Metallic nanolaminates, composed of alternating layers of two dissimilar metals, have attracted significant attention due to both their high strengths and their potential for excellent microstructural stability. While nanolaminates have traditionally been available only in thin-film form, advances in the severe plastic deformation process of accumulative roll bonding (ARB) have enabled the production of 4-mm-thick sheets of copper-niobium nanolaminates containing over 200,000 individual layers (a nominal layer thickness of <20 nm). The ability to produce bulk nanolaminates has greatly expanded the potential applications for these materials and has motivated investigations into formability, deformation behavior, and joining techniques. This paper presents an overview of both the ARB processing technique and recent investigations into the deformation behavior of these novel materials.
Bibliographical noteFunding Information:
The authors wish to acknowledge Kirk Fields of the University of California Santa Barbara for his assistance with mechanical testing and specimen design. T.N. was supported by the Department of Defense through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program. J.T.A. and T.M.P. wish to acknowledge support by the UC Lab Fees Research Program # UCD-12-0045.15. N.A.M. and I.J.B. gratefully acknowledge support by the Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number 2008LANL1026. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science.
© 2014, Springer Science+Business Media New York and ASM International.
- Accumulative roll bonding
- Kink bands
- Polarized light microscopy
- Severe plastic deformation