Crossover and normal structural relaxation in naturally aged glassy Pd40Cu30Ni10P20

摘要

Measurements of Young's modulus relaxation at elevated temperatures in glassy Pd40Cu30Ni10P20 stored at room temperature for nine years are performed. It is found that testing in a wide range above room temperature leads to the crossover relaxation, which is absent in the as-prepared glass. At high testing temperatures, the crossover behavior changes into normal log-time relaxation kinetics. The crossover relaxation is accompanied by low temperature endothermal heat reaction, which is followed by exothermal heat flow characteristic of normal structural relaxation below the glass transjtion. Structural rejuvenation of samples by rapid quenching from the supercooled liquid state drastically changes the relaxation kinetics removing the crossover almost completely.