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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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Tensile behavior of Al1-xMox crystalline and amorphous thin films

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Title
Tensile behavior of Al1-xMox crystalline and amorphous thin films
Author
Gianola, D. S.Lee, ZonghoonOphus, C.Luber, E. J.Mitlin, D.Dahmen, U.Hemker, K. J.Radmilovic, V. R.
Keywords
Alloy compositions; Amorphous metals; Amorphous phase; Amorphous thin films; Body-centered cubic; Composition ranges; Cosputtering; Elastic properties; Face-centered cubic; Free-standing thin films; Mechanical behavior; MEMS/NEMS; Micro-structural; Mo content; Nanocrystalline metal; Plastic property; Poisson's ratio; Rule of mixture; Single-step; Solute strengthening; Tensile behaviors; Two-phase region; Ultra-fine-grained
Issue Date
201303
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, v.61, no.5, pp.1432 - 1443
Abstract
The exceptional strength and distinct deformation physics exhibited by pure ultrafine-grained and nanocrystalline metals in comparison to their microcrystalline counterparts have been ascribed to the dominant influence of grain boundaries in accommodating plastic flow. Such grain-boundary-mediated mechanisms can be augmented by additional strengthening in nanocrystalline alloys via solute and precipitate interactions with dislocations, although its potency is a function of the changes in the elastic properties of the alloyed material. In this study, we investigate the elastic and plastic properties of Al1-xMox alloys (0 <= x <= 0.32) by tensile testing of sputter-deposited freestanding thin films. Isotropic elastic constants and strength are measured over the composition range for which three microstructural regimes are identified, including solid solutions, face-centered cubic and amorphous phase mixtures and body-centered cubic (bcc)/amorphous mixtures. Whereas the bulk modulus is measured to follow the rule of mixtures over the Mo composition range, the Young's and shear moduli do not. Poisson's ratio is non-monotonic with increasing Mo content, showing a discontinuous change at the onset of the bcc/amorphous two-phase region. The strengthening measured in alloyed thin films can be adequately predicted in the solid solution regime only by combining solute strengthening with a grain boundary pinning model. The single-step co-sputtering procedure presented here results in diversity of alloy compositions and microstructures, offering a promising avenue for tailoring the mechanical behavior of thin films.
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DOI
http://dx.doi.org/10.1016/j.actamat.2012.11.020
ISSN
1359-6454
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