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Title: Finite Element Simulation and X-Ray Microdiffraction Study of Strain Partitioning in a Layered Nanocomposite

The depth-dependent strain partitioning across the interfaces in the growth direction of the NiAl/Cr(Mo) nanocomposite between the Cr and NiAl lamellae was directly measured experimentally and simulated using a finite element method (FEM). Depth-resolved X-ray microdiffraction demonstrated that in the as-grown state both Cr and NiAl lamellae grow along the 111 direction with the formation of as-grown distinct residual ~0.16% compressive strains for Cr lamellae and ~0.05% tensile strains for NiAl lamellae. Three-dimensional simulations were carried out using an implicit FEM. First simulation was designed to study residual strains in the composite due to cooling resulting in formation of crystals. Strains in the growth direction were computed and compared to those obtained from the microdiffraction experiments. Second simulation was conducted to understand the combined strains resulting from cooling and mechanical indentation of the composite. Numerical results in the growth direction of crystal were compared to experimental results confirming the experimentally observed trends.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [4]
  1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
  2. Mechanical Science and Engineering Department, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
  3. Mechanical Science and Engineering Department, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA, National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
  4. Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
Publication Date:
OSTI Identifier:
1259578
Grant/Contract Number:
AC02-06CH11357
Type:
Published Article
Journal Name:
Journal of Crystallography
Additional Journal Information:
Journal Volume: 2016; Related Information: CHORUS Timestamp: 2016-07-26 12:37:35; Journal ID: ISSN 2356-7317
Publisher:
Hindawi Publishing Corporation
Sponsoring Org:
USDOE
Country of Publication:
Country unknown/Code not available
Language:
English