Radiation induced microstructures in ODS 316 austenitic steel under dual-beam ions

H.K. Zhang Z.W. Yao Z.J. Zhou M. Wang 1 O. Kaitasov 2 M.R. Daymond
CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : An ODS 316 austenitic steel was fabricated and irradiated using dual ion beams (1 MeV Kr+ and 15 keV He+) with in-situ transmission electron microscope (TEM) observation. Cavities formed at a low dose in samples irradiated with simultaneous helium injection. It was found that Y-Ti-O particles acted as strong traps for cavity formation at low doses. Helium exhibited a significant effect on cavity development. Cavities were also preferentially nucleated along grain boundaries, phase boundaries and twin boundaries. Irradiation induced lattice defects mainly consisted of small 1/2 < 110 > perfect loops and 1/3 < 111 > Frank loops. An increment of helium injection rate also greatly enhanced the Frank loop growth. Small (<10 nm) Y-Ti-O particles were found to be unstable after irradiation to high doses. M23C6 precipitates were observed after irradiation and helium might play a major role in their formation. (C) 2014 Elsevier B.V. All rights reserved.
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H.K. Zhang, Z.W. Yao, Z.J. Zhou, M. Wang, O. Kaitasov, et al.. Radiation induced microstructures in ODS 316 austenitic steel under dual-beam ions. Proceedings of the 16th International Conference on Fusion Reactor Materials (ICFRM-16), Oct 2013, BEIJING, China. pp.242-247, ⟨10.1016/j.jnucmat.2014.06.024⟩. ⟨in2p3-01134287⟩



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