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Title: Structural and chemical evolution in neutron irradiated and helium-injected ferritic ODS PM2000 alloy

Abstract

An investigation of the influence of helium on damage evolution under neutron irradiation of an 11 at% Al, 19 at% Cr ODS ferritic PM2000 alloy was carried out in the High Flux Isotope Reactor (HFIR) using a novel in situ helium injection (ISHI) technique. Helium was injected into adjacent TEM discs from thermal neutron 59Ni(nth, 59Ni(nth,α) reactions in a thin NiAl layer. The PM2000 undergoes concurrent displacement damage from the high-energy neutrons. The ISHI technique allows direct comparisons of regions with and without high concentrations of helium since only the side coated with the NiAl experiences helium injection. The corresponding microstructural and microchemical evolutions were characterized using both conventional and scanning transmission electron microscopy techniques. The evolutions observed include formation of dislocation loops and associated helium bubbles, precipitation of a variety of phases, amorphization of the Al2YO3 oxides (which also variously contained internal voids), and several manifestations of solute segregation. Notably, high concentrations of helium had a significant effect on many of these diverse phenomena. These results on PM2000 are compared and contrasted to the evolution of so-called nanostructured ferritic alloys (NFA).

Authors:
ORCiD logo; ORCiD logo; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1347849
Report Number(s):
PNNL-SA-122149
Journal ID: ISSN 0022-3115; 49137; AT2030110
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 484
Country of Publication:
United States
Language:
English
Subject:
Dual Helium and Neutron Irradiation; Ferritic ODS Alloy; Transmission electron microscopy; Environmental Molecular Sciences Laboratory

Citation Formats

Jung, Hee Joon, Edwards, Dan J., Kurtz, Richard J., Yamamoto, Takuya, Wu, Yuan, and Odette, G. Robert. Structural and chemical evolution in neutron irradiated and helium-injected ferritic ODS PM2000 alloy. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2016.11.022.
Jung, Hee Joon, Edwards, Dan J., Kurtz, Richard J., Yamamoto, Takuya, Wu, Yuan, & Odette, G. Robert. Structural and chemical evolution in neutron irradiated and helium-injected ferritic ODS PM2000 alloy. United States. doi:10.1016/j.jnucmat.2016.11.022.
Jung, Hee Joon, Edwards, Dan J., Kurtz, Richard J., Yamamoto, Takuya, Wu, Yuan, and Odette, G. Robert. Wed . "Structural and chemical evolution in neutron irradiated and helium-injected ferritic ODS PM2000 alloy". United States. doi:10.1016/j.jnucmat.2016.11.022.
@article{osti_1347849,
title = {Structural and chemical evolution in neutron irradiated and helium-injected ferritic ODS PM2000 alloy},
author = {Jung, Hee Joon and Edwards, Dan J. and Kurtz, Richard J. and Yamamoto, Takuya and Wu, Yuan and Odette, G. Robert},
abstractNote = {An investigation of the influence of helium on damage evolution under neutron irradiation of an 11 at% Al, 19 at% Cr ODS ferritic PM2000 alloy was carried out in the High Flux Isotope Reactor (HFIR) using a novel in situ helium injection (ISHI) technique. Helium was injected into adjacent TEM discs from thermal neutron 59Ni(nth, 59Ni(nth,α) reactions in a thin NiAl layer. The PM2000 undergoes concurrent displacement damage from the high-energy neutrons. The ISHI technique allows direct comparisons of regions with and without high concentrations of helium since only the side coated with the NiAl experiences helium injection. The corresponding microstructural and microchemical evolutions were characterized using both conventional and scanning transmission electron microscopy techniques. The evolutions observed include formation of dislocation loops and associated helium bubbles, precipitation of a variety of phases, amorphization of the Al2YO3 oxides (which also variously contained internal voids), and several manifestations of solute segregation. Notably, high concentrations of helium had a significant effect on many of these diverse phenomena. These results on PM2000 are compared and contrasted to the evolution of so-called nanostructured ferritic alloys (NFA).},
doi = {10.1016/j.jnucmat.2016.11.022},
journal = {Journal of Nuclear Materials},
number = ,
volume = 484,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}