TY - JOUR
T1 - Effect of irradiation on the microstructure of Nicalon fibers
AU - Hasegawa, A.
AU - Youngblood, G. E.
AU - Jones, R. H.
N1 - Funding Information:
The work was supportedb y the Office of Fusion Energy of the US DOE under contractD E-AC06-76RLO 1830 with Battelle Memorial Institute and JUPITER (Japan-USA Programo f IrradiationT est for Fusion Research) program and authors are grateful to Dr Larry Chariot and Dr D.S. Gelles of with specimenp reparation.
PY - 1996/8
Y1 - 1996/8
N2 - Microstructural analyses were performed by TEM on two types of Nicalon fibers (CG and Hi) after neutron irradiation at nominally 1040°C to a relatively high dose (43 dpa). For comparison, microstructural analyses also were performed on unirradiated fibers that were thermally annealed at 1010°C for a time equivalent to the irradiation exposure time. No grain growth was observed for either type of unirradiated, but thermally annealed Nicalon fibers. However, significant grain growth was observed to have taken place in the irradiated Nicalon-CG fiber, presumably irradiation induced. In contrast, no significant amount of grain growth was observed in the irradiated Hi-Nicalon fibers. Void and other irradiation defect structures were not observed in either fiber. For such extreme irradiation conditions (43 dpa at 1040°C), the Hi-Nicalon fiber exhibits a much higher degree of microstructural stability than Nicalon-CG fiber. Composite SiC/SiC made with Hi-Nicalon promises to also exhibit improved irradiation performance.
AB - Microstructural analyses were performed by TEM on two types of Nicalon fibers (CG and Hi) after neutron irradiation at nominally 1040°C to a relatively high dose (43 dpa). For comparison, microstructural analyses also were performed on unirradiated fibers that were thermally annealed at 1010°C for a time equivalent to the irradiation exposure time. No grain growth was observed for either type of unirradiated, but thermally annealed Nicalon fibers. However, significant grain growth was observed to have taken place in the irradiated Nicalon-CG fiber, presumably irradiation induced. In contrast, no significant amount of grain growth was observed in the irradiated Hi-Nicalon fibers. Void and other irradiation defect structures were not observed in either fiber. For such extreme irradiation conditions (43 dpa at 1040°C), the Hi-Nicalon fiber exhibits a much higher degree of microstructural stability than Nicalon-CG fiber. Composite SiC/SiC made with Hi-Nicalon promises to also exhibit improved irradiation performance.
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U2 - 10.1016/0022-3115(96)00387-X
DO - 10.1016/0022-3115(96)00387-X
M3 - Letter
AN - SCOPUS:0030219514
SN - 0022-3115
VL - 231
SP - 245
EP - 248
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 3
ER -