Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 69: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses VII - thermodynamics and structure

MM 69.3: Vortrag

Donnerstag, 23. März 2017, 18:00–18:15, IFW A

Effect of Co microalloying on the low-temperature heat capacity of Pd40Ni40P20 bulk metallic glass — •Rene Hubek1, Mikhail Seleznev2, Isabelle Binkowski1, Martin Peterlechner1, Sergiy Divinski1, and Gerhard Wilde11Institute of Materials Physics, University of Münster, Germany — 2Togliatty State University, Togliatty, Russia

The physical properties of bulk metallic glasses are a subject of intensive research especially with respect to their mechanical behavior. Recently it was shown that the mechanical properties of a model Pd40Ni40P20 bulk metallic glass could significantly be enhanced through cobalt microalloying [1]. The present study is focused on the impact of the microalloying on the low-temperature heat capacity. The results are discussed in comparison to the heat capacity data of a reference Pd40Ni40P20 glass, specifically concerning the impact of microalloying on the excess heat capacity at low temperatures that is known as "boson peak" and concerning its specific response on plastic deformation [2]. An additional magnetic heat capacity anomaly is observed in the low temperature region of Co-alloyed Pd40Ni40P20 glass. The effect of annealing on low-temperature heat capacities of as-cast and cold-rolled glasses is carefully analyzed.

N. Nollmann et al., Scripta Marerialia 111 (2016), 119-122
Yu. Mitrofanov et al., Phys. Review Letters 112 (2014)

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