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weijiao木蟲 (正式寫手)
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NM上metallic glass 最新文章 已有2人參與
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Local elastic properties of a metallic glass Hannes Wagner,1 Dennis Bedorf,1 Stefan Küchemann,1 Moritz Schwabe,1 Bo Zhang,1 Walter Arnold1, 2 & Konrad Samwer1 Nature Materials Year published: (2011) DOI: doi:10.1038/nmat3024 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 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. 鏈接:http://www.nature.com/nmat/journ ... /full/nmat3024.html |
鐵桿木蟲 (著名寫手)
鐵桿木蟲 (著名寫手)
金蟲 (初入文壇)

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