Texture evolution in two-phase Zr/Nb lamellar composites during accumulative roll bonding

Marko Knezevic, Thomas Nizolek, Milan Ardeljan, Irene J. Beyerlein, Nathan A. Mara, Tresa M. Pollock

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

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 {110} and {112} 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.

Original languageEnglish (US)
Pages (from-to)16-28
Number of pages13
JournalInternational Journal of Plasticity
Volume57
DOIs
StatePublished - Jun 2014

Bibliographical note

Funding Information:
MK and MA were supported by the University of New Hampshire faculty startup funds. IJB was supported by a Los Alamos National Laboratory LDRD program 20140348ER. TMP and NAM wish to acknowledge support by the UC Lab Fees Research Program # UCD-12-0045.15. TN was supported by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program.

Keywords

  • Accumulative roll bonding
  • Deformation mechanisms
  • Niobium
  • Texture
  • Zirconium

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