Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 22: Liquid and Amorphous Metals - Metallic Glass

MM 22.1: Talk

Tuesday, March 17, 2020, 10:15–10:30, IFW D

Effect of Co micro-alloying on thermodynamic and kinetic properties of a Pd₄₀Ni₄₀P₂₀ bulk metallic glass — •Rene Hubek, Isabelle Binkowski, Martin Peterlechner, Sergiy Divisinki, and Gerhard Wilde — Institute of Materials Physics, University of Münster, Germany

The physical properties of bulk metallic glasses are subject of intense research especially with respect to their mechanical behavior. Recently, it was shown that the mechanical properties of a Pd₄₀Ni₄₀P₂₀ bulk metallic glass could significantly be enhanced through cobalt micro-alloying [1]. In this report, we are focusing on the low-temperature heat capacity and shear band diffusion measurements. The results are discussed in comparison to the reference Co-free Pd40Ni40P20 glass [2, 3]. The response of the excess heat capacity at low temperatures, known as the boson peak, on plastic deformation and post-deformation annealing is thoroughly examined. Furthermore, the influence of annealing and micro-alloying on the shear band diffusion is investigated. These data are discussed with respect to the relaxation behavior. The correlated study of thermodynamic and kinetic properties of deformed glasses provides further insights into origin of plasticity enhancement by Co-micro-alloying of PdNiP-glass.

[1] N. Nollmann et al., Scripta Materialia 111 (2016), 119-122

[2] Y.P. Mitrofanov et al, Acta Materialia 90 (2015) 318-329.

[3] I. Binkowski et al, Acta Materialia 109 (2016) 330-340.