Investigations of orientation and length scale effects on micromechanical responses in polycrystalline zirconium using spherical nanoindentation

Siddhartha Pathak, Surya R. Kalidindi, Nathan A. Mara

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Here we investigate the elastic and plastic anisotropy of hexagonal materials as a function of crystal orientation using a high-throughput approach (spherical nanoindentation). Using high purity zirconium as a specific example, we demonstrate the differences in indentation moduli, indentation yield strengths and indentation post-elastic hardening rates over multiple grain orientations. These results are validated against bulk single crystal measurements, as well as data from cubic materials. By varying the indenter size (radius), we are also able to demonstrate indentation size effects in hexagonal materials, including possible signatures of strain hardening due to twin formation in the nanoindentation stress-strain curves.

Original languageEnglish (US)
Pages (from-to)241-245
Number of pages5
JournalScripta Materialia
Volume113
DOIs
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.

Keywords

  • Electron backscattering diffraction (EBSD)
  • Indentation stress-strain
  • Nanoindentation
  • Twinning
  • Work hardening

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