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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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Nanocrystalline-amorphous transitions in Al-Mo thin films: Bulk and surface evolution

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Title
Nanocrystalline-amorphous transitions in Al-Mo thin films: Bulk and surface evolution
Author
Ophus, C.Luber, E. J.Edelen, M.Lee, ZonghoonFischer, L. M.Evoy, S.Lewis, D.Dahmen, U.Radmilovic, V.Mitlin, D.
Keywords
Nanocomposite; Metallic glasses; Nanocrystalline materials; Surface roughness; High-resolution electron microscopy
Issue Date
200908
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, v.57, no.14, pp.4296 - 4303
Abstract
We investigate the bulk and surface features of the crystalline-amorphous transitions in binary Al-Mo alloy thin films as a function of Mo composition using transmission electron microscopy, X-ray diffraction and atomic force microscopy analysis, as well as thermodynamic modeling. Of the alloys tested, the minimum in the root mean square (rms) surface roughness and correlation length occurs at the Al-32 at.% Mo composition, which corresponds to the maximum volume fraction of the amorphous phase and the minimum volume fraction of the body centered cubic nanocrystallites. The rms surface roughness of the 32 at.% Mo films is on the order of a single nanometer, compared with nearly 80 nm for the 50 at.% Mo film. A structure-zone map is constructed to relate the surface morphology of the films to their bulk microstructure. A thermodynamic model developed by Miedema and coworkers was used to predict the general trends observed in the microstructural evolution as a function of film composition. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
URI
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DOI
http://dx.doi.org/10.1016/j.actamat.2009.05.029
ISSN
1359-6454
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