Positron Annihilation Spectroscopy Characterization of Formation of Helium/Hydrogen-Vacancy Nano-Clusters in FeCr Alloy

Te Zhua, b, c, Baoyi Wanga, c, Xiangyu Liana, Shuoxue Jina, Runsheng Yua, Xingzhong Caoa, Qiu  Xub aMulti-discipline Research Center, Institute of High Energy Physics, CAS, Beijing 100049, China bInstitute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori-cho, Osaka 5900494, Japan cUniversity of Chinese Academy of Sciences, Beijing 100039, China

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In the present work, Fe9Cr model alloy was implanted with 100 keV He and 60 keV H ions at room temperature. Positron annihilation Doppler broadening spectroscopy was employed to detect (H, He)-V complexes with open volume in the irradiated specimens. The results show that the positron is sensitive to the relative position of the gas atoms decorating the open volume; i.e., to the configuration of the (H, He)-V complexes. The formation of H-vacancy clusters after H implantation and a large number of vacancies can be retained after H-V decomposes at room temperature. For the pre-implanted He situation (He + H), He-vacancy clusters are formed in advance and the post-implanted H introduces a large number of vacancies and decomposable H-vacancy clusters. The He-vacancy clusters forming in advance may recombine with vacancies and H atoms to form stable He-vacancy clusters and a small amount of He-H-V complex.

DOI:10.12693/APhysPolA.137.235 topics: slow positron beam, helium/hydrogen-vacancy clusters, irradiation damage