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Author

Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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Nanoindentation properties and the microstructure of grain boundary precipitate-free zones (PFZs) in an AlCuSiGe alloy

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Title
Nanoindentation properties and the microstructure of grain boundary precipitate-free zones (PFZs) in an AlCuSiGe alloy
Author
Radmilovic, V.Taylor, C.Lee, ZonghoonTolley, A.Mitlin, D.Dahmen, U.
Keywords
SI-GE-CU; AL-SI; ELECTRON-MICROSCOPE; METALS; DYNAMICS; VICINITY; SYSTEM; STEELS; MG
Issue Date
2007
Publisher
TAYLOR & FRANCIS LTD
Citation
PHILOSOPHICAL MAGAZINE, v.87, no.26, pp.3905 - 3919
Abstract
We have characterized the nanoscale mechanical properties of grain boundary precipitate-free zones (PFZ's) in an AlCuSiGe alloy, using combined nanoindentation and in-situ atomic force microscopy (AFM). These mechanical properties were then correlated to the composition, precipitate distribution and, indirectly, to the vacancy concentration within these regions, as analyzed by transmission electron microscopy and spectroscopy. Using these results we constructed a structure-zone map of the area adjacent to the grain boundary, which relates the reduced elastic modulus and nanoindentation hardness of the alloy to its graded microstructure. Our analysis indicates that the lowest hardness was found in the region where no precipitates are present at all, regardless of solute concentration. In regions where precipitation is different from that of the bulk, somewhat inferior mechanical properties are achieved.
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DOI
http://dx.doi.org/10.1080/14786430601153414
ISSN
1478-6435
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