Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 48: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses III - plasticity and hetererogeneities

MM 48.5: Vortrag

Mittwoch, 22. März 2017, 17:00–17:15, IFW A

Micro-alloying of Gd to a PdNiP-based bulk metallic glass — •Christian Buchholz, Niklas Nollmann, Harald Rösner, and Gerhard Wilde — Institut für Materialphysik, WWU Münster, Münster, Deutschland

Bulk metallic glasses (BMGs) are well known for their high hardness but also to exhibit almost no ductility when reaching the end of the elastic deformation range. It has been recently shown [N. Nollmann et al., Scripta Mater. (2015), http://dx.doi.org/10.1016/j.scriptamat.2015.08.030] that micro-alloying applied to Pd₄₀Ni₄₀P₂₀ by adding small amounts of Co or Fe (around 1 at%) can strongly improve or worsen the mechanical properties. Here we present new results obtained after adding Gd to Pd₄₀Ni₄₀P₂₀. Similar to Co, Gd also enhances the ductility of the produced BMG. However, the phase transformation from the undercooled liquid to the crystalline state is also strongly affected by the Gd addition, resulting in a highly unusual crystallization kinetics. The results and consequences are discussed.