Intermittent Rejuvenation and the Correlation between Rejuvenation Behavior and the Boson Heat Capacity Peak of a Bulk Metallic Glass

Zhou H, Hubek R, Peterlechner M, Wilde G

Research article (journal) | Peer reviewed

Abstract

The influence of severe plastic deformation on the rejuvenation behavior and the boson heat capacity peak of a Pd40Ni40P20 metallic glass is investigated for as-cast and pre-annealed states. Deformation by high-pressure torsion leads to an intermittent rejuvenation behavior, quantified by the structural enthalpy and fictive temperature, in coincidence with a strongly enhanced excess heat capacity at low temperatures, quantified by the boson peak height. Correlations between structural enthalpy, fictive temperature and the boson peak height were analyzed. The results show that the boson peak is not only related to the structural enthalpy but associated with the so-called "overshoot" of the glass transition. A universal link is established between the fictive temperature and the boson peak height, even under the joint influence of deformation and heat treatment. The significance of this link is that it sheds light on the structural connection between high-temperature relaxation and low-temperature excess vibrational density of states.

Details about the publication

Volume2019
StatusPublished
Release year2019
Language in which the publication is writtenEnglish
KeywordsMetallic glass; High-pressure torsion; Heat capacity; Rejuvenation behavior; Boson peak

Authors from the University of Münster

Hubek, René
Professorship of Materials Physics (Prof. Wilde)
Peterlechner, Martin
Professorship of Materials Physics (Prof. Wilde)
Wilde, Gerhard
Professorship of Materials Physics (Prof. Wilde)