2011-05-22
AUTHORSHannes Wagner, Dennis Bedorf, Stefan Küchemann, Moritz Schwabe, Bo Zhang, Walter Arnold, Konrad Samwer
ABSTRACTThe nature of non-crystalline materials causes the local potential energy of a cluster of atoms or molecules to vary significantly in space. Different configurations of an ensemble of atoms in a metallic glass lead therefore to a distribution of elastic constants which also changes in space. This is totally different to their crystalline counterparts, where a long-range order exists in space and therefore a much more unified elastic modulus is expected. Using atomic force acoustic microscopy, we present data which show that the local so-called indentation modulus M indeed exhibits a wide distribution on a scale below 10 nm in amorphous PdCuSi, with ΔM/M≈30%. About 104 atoms are probed in an individual measurement. Crystallized PdCuSi shows a variation that is 10–30 times smaller and which is determined by the resolution of the microscope and by the polycrystalline structure of the material. More... »
PAGES439-442
http://scigraph.springernature.com/pub.10.1038/nmat3024
DOIhttp://dx.doi.org/10.1038/nmat3024
DIMENSIONShttps://app.dimensions.ai/details/publication/pub.1007316134
PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/21602807
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