TY - JOUR
T1 - Direct observation of solute segregation to voids in a fast-neutron irradiated Mo/1.0 at% Ti Alloy
AU - Wagner, Alfred
AU - Seidman, David N.
N1 - Funding Information:
* This work was supported by the US Department of Energy under Contract No. EY-764-3158. *OOO.A ddi-tional support was received from the National Science Foundation through the use of the technical facilities of the Materials Science Center at Cornell University. ** Now at BelI Laboratories, 600 Mountain Avenue, Murray Hill, NJ 07974, USA.
PY - 1979/8
Y1 - 1979/8
N2 - The atom-probe field-ion microscope (FIM) has been employed to study segregation effects, to voids, in a Mo/1.0 at% Ti alloy specimen; this specimen had been irradiated with fast neutrons at ~700° C, to a fluence of ~1 × 1022n/cm2 (E > 1 MeV), in the row 7 midplane position of EBR-II. It had been shown previously, by several other research groups, that this alloy exhibits an enhanced swelling relative to pure Mo under fast-neutron irradiation. The results of the present work, on this alloy, indicated that: (1) titanium does not segregate significantly to voids; (2) the concentration of titanium in solid solution and the spatial distribution of titanium was not affected significantly by the irradiation at 700°C; (3) carbon was not detected in solid solution in either the irradiated or unirradiated specimens; (4) the preceding two results indicated that largescale resolution of TiC or Mo2C precipitates had not occurred as a result of the irradiation; and (5) segregation of carbon to a void was detected. The small amount of carbon segregation which had been detected may have been sufficient to enhance the nucleation rate and/or change the sink properties of a void and thus affect the void growth-rate.
AB - The atom-probe field-ion microscope (FIM) has been employed to study segregation effects, to voids, in a Mo/1.0 at% Ti alloy specimen; this specimen had been irradiated with fast neutrons at ~700° C, to a fluence of ~1 × 1022n/cm2 (E > 1 MeV), in the row 7 midplane position of EBR-II. It had been shown previously, by several other research groups, that this alloy exhibits an enhanced swelling relative to pure Mo under fast-neutron irradiation. The results of the present work, on this alloy, indicated that: (1) titanium does not segregate significantly to voids; (2) the concentration of titanium in solid solution and the spatial distribution of titanium was not affected significantly by the irradiation at 700°C; (3) carbon was not detected in solid solution in either the irradiated or unirradiated specimens; (4) the preceding two results indicated that largescale resolution of TiC or Mo2C precipitates had not occurred as a result of the irradiation; and (5) segregation of carbon to a void was detected. The small amount of carbon segregation which had been detected may have been sufficient to enhance the nucleation rate and/or change the sink properties of a void and thus affect the void growth-rate.
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U2 - 10.1016/0022-3115(79)90591-9
DO - 10.1016/0022-3115(79)90591-9
M3 - Article
AN - SCOPUS:0018503504
SN - 0022-3115
VL - 83
SP - 48
EP - 56
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1
ER -