal friction (IF), the relative shear modulus (f/f0)2 and the relative change in electric resistance Delta R/R0 in vacuum. Two IF peaks, Pg and Px, corresponding to the glass transition temperature Tg and the crystallisation temperature Tx are observed for all specimens except a-Pd80Si20. For a-Pd80Si20, only one IF peak is observed but this tends to split into two IF peaks when the scanning rate increases. Corresponding sudden changes are observed in the relative shear modulus and electric resistance at Tg and Tx. It is suggested that the glass transition in metallic glass occurring during heating is a quasi-reversible, quasi-first-order phase transformation and the measurements of IF, (f/f0)2 and Delta R and with the differential scanning calorimeter are repeatable if the highest temperature is about 30 K below Tx.
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