Details

Autor(en) / Beteiligte

• Wagner, Hannes
• Bedorf, Dennis
• Küchemann, Stefan
• Schwabe, Moritz
• Zhang, Bo
• Arnold, Walter
• Samwer, Konrad

Titel

Local elastic properties of a metallic glass

Ist Teil von

• Nature materials, 2011-06, Vol.10 (6), p.439-442

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The 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 10(4) 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.