Radiation damage studies of bulk metallic glass materials under proton irradiation and radioprotection studies for METU-DBL

Download

index.pdf

Date

2019

Author

Uslu, Pelin

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

554
views

312
downloads

Suitable material selection is critical for the sustainability of missions in radiation environments. Radiation tests are required for candidate materials before being used in these environments. While neutron and heavy ion tests are often performed on materials intended for the nuclear reactors, proton tests are necessary for space applications due to them being the dominant radiation. Generally, crystalline materials are used in radiation environments but, new material search is ongoing. One of such new generation is bulk metallic glasses (BMGs). They have received much attention due to their superior physical, chemical, mechanical and magnetic properties compared to their crystalline counterparts. Especially, new generations of Fe-based BMGs have great potential for these environments due to high strength and hardness as well as good corrosion resistance. Mostly neutron and heavy ions tests exist in literature. Here, proton tests for these materials were performed and the effects of proton irradiation on Fe-based BMGs for space radiation were studied. Fe-based BMG was produced by arc melting and then suction casting into copper mold in the form of a 10 cm long cylindrical rod with a diameter of 3 mm. In addition, commercially available 304 and 316 SS were tested with 30 MeV protons. Structural, thermal, mechanical and magnetic characterization techniques were employed to examine the effects of proton radiation on these materials. These tests which are the first time such a study has been performed in Turkey, were conducted at the new METU-Defocusing BeamLine (DBL) facility located inside the Turkish Atomic Energy Authority (TAEA) SANAEM Proton Accelerator Facility (PAF). This facility uses 15-30 MeV protons with a flux between 10textsuperscript{5} - 10textsuperscript{11} p/cmtextsuperscript{2}/s to test electronics. Also, studies for radioisotope production and radiation protection of sensitive electronic devices of METU-DBL are also presented here. Characterization studies of irradiated materials showed that the point defects were formed on the both BMGs and stainless steels after the irradiation. Any surface damage or new phase occurrence were not observed on these samples. After the irradiation, point defects were observed on the samples.

Subject Keywords

Metallic glasses., Bulk metallic glasses, effects of radiation, 30 MeV protons, space radiation.

URI

http://etd.lib.metu.edu.tr/upload/12623426/index.pdf
https://hdl.handle.net/11511/43583

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Radiation effect studies on partially crystalline bulk amorphous Fe-based metallic glass Kiceci, Pelin Uslu; Akdeniz, Mahmut Vedat; Demirköz, Melahat Bilge; Mehrabov, Amdulla (2022-02-01) The selection of appropriate materials for radiation environments is critical due to the harsh and aggressive conditions found in such environments, which are liable to degrade material properties. Therefore, durability of materials should be tested before being deployed. In this respect, proton tests are required for the materials to be used in the space environment because dominant galactic cosmic rays mostly comprised high energy protons. Bulk metallic glasses are candidate for space environment due to t...
Radiation Damage Studies for Fe-Based Alloys Under 30 MeV Proton Irradiation Uslu, Pelin; Akdeniz, Mahmut Vedat; Mehrabov, Amdulla; Demirköz, Melahat Bilge (2019-10-07) Materials should be radiation resistant for safe and reliable operation in radiation environments. Therefore, radiation tests are crucial for new candidate materials. Proton tests are critical for materials intended for use in nuclear reactors that produce hydrogen and hydrogen isotope ions and in the space environment that consists mostly of protons. Generally, crystalline materials are used in nuclear reactors and in space for their mechanical rob...
Installation of the METU Defocusing Beamline to Perform Space Radiation Tests Demirköz, Melahat Bilge; Poyrazoglu, Anil Berkay; Seckin, Caner; Uslu, Pelin; Celik, Nazire; Bulbul, Besna; Albarodi, Abdulrahman; Akcelik, Selen; Orhan, Yusuf; Avaroglu, Akanay; Kilic, Erinc; Saral, Caglar; Duran, Selcen Uzun; Yigitoglu, Merve (2019-01-01) METU Defocusing Beamline (DBL) is being installed at TAEA SANAEM Proton Accelerator Facility [1] for radiation tests of electronic devices to be used in satellites and spacecrafts which are exposed to a high radiation dose in space or at the Hi-Lumi LHC [2]. 15 - 30 MeV protons from the accelerator are spread out over an area of 15.40 X 21.55 cm to provide large irradiation in accordance to ESA/ESCC No. 25100 standard with METU-DBL. A wide selectable flux menu ranging from 10(5) - 10(10) p/cm(2)/s will be a...
Comparison of Productivity Plankton Types and Carbon Export Mechanisms in two Different Regimes of Subtropical North Atlantic a Modeling Study Salihoğlu, Barış (2016-02-15) Improved structure and mechanisms of carbon export and sequestration within marine ecosystem models is vital to better understand and predict changes in the global carbon cycle. We have implemented a 1D lower trophic ecosystem model at long-term time-series stations (BATS and ESTOC) in the North Atlantic for the years 1996-2000. We have investigated the dynamics of the productivity and carbon export, and mechanisms regulating them. Our simulations agree with the previous observations that show similar produ...
Thermal analysis applications in fossil fuel science - Literature survey Kök, Mustafa Verşan (2002-01-01) In this study, instances where thermal analysis techniques ( differential scanning calorimetry, thermogravimetry, differential thermal analysis, etc.) have been applied for fossil fuel characterisation and kinetics are reviewed. The scientific results presented clearly showed that thermal analysis is a well-established technique used in fossil fuel research area. The literature survey showed that thermal methods were important not only theoretically but also from a practical point of view.

Citation Formats

P. Uslu, “Radiation damage studies of bulk metallic glass materials under proton irradiation and radioprotection studies for METU-DBL,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Metallurgical and Materials Engineering., Middle East Technical University, 2019.