Formation of the Ni31Si12 phase induced by the irradiation of nickel ions on the eutectic, α-Ni-Ni3Si-monoclinic, with a 380 dpa dose

This investigation has been developed to determine which microstructural changes on the eutectic α-Ni-Ni 3 Si - monoclinic , if any exist, result from the irradiation with Ni-ions. SRIM program has been used to simulate the interaction of the irradiation with both α-Ni and Ni 3 Si - monoclinic phase...

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Published in:Radiation effects and defects in solids 2020-09, Vol.175 (9-10), p.925-937
Main Authors: Camacho-Olguín, Carlos Alberto, Garcia-Borquez, Arturo, Paz del Angel, Vicente, Fuente, J. Ascencion Montoya-De La, González-Rodríguez, Carlos Alberto, Ramos-Tercero, Luz María, Cruz-Mejia, Hector, Rodriguez-Diaz, Roberto A.
Format: Article
Language:English
Subjects:
and irradiation
Chemical composition
Crystallography
Eutectics
Hexagonal phase
Intermetallic phases
Ion beams
Ion irradiation
Ions
Irradiation
Monoclinic lattice
Nickel
phase transformations
Radiation
Radiation effects
Reinforced reaction injection molding
Structural stability
X-ray diffraction
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Summary:This investigation has been developed to determine which microstructural changes on the eutectic α-Ni-Ni 3 Si - monoclinic , if any exist, result from the irradiation with Ni-ions. SRIM program has been used to simulate the interaction of the irradiation with both α-Ni and Ni 3 Si - monoclinic phases. X-ray diffraction studies of irradiated and non-irradiated regions have allowed us to establish that the ion irradiation promote the formation of the Ni 31 Si 12-hexagonal intermetallic phase with hexagonal structure. An analysis of the irradiated region by High Resolution Transmission Electron Microscopy (HRTEM) confirmed the presence of the Ni 31 Si 12-hexagonal intermetallic phase, establishing at the same time, its crystallographic relationship with the matrix. Evidently, radiation-induced segregation could cause significant changes in the chemical composition of concentrated alloys. This experimental discovery, in particular, is significant because the formation of the Ni 31 Si 12-hexagonal phase under irradiation conditions had never been mentioned before. Nonetheless, the formation of the Ni 31 Si 12-hexagonal intermetallic phase represents an advance in the field of the microstructural modification by ion beam irradiation, and as a consequence of this finding, it is possible to establish that the structural stability of the eutectic form of the α-Ni-Ni 3 Si -monoclinic phases under severe irradiation conditions, is questionable.
ISSN:1042-0150
1029-4953
DOI:10.1080/10420150.2020.1793338