Isothermal Kinetics and Relaxation Recovery of High-Frequency Shear Modulus in the Course of Structural Relaxation of Pd_(40)Cu_(30)Ni_(10)P_(20) Bulk Glass

摘要

Isothermal kinetics of relaxation of the high-frequency (1.4 MHz) shear modulus during structural relaxation of Pd_(40)Cu_(30)Ni_(10)P_(20) bulk metallic glass below the glass transition temperature is studied by an in situ method of contactless electromagnetic acoustic transformation. The kinetic law of relaxation is established. It is shown that quenching of aged samples from the supercooled liquid state leads to a decrease in the absolute value of shear modulus to below the initial value; the degree of subsequent isothermal relaxation of the modulus may be several times higher than the initial value. Possible reasons for relaxation and recovery of the shear modulus are considered.