Acknowledgement
This study was mainly supported by the National Research Foundation (NRF) of the MSIT of the Republic of Korea as an Engineering Research Center (No. 2016R1A5A101391921) and Nuclear R&D Program (2019M1A7A1A0208834412). Authors appreciate POSCO for helping with the manufacturing of ingots and conducting the thermo-mechanical processing. In addition, we are grateful to the staff in the Texas A&M Ion Beam Lab. for heavy ion irradiation experiments.
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