Fast relaxation in metallic glasses studied by measurements of the internal friction at high frequencies

TL;DR

This study reports the first observation of fast relaxation peaks in metallic glasses at high frequencies, revealing relaxation times around 0.3 microseconds and providing new insights into their internal friction behavior.

Contribution

The paper introduces the first measurement of fast relaxation in metallic glasses using high-frequency internal friction techniques, expanding understanding of their dynamic properties.

Findings

12 out of 14 metallic glasses show relaxation peaks at 400-500 K

Relaxation time is approximately 0.3 microseconds

Fast relaxation is reported for the first time in metallic glasses

Abstract

We performed high-frequency (0.4 to 1.7 MHz) measurements of the internal friction (IF) on 14 bulk metallic glasses (MGs). It is found that 12 of these MGs display relaxation IF peaks at temperatures T= 400-500 K, which are weakly affected by heat treatment within the amorphous state. The corresponding relaxation time is about 0.3 microseconds. This fast relaxation is reported for the first time in the literature. The apparent activation enthalpy for 4 MGs is determined.