Bibliographical noteFunding Information:
This work was supported as part of the Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center funded by the U.S. Department of Energy , Office of Science, Office of Basic Energy Sciences under Award Number 2008LANL1026. The work was carried out in part in the Frederick Seitz Materials Research Laboratory (FS-MRL) Central Research Facilities, University of Illinois. Atom-probe tomography was performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT) whose local-electrode atom-probe (LEAP) homograph was purchased and upgraded with funding from NSF-MRI ( DMR-0420532 ) and ONR-DURIP ( N00014-0400798 , N00014-0610539 , N00014-0910781 ) Grants. Instrumentation at NUCAPT was supported by the Initiative for Sustainability and Energy at Northwestern (ISEN). NUCAPT is a Shared Facility at the Materials Research Center of Northwestern University, supported by the National Science Foundation’s MRSEC program (DMR-1121262). Stimulating discussions with Drs. A. Misra, and J. Carpenter (LANL), and Prof. A. Rollett (CMU) are gratefully acknowledged. We also thank Dr. M. Sardela (FS-MRL, UIUC) for his assistance with XRD characterization and texture measurements.