Analyzing point defect polarization in tungsten and tungsten carbide under high gamma irradiation for radiation shielding applications
Popov E.P. Donkov A.A. Trung N.V.M. Samadov S.F. Sidorin A.A. Orlov O.S. Mahmudov H.M. Khiem L.H. Samedov O.A. Huseynov H.J. Mirzayeva D.M. Opakhai S. Demir E. Mirzayev M.N.
November 2024Elsevier Ltd
International Journal of Refractory Metals and Hard Materials
2024#124
In this study, polycrystalline tungsten and tungsten carbide samples were irradiated with gamma rays at energies of 1.17 MeV and 1.33 MeV, respectively. The irradiation was performed using an “MRX-γ-25 M” radiation camera with an activity of approximately 6.54 Gy/s. Doppler positron spectroscopy (DPS) and positron lifetime spectroscopy (PALS) were utilized to investigate the mechanisms of defect formation in the polycrystalline structure of tungsten samples at different doses of gamma irradiation. In the initial tungsten sample, a significant number of free monovacancy (1 V) clusters were present. An increase in the positron lifetime component τ1 was observed with increasing gamma irradiation, accompanied by a decrease in its intensity. The τ2 value (218 ± 2 ps) suggests the presence of divacancies with a considerable intensity (∼20%). As the gamma dose accumulated, a dynamic evolution of structural defects was evident. The tungsten carbide (WC) samples displayed greater plasticity in response to increasing gamma irradiation doses. Changes in the void volume ratio within the samples were recorded as the gamma dose increased, and movement of these voids towards the surface was observed. Additionally, the operational limits of gamma-irradiated tungsten were assessed, determining a functional threshold of up to 3.378 MGy. This study provides valuable insights into the defect dynamics and structural changes in tungsten and tungsten carbide under gamma irradiation, contributing to the understanding of their behavior in radiation environments.
Defect polarization , DPS , Gamma irradiation , Hard materials , PLTS , Point defects , Vacancy
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International Intergovernmental Organization Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, 1784, Bulgaria
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, 1784, Bulgaria
Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, 10000, Viet Nam
Institute of Radiation Problems, Ministry of Science and Education Republic of Azerbaijan, Baku, АZ1143, Azerbaijan
Khazar University, Baku, 1096, Azerbaijan
Azerbaijan Architecture and Construction University, Baku, AZ 1073, Azerbaijan
Institute of Physics of the Ministry of Science and Education of the Republic of Azerbaijan, Baku, AZ1143, Azerbaijan
Western Caspian University, Baku, AZ1001, Azerbaijan
L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Yeditepe University, Physics Department, Istanbul, 34755, Turkey
International Intergovernmental Organization Joint Institute for Nuclear Research
Institute of Solid State Physics
Institute for Nuclear Research and Nuclear Energy
Institute of Physics
Institute of Radiation Problems
Khazar University
Azerbaijan Architecture and Construction University
Institute of Physics of the Ministry of Science and Education of the Republic of Azerbaijan
Western Caspian University
L.N. Gumilyov Eurasian National University
Yeditepe University
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