Nonlinear relaxational ultrasonic absorption in metallic glasses

Achieving high energy absorption capacity in cellular bulk metallic glasses

Cellular bulk metallic glasses (BMGs) have exhibited excellent energy-absorption performance by inheriting superior strength from the parent BMGs. However, how to achieve high energy absorption capacity in cellular BMGs is vital but mysterious. In this work, using step-by-step observations of the deformation evolution of a series of cellular BMGs, the underlying mechanisms for the remarkable en...

Superconductivity in Metallic Glasses

Calculation of the non-linear relaxational acoustic attenuation in glasses

The non-linear relaxational acoustic attenuation in amorphous materials is calculated by a perturbation method. A saturation of the attenuation is found for insulating glasses. On the contrary an increase of attenuation is obtained in ideal glassy metals where relaxation is due to electrons only. In the case of real amorphous metals, where both electrons and phonons are active in the relaxation...

Cluster-assembled metallic glasses

A bottom-up approach to nanofabricate metallic glasses from metal clusters as building blocks is presented. Considering metallic glasses as a subclass of cluster-assembled materials, the relation between the two lively fields of metal clusters and metallic glasses is pointed out. Deposition of selected clusters or collections of them, generated by state-of-the-art cluster beam sources, could le...

Thermal rejuvenation in metallic glasses

Structural rejuvenation in metallic glasses by a thermal process (i.e. through recovery annealing) was investigated experimentally and theoretically for various alloy compositions. An increase in the potential energy, a decrease in the density, and a change in the local structure as well as mechanical softening were observed after thermal rejuvenation. Two parameters, one related to the anneali...