Radiation Defects in HCC Materials at Atomic Spatial Level

Abstract:

Diagnostics of the irradiated structure was carried out using the field ion microscopy technique. Modes of radiation exposure for development of amorphized states in subsurface regions of platinum are determined. It is shown that radiation exposure of pure metals with an energy of E = 30 keV under variation of the fluence of the charged argon ion beams by two orders of magnitude (10¹⁶ to 10¹⁸ ions/cm²) produces a significant effect on the kinetics of defect formation in the subsurface regions of irradiated materials. As a result of irradiation up to a higher fluence (F = 10¹⁷ ions/cm²), the effect of formation of the block nanocrystalline structure (at the block size of 1–5 nm) is observed in subsurface regions at a depth of at least 20 nm from the irradiated surface. It is found that the phenomenon of metal amorphization in the subsurface regions occurs up to a sample depth of 12 nm under an increase in the fluence to 10¹⁸ ions/cm² and the above irradiation energies. Experimental results on atomic–spatial investigation of radiative defect formation in surface layers of materials, initiated by ion implantation (in Cu₃Au: E = 40 keV, F = 10²⁰ ion/m², j = 10^–3 A/cm²), are considered. The experimentally established average size of a radiation cluster (disordered zone) in the alloy after ion bombardment is 4 × 4 × 1.5 nm.

• Periodical: Key Engineering Materials (Volume 781)
• Pages: 14-19
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.781.14
• Online since: September 2018
• Authors: Vladimir Ivchenko*
• Keywords: Ar⁺ Beams, Cascades of Atomic Displacements, Field Ion Microscopy, Radiation Defects

References

[1] M. I. Guseva, Ion Implantation, in: Semiconductor Materials, Developments in Science and Technology, Ser.: Physical Principles of Laser Beam Technology, VINITI, Moscow, 1989 (in Russian).

[2] V.V. Ovchinnikov, Radiation-dynamic effects. Potential for producing condensed media with unique properties and structural states, Physics Uspekhi 51 (2008) 955-964.

DOI: 10.1070/pu2008v051n09abeh006609

[3] J. Poate, G. Foti, D. Jacobson (eds.), Surface Modification and Alloying by Laser, Ion, and Electron Beams, Plenum Press, New York, (1983).

DOI: 10.1007/978-1-4613-3733-1

[4] V.A. Ivchenko, E.V. Medvedeva, The effect of the formation of nanostates in irradiated ions Pt, Izv. Vyssh. Uchebn. Zaved. Fiz. 8/2 (2009) 410–412.

[5] V.A. Ivchenko, N.N. Syutkin, L.Yu. Kuznetsova, Effect of amorphization in near-surface volumes of ion-implanted alloys, Tech. Phys. Lett. 26 (2000) 541–543.

DOI: 10.1134/1.1262905

[6] V. A. Ivchenko, N.N. Syutkin, A.Yu. Bunkin, FIM investigation of ion-implanted Cu3Au alloy, J. Phys. 49–C6 (1988) 379–383.

DOI: 10.1051/jphyscol:1988665

[7] V.A. Ivchenko, E.V. Medvedeva, Modification of nanostructured states in ion-implanted platinum, Bull. Russ. Acad. Sci.: Phys. 74 (2010) 217–220.

DOI: 10.3103/s1062873810020255

[8] V.A. Ivchenko, Field ion microscopy of nanomaterials received after powerful external influences, Nanomater. Nanostrukt. XXI Vek. 1 (2012) 42–53.

[9] K.M. Boowkett, D.A. Smith, Field-Ion Microscopy, in: Defects in Crystalline Solids, North Holand Publishing Company, Amsterdam, London, (1970).