Atomic dynamics of bulk metallic glasses under tensil stress
In the application of bulk metallic glasses (BMG) their mechanical properties are the most important. They show an extreme strength at ambient temperature but fail abruptly when yield sets in, which limits the applications. This phenomenon is related to their disordered inhomegeneous structure, consisting of soft regions, in which the instability is initiated, and a network of hard regions between these shear transformation zones (STZ). The collective rearrangement of the atoms in the STZ will be reflected in the atomic dynamics, especially in the low energy modes, the origin of which is most likely in these more losely packed regions (free volume) as well. We want to investigate the atomic dynamics, while our sample is stressed below the yield point, to see any changes with applied stress and especially to look for modes indicating the approach of the sudden failing of the material. We want to investigate the connection beween the changing mechanical properties and the atomic dynamics of the BMG.
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SAMWER Konrad; KOZA Michael Marek and SUCK Jens Boie. (2012). Atomic dynamics of bulk metallic glasses under tensil stress. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-05-912
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