We discuss and demonstrate the application of recently developed spherical nanoindentation stress-strain protocols in characterizing the mechanical behavior of tungsten polycrystalline samples with ion-irradiated surfaces. It is demonstrated that a simple variation of the indenter size (radius) can provide valuable insights into heterogeneous characteristics of the radiation-induced-damage zone. We have also studied the effect of irradiation for the different grain orientations in the same sample.
Bibliographical noteFunding Information:
The authors acknowledge funding from Department of Energy, Nuclear Engineering Enabling Technologies (DOE-NEET) - Reactor Materials program # DE-FOA-0000799, and University of California Office of the President (UCOP) under Award Number 12 - LR237801 for this work. R.D. was the PI on the UCOP award. 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. SP gratefully acknowledges funding from the Los Alamos National Laboratory Director’s Postdoctoral Fellowship and University of Nevada, Reno start-up faculty funds for this work. The authors thank Dr. Cheng Sun (Idaho National Laboratory, ID) for help with the TEM measurements.