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.
Bibliographical noteFunding Information:
The authors thank Dr. Ellen K. Cerreta and Dr. Rodney J. Mccabe (LANL) for help with sample preparation. The authors gratefully acknowledge support from the U.S. Department of Energy , Office of Nuclear Engineering , Nuclear Engineering Enabling Technologies (DOE-NEET) , as well as fruitful discussions with Dr. Irene Beyerlein. 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. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396.
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- Electron backscattering diffraction (EBSD)
- Indentation stress-strain
- Work hardening