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

Abstract

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 $\left(111\right)$ 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:

Barabash, R. I. ^[1]; Agarwal, V. ^[2]; Koric, S. ^[3]; Jasiuk, I.  ^[2];

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Tischler, J. Z. ^[4]

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+ Show Author Affiliations

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:

Sun Jun 26 00:00:00 EDT 2016

Sponsoring Org.:

USDOE

OSTI Identifier:

1259578

Grant/Contract Number:  

AC02-06CH11357

Resource Type:

Published Article

Journal Name:

Journal of Crystallography

Additional Journal Information:

Journal Name: Journal of Crystallography Journal Volume: 2016; Journal ID: ISSN 2356-7317

Publisher:

Hindawi Publishing Corporation

Country of Publication:

Country unknown/Code not available

Language:

English