Abstract
Single crystal tungsten samples with (110) and (100) surface orientations were irradiated with 30 keV He+ at 900ºC to fluences of 3×1017 to 1×1019 He+/cm2 at normal incidence. The samples exhibited various microstructures and increasing sample mass loss as a function of increasing fluence for both cases. Pores observed on the sample surface at each fluence were ~45 nm in diameter merging into larger surface pores up to ~800 nm in length at the highest irradiation fluence of 1×1019 He+/cm2.
Acknowledgments
Funding for this research was provided through the University of Wisconsin–Madison Graduate Engineering Research Scholars Fellowship, and the Grainger and Greatbach Foundations. The authors gratefully acknowledge use of facilities and instrumentation at the University of Wisconsin–Madison Wisconsin Centers for Nanoscale Technology (wcnt.wisc.edu) partially supported by National Science Foundation through the University of Wisconsin Materials Research Science and Engineering Center (DMR-1720415).