OPTIMUM DESIGN OF ULTRAHIGH STRENGTH NANOLAYERED COMPOSITES

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This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Refinement of the microstructure in metallic multilayers from the micrometer-scale to the nanometer-scale often results in a break down of the classical Hall-Petch model relating strength to the microstructural length scale. The critical length scale at which this behavior breaks down is investigated both experimentally and theoretically. Using transmission electron microscopy and nanoindentation, we evaluated the microstructure and mechanical properties of Cu/Cr, Cu./Ni, and Cu/Nb multilayers that had different shear moduli mismatch between layers and lattice misfit strain between ... continued below

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20 p.

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KUNG, H. & AL, ET October 1, 2000.

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  • Los Alamos National Laboratory
    Publisher Info: Los Alamos National Lab., Los Alamos, NM (United States)
    Place of Publication: Los Alamos, New Mexico

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Description

This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Refinement of the microstructure in metallic multilayers from the micrometer-scale to the nanometer-scale often results in a break down of the classical Hall-Petch model relating strength to the microstructural length scale. The critical length scale at which this behavior breaks down is investigated both experimentally and theoretically. Using transmission electron microscopy and nanoindentation, we evaluated the microstructure and mechanical properties of Cu/Cr, Cu./Ni, and Cu/Nb multilayers that had different shear moduli mismatch between layers and lattice misfit strain between layers. Two-dimensional maps showing layer thickness and grain size ranges over which different deformation mechanisms operate were constructed using dislocation theory. The deformation mechanisms responsible for the breakdown of Hall-Petch behavior are discussed. By correlating the deformation mechanism maps with the experimental data, we show that these maps serve as guidelines for interpreting the scale-dependent deformation mechanisms in multilayers. Atomistic simulation was also used to evaluate the interaction between interfaces and glide dislocations to provide atomic scale insights into the deformation mechanisms.

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20 p.

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OSTI as DE00766220

Medium: P; Size: 20 pages

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  • Other Information: PBD: 1 Oct 2000

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  • Report No.: LA-UR-00-3109
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/766220 | External Link
  • Office of Scientific & Technical Information Report Number: 766220
  • Archival Resource Key: ark:/67531/metadc717664

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Office of Scientific & Technical Information Technical Reports

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  • October 1, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • April 7, 2017, 7:16 p.m.

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KUNG, H. & AL, ET. OPTIMUM DESIGN OF ULTRAHIGH STRENGTH NANOLAYERED COMPOSITES, report, October 1, 2000; Los Alamos, New Mexico. (digital.library.unt.edu/ark:/67531/metadc717664/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.