Study of the radiation disordering mechanisms of AlN ceramic structure as a result of helium swelling
Kozlovskiy A.L. Zdorovets M.V.
August 2021Springer
Journal of Materials Science: Materials in Electronics
2021#32Issue 1621658 - 21669 pp.
In this work, using X-ray diffraction patterns recording method in a scan φ = 0°–360°, the kinetics of changes in geometry of crystallites, as well as crystal lattice deformation along the a and c axes of aluminum nitride ceramic as a result of helium swelling, is shown. The degradation kinetics of AlN ceramic was modeled by irradiation with low-energy He2+ ions (40 keV) with radiation doses of 1016–1018 ion/cm2. The choice of energies, doses and type of ions is due to the possibility of modeling the processes of helium swelling and subsequent destruction of the near-surface layer up to 0.5 μm thick. During the experiments, it was shown that the main structural distortions occur at doses above 1017 ions/cm2 and are associated with the occurrence of anisotropy of the form of crystallites, as well as deformation of the crystal lattice along both axes. The anisotropy of the crystallite shape that occurs under large dose irradiation is due to grain crushing processes, the formation of amorphous inclusions in the structure of the near-surface layer, as well as the processes of destruction and subsequent corrosion of the near-surface layer exposed to radiation. It has been found that an increase in radiation dose above 1017 ion/cm2 results in a large number of helium bubbles in the structure of the near-surface layer, which led to surface degradation and swelling. At the same time, the results obtained made it possible to assess radiation swelling resistance degree of AlN ceramic during irradiation with helium ions and its subsequent accumulation, which showed that the critical radiation doses causing the irreversible catastrophic nature of structural deformations are doses of 5–7 × 1017 ions/cm2.
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The Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
L.N. Gumilyov Eurasian National University, Nur-Sultan, 010008, Kazakhstan
Ural Federal University, Yekaterinburg, Russian Federation
The Institute of Nuclear Physics
L.N. Gumilyov Eurasian National University
Ural Federal University
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