|About this Abstract
||MS&T21: Materials Science & Technology
||Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
||Effects of Annealing and Ion Irradiation on Helium Implanted NiCo and NiFe Concentrated Solid-solution Alloys
||Zhe Fan, Xing Wang, Di Chen, Yongqiang Wang, Yuri Osetsky, Hongbin Bei, William Weber, Yanwen Zhang
|On-Site Speaker (Planned)
Helium cavities in irradiated concentrated solid-solution alloys can be tailored by alloying elements, however, how these helium cavities further evolve is rarely investigated. Here, we compared effects of annealing and ion irradiation on helium-implanted Ni40Fe60 and Ni50Co50. After 200 keV He+ implantation at room temperature, smaller helium cavities and “black spot” defects formed in Ni40Fe60 than Ni50Co50. The helium-implanted alloys were further irradiated by 21 MeV Ni7+ ions at 500 oC. After irradiation, helium cavity distribution remained homogeneous in Ni50Co50, but became inhomogeneous in Ni40Fe60 where helium cavity size was the smallest in peak damage region with extended dislocation networks, and helium cavity size was larger outside the region with few dislocations. A similar inhomogenous distribution was also observed in helium-implanted Ni40Fe60 annealed at 500 oC. The underlying mechanisms for cavity evolution are discussed. This work is supported by EDDE, an EFRC funded by U.S. DOE-BES.