Evolution of B2 and laves phases in a ferritic steel under Fe2+ ion irradiation at 475 °C
作者： Li He , Lizhen Tan , Ying Yang , Kumar Sridharan
DOI: 10.1016/J.JNUCMAT.2019.07.024
关键词: Analytical chemistry 、 Laves phase 、 Intermetallic 、 Dislocation 、 Energy-dispersive X-ray spectroscopy 、 Phase (matter) 、 Irradiation 、 Materials science 、 Microstructure 、 Transmission electron microscopy
摘要: Abstract Microstructural evolution in a novel ferritic steel (Fe–12Cr–3W–3Ni–3Al–1Nb, wt.%) computationally designed to contain B2 and Laves phases after 4 MeV Fe2+ ion irradiation up 220 dpa at 475 °C was characterized using transmission electron microscopy conjunction with x-ray energy dispersive spectroscopy. The matrix phase exhibited dislocation loops tangled dislocations, but our focus on stability of two types intermetallic precipitates. B2–NiAl precipitates ∼13 nm size remained crystalline appeared have slightly lower Al concentration irradiation. phase, (Fe,Cr)2(Nb,W), were present ranges: coarse micron-scale which amorphized slight composition change doses above ∼ 30 dpa, while the finer precipitate particles ∼ 100 nm partially disintegrated noticeable above ∼ 70 dpa. Meanwhile, many Nb/Cr-enriched particles ∼8 nm formed within few hundreds nanometers from particles. understanding would help design advanced steels engineer microstructures that are stable against high doses, retaining good temperature strength.
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