Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 46: Liquid and Amorphous Metals

MM 46.2: Vortrag

Mittwoch, 14. März 2018, 17:15–17:30, TC 010

Rejuvenation behavior and specific heat capacity of Pd40Ni40P20 bulk metallic glass influenced by severe plastic deformation — •Hongbo Zhou, Niklas Nollmann, René Hubek, Martin Peterlechner, and Gerhard Wilde — Institute of Materials Physics, University of Münster, Germany

The effects of severe plastic deformation (high pressure torsion, HPT) on rejuvenation behavior and specific heat capacity have been investigated. The results of differential scanning calorimetry (DSC) illustrate that the as-cast metallic glasses could be rejuvenated effectively during the HPT. The deformed state glasses possess much more structural relaxation enthalpy in contrast with the as-cast state, and an enhanced rejuvenation could be achieved with increasing deformation. Besides, it is assumed that atomic re-arrangements take place as a consequence of HPT because the deformed state glasses have an apparently different crystallization behavior compared to the as-cast state. The results of low-temperature specific heat capacity measurements using a physical properties measurement system (PPMS) reveal that the heights of boson peak increase with a similar trend as function of strain. Moreover, the effects of rejuvenation on the mechanical properties will be discussed.