Atomic Dynamics of Bulk Metallic Glasses under Tensile 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 strongly limits their 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 surrounding these softer shear transformation zones (STZ). The collective rearrangement of the atoms in the STZ under load will be reflected in the atomic dynamics, especially in the low energy modes, as the origin of the glass-characteristic low energy modes is most likely in these more loosely packed regions (free volume) as well. We want to investigate the atomic dynamics, while our sample is stressed below the yield point, to look for any changes in the generalized vibrational density-of-states with applied stress and especially to search modes indicating the approach of the sudden failing of the material. We want to investigate the connection between the changing mechanical properties and the atomic dynamics of the BMG.
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SAMWER Konrad; KOZA Michael Marek and SUCK Jens Boie. (2014). Atomic Dynamics of Bulk Metallic Glasses under Tensile Stress. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-05-946
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