Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 57, Issue -, Pages 16-28Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2014.01.008
Keywords
Zirconium; Niobium; Texture; Deformation mechanisms; Accumulative roll bonding
Funding
- University of New Hampshire faculty startup funds
- Los Alamos National Laboratory LDRD program [20140348ER]
- UC Lab Fees Research Program [UCD-12-0045.15]
- Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
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We study the texture evolution and deformation mechanisms in a Zr/Nb layered composite using a combination of electron backscattered diffraction, dislocation density evolution modeling, and polycrystal plasticity simulations. Zr/Nb composites with individual layer thicknesses ranging from 1 to 4 mm one-millimeter to four-micrometers were successfully fabricated at room temperature by accumulative roll bonding. Measured texture data during rolling and stress-strain curves in compression are presented. Under severe plastic deformation, we show that the textures of each polycrystalline phase correspond to textures of severely rolled single-phase rolled Zr and Nb. A visco-plastic self-consistent (VPSC)-dislocation density based model is applied to predict the deformation textures in the individual phases. The model indicates that large-strain deformation in Zr is accommodated by prismatic, pyramidal, and anomalously basal slip, and in Nb by both {1 1 0} and {1 1 2} slip. Our findings suggest that the polycrystalline layers of four micrometers per phase are still too coarse for the bimetal interfaces to have an effect on the texture evolution. (C) 2014 Elsevier Ltd. All rights reserved.
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