Low temperature heat capacity of severely deformed metallic glass

Abstract

The low temperature heat capacity of amorphous materials reveals a low-frequency enhancement (boson peak) of the vibrational density of states, as compared with the Debye law. By measuring the low-temperature heat capacity of a Zr-based bulk metallic glass relative to a crystalline reference state, we show that the heat capacity of the glass is strongly enhanced after severe plastic deformation by high-pressure torsion, while subsequent thermal annealing at elevated temperatures leads to a significant reduction. The detailed analysis of corresponding molecular dynamics simulations of an amorphous Zr-Cu glass shows that the change in heat capacity is primarily due to enhanced low-frequency modes within the shear band region.

5 pages, 2 figures

Cited by in corpus (5)

• Low-energy quasilocalized excitations in structural glasses
• Atomistic Modelling of Thermal-Cycling Rejuvenation in Metallic Glasses
• Structural origins of the boson peak in metals: From high-entropy alloys to metallic glasses
• Atomistic mechanisms of dynamics in a two-dimensional dodecagonal quasicrystal
• Plasmon energy losses in shear bands of metallic glass