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Mcclellan, K. J.
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document
Heavy ion irradiation effects in zirconium nitride
Abstract
Polycrystalline zirconium nitride (ZrN) samples were irradiated with He <sup>+</sup>, Kr <sup>++</sup>, and Xe <sup>++</sup> ions to high (>1·10 <sup>16</sup> ions/cm <sup>2</sup>)fluences at ∼100 K. Following ion irradiation, transmission electronmicroscopy (TEM) and grazing incidence X-ray diffraction (GIXRD) wereused to analyze the microstructure and crystal structure of thepost-irradiated material. For ion doses equivalent to approximately 200displacements per atom (dpa), ZrN was found to resist any amorphizationtransformation, based on TEM observations. At very high displacementdamage doses, GIXRD measurements revealed tetragonal splitting of someof the diffraction maxima (maxima which are associated with cubic ZrNprior to irradiation). In addition to TEM and GIXRD, mechanical propertychanges were characterized using nanoindentation. Nanoindentationrevealed no change in elastic modulus of ZrN with increasing ion dose,while the hardness of the irradiated ZrN was found to increasesignificantly with ion dose. Finally, He <sup>+</sup> ion implanted ZrNsamples were annealed to examine He gas retention properties of ZrN as afunction of annealing temperature. He gas release was measured using aresidual gas analysis (RGA) spectrometer. RGA measurements wereperformed on He-implanted ZrN samples and on ZrN samples that had alsobeen irradiated with Xe <sup>++</sup> ions, in order to introduce highlevels of displacive radiation damage into the matrix. He evolutionstudies revealed that ZrN samples with high levels of displacementdamage due to Xe implantation, show a lower temperature threshold for Herelease than do pristine ZrN samples.