Plastic anisotropy and slip systems in ringwoodite deformed to high shear strain in the Rotational Drickamer Apparatus

Lowell Miyagi, George Amulele, Kazuhiko Otsuka, Zhixue Du, Robert Farla, Shun-Ichiro Karato

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

High shear strain deformation experiments up to equivalent strains of 180% were performed on ringwoodite at conditions of 23 GPa and 1800 K. At very large shear strains, deviation in the strengths of the (3 1 1) and (4 0 0) lattice planes is observed, indicating plastic anisotropy. Lattice strain theory was applied to calculate effective viscosities of the available slip systems from the observed plastic anisotropy. We find that the effective viscosities (unitless) are proportional to 0.43, 0.46, and 1.54 for the {1 1 1}View the MathML source, View the MathML source〈1 1 0〉 and {0 0 1}View the MathML source slip systems respectively. This indicates that {1 1 1}View the MathML source slip is slightly softer than View the MathML sourceView the MathML source at these conditions. Additionally the {1 1 1}View the MathML source slip system has significantly more symmetric variants than the slip systems involving other lattice planes, thus it is expected to dominate deformation. This is confirmed by polycrystal plasticity modeling using the viscoplastic self-consistent code (VPSC) which indicates that simulations with dominant {1 1 1}View the MathML source slip provide the best match to experimental textures.
Original languageEnglish
Pages (from-to)244-253
Number of pages10
JournalPhysics of the Earth and Planetary Interiors
Volume228
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • ringwoodite
  • high-pressure
  • high-temperature
  • deformation
  • rotational drickamer apparatus
  • plastic anisotropy
  • texture

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