Bulk texture evolution of Cu-Nb nanolamellar composites during accumulative roll bonding

J. S. Carpenter, S. C. Vogel, J. E. Ledonne, D. L. Hammon, I. J. Beyerlein, N. A. Mara

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148 Scopus citations

Abstract

A combination of accumulative roll bonding (ARB) and rolling is used to fabricate nanolamellar Cu-Nb multilayers with individual layer thicknesses (h) of 600 μm ≥ h ≥ 10 nm with a total strain imposed between 0.5 and 11.6. Neutron diffraction, scanning electron microscopy and transmission electron microscopy are used to characterize the microstructures and measure orientation distribution functions of both phases as a function of layer thickness. Fiber plots are calculated from the orientation distribution functions in order to understand the texture evolution in the Cu and Nb layers with increasing strain. Results are compared with rolling studies of single phase Cu, single phase Nb, and cast Cu-20 wt.% Nb composite. Results indicate that textures develop in the Cu and Nb layers during ARB that are distinct from classical rolling textures frequently observed both in their single-phase counterparts and in rolled composites. The atypical texture that develops shows a preferential strengthening of specific β fiber components at the expense of others in Cu and a strengthening of the α fiber at the expense of the γ fiber in Nb. No dynamic recrystallization is observed in Cu, even at strains above 99.99%, further delineating the behavior from single phase and composite behavior previously observed. Viscoplastic self-consistent (VPSC) polycrystal simulations were carried out to provide an understanding of the texture evolution in accumulative roll bonding. Enforcing planar slip in Cu leads to texture evolution for VPSC consistent with observations. A reasonable fit for Nb could be produced via the selection of specific {1 1 0} and {1 1 2} slip systems.

Original languageEnglish (US)
Pages (from-to)1576-1586
Number of pages11
JournalActa Materialia
Volume60
Issue number4
DOIs
StatePublished - Feb 2012
Externally publishedYes

Bibliographical note

Funding Information:
The authors are grateful for valuable discussions with Prof. A.D. Rollett of Carnegie Mellon University, Dr S. Lim of the Singapore Institute of Manufacturing Technology, and Dr A. Kanjarla of LANL. The authors also acknowledge F. Bachmann (Bergakademie Freiberg, Germany) for development of the script to symmetrize pole figures in mtex. They also appreciate the helpful comments made by the anonymous referee. This work was funded through Los Alamos National Laboratory Directed Research and Development (LDRD) Project DR20110029. This work has benefited from the use of the Lujan Neutron Scattering Center at LANSCE, which is funded by the Office of Basic Energy Sciences (DOE). Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract DE AC52 06NA25396.

Keywords

  • Accumulative roll bonding
  • Metal
  • Multilayer
  • Nanocomposite
  • Texture

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