TY - JOUR
T1 - Atom probe study of irradiation-enhanced α precipitation in neutron-irradiated Fe-Cr model alloys
AU - Chen, Wei Ying
AU - Miao, Yinbin
AU - Wu, Yaqiao
AU - Tomchik, Carolyn A.
AU - Mo, Kun
AU - Gan, Jian
AU - Okuniewski, Maria A.
AU - Maloy, Stuart A.
AU - Stubbins, James F.
N1 - Publisher Copyright:
© Published by Elsevier B.V.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - Atom probe tomography (APT) was performed to study the effects of Cr concentrations, irradiation doses and irradiation temperatures on α phase formation in Fe-Cr model alloys (10-16 at.%) irradiated at 300 and 450 °C to 0.01, 0.1 and 1 dpa. For 1 dpa specimens, α precipitates with an average radius of 1.0-1.3 nm were observed. The precipitate density varied significantly from 1.1 × 1023 to 2.7 × 1024 1/m3, depending on Cr concentrations and irradiation temperatures. The volume fraction of α phase in 1 dpa specimens qualitatively agreed with the phase diagram prediction. For 0.01 dpa and 0.1 dpa, frequency distribution analysis detected slight Cr segregation in high-Cr specimens, but not in Fe-10Cr specimens. Proximity histogram analysis showed that the radial Cr concentration was highest at the center of α precipitates. For most precipitates, the Cr contents were significantly lower than that predicted by the phase diagram. The Cr concentration at precipitate center increased with increasing precipitate size.
AB - Atom probe tomography (APT) was performed to study the effects of Cr concentrations, irradiation doses and irradiation temperatures on α phase formation in Fe-Cr model alloys (10-16 at.%) irradiated at 300 and 450 °C to 0.01, 0.1 and 1 dpa. For 1 dpa specimens, α precipitates with an average radius of 1.0-1.3 nm were observed. The precipitate density varied significantly from 1.1 × 1023 to 2.7 × 1024 1/m3, depending on Cr concentrations and irradiation temperatures. The volume fraction of α phase in 1 dpa specimens qualitatively agreed with the phase diagram prediction. For 0.01 dpa and 0.1 dpa, frequency distribution analysis detected slight Cr segregation in high-Cr specimens, but not in Fe-10Cr specimens. Proximity histogram analysis showed that the radial Cr concentration was highest at the center of α precipitates. For most precipitates, the Cr contents were significantly lower than that predicted by the phase diagram. The Cr concentration at precipitate center increased with increasing precipitate size.
UR - http://www.scopus.com/inward/record.url?scp=84927944236&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2015.04.005
DO - 10.1016/j.jnucmat.2015.04.005
M3 - Article
AN - SCOPUS:84927944236
SN - 0022-3115
VL - 462
SP - 242
EP - 249
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -