title: Low temperature heat capacity of a 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.
authors.affiliation: Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, D-48149 Münster, Germany.
authors.forename: Jonas
authors.initials: J
authors.lastname: Bünz
authors.affiliation: Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, TU Darmstadt, Jovanka-Bontschits-Straße 2, D-64287 Darmstadt, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Brink
authors.affiliation: National Institute of Materials Science, 1-2-1 Sengen, JP-305-0047 Tsukuba, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Tsuchiya
authors.affiliation: National Institute of Materials Science, 1-2-1 Sengen, JP-305-0047 Tsukuba, Japan.
authors.forename: Fanqiang
authors.initials: F
authors.lastname: Meng
authors.affiliation: Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, D-48149 Münster, Germany.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Wilde
authors.affiliation: Fachgebiet Materialmodellierung, Institut für Materialwissenschaft, TU Darmstadt, Jovanka-Bontschits-Straße 2, D-64287 Darmstadt, Germany.
authors.forename: Karsten
authors.initials: K
authors.lastname: Albe