TY - JOUR
T1 - Microstructural evolution of Fe-Cr-W model alloys during Fe+ ion irradiation
AU - Wakai, Eiichi
AU - Hishinuma, Akimichi
AU - Abe, Hiroaki
AU - Takaki, Seiichi
AU - Abiko, Kenji
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2000/9
Y1 - 2000/9
N2 - The effect of radiation on microstructural evolution and phase transformation in Fe-50Cr-5W and Fe-50Cr-8W model alloys was examined. The 300 keV Fe+ ion irradiation was performed at temperatures of 550, 600, 670, and 700 °C at a rate of 1.4×1018 ions/m2 s for (1.2-1.8)×103 s in a transmission electron microscope (TEM). The damage peak level corresponded to about 190-285 dpa. The peak depth positions of damage and Fe+ ion were about 60 and 100 nm, respectively. Dislocation loops were observed in the Fe-50Cr-W alloys up to 700 °C. A Laves phase of tens of nanometers in size was formed in the Fe-50Cr-W alloys within a few minutes, but the formation of Laves phase decreased with increasing irradiation temperature. Sigma-phase grains of about 50-100 nm in size and micro-crystallines were observed in the alloys irradiated at 670 and 700 °C. However, in the specimen aged at 700 °C for 1000 h and the one aged at 700 °C for 10 h after 80% CW, only the Laves phase had formed and no sigma phase was observed in the Fe-50Cr-W alloys. These results indicate that Fe+ ion irradiation can strongly influence the Laves and sigma phase transformations, and microstructural development, in the Fe-50Cr-W alloys.
AB - The effect of radiation on microstructural evolution and phase transformation in Fe-50Cr-5W and Fe-50Cr-8W model alloys was examined. The 300 keV Fe+ ion irradiation was performed at temperatures of 550, 600, 670, and 700 °C at a rate of 1.4×1018 ions/m2 s for (1.2-1.8)×103 s in a transmission electron microscope (TEM). The damage peak level corresponded to about 190-285 dpa. The peak depth positions of damage and Fe+ ion were about 60 and 100 nm, respectively. Dislocation loops were observed in the Fe-50Cr-W alloys up to 700 °C. A Laves phase of tens of nanometers in size was formed in the Fe-50Cr-W alloys within a few minutes, but the formation of Laves phase decreased with increasing irradiation temperature. Sigma-phase grains of about 50-100 nm in size and micro-crystallines were observed in the alloys irradiated at 670 and 700 °C. However, in the specimen aged at 700 °C for 1000 h and the one aged at 700 °C for 10 h after 80% CW, only the Laves phase had formed and no sigma phase was observed in the Fe-50Cr-W alloys. These results indicate that Fe+ ion irradiation can strongly influence the Laves and sigma phase transformations, and microstructural development, in the Fe-50Cr-W alloys.
UR - http://www.scopus.com/inward/record.url?scp=0034268699&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034268699&partnerID=8YFLogxK
U2 - 10.2320/matertrans1989.41.1176
DO - 10.2320/matertrans1989.41.1176
M3 - Article
AN - SCOPUS:0034268699
VL - 41
SP - 1176
EP - 1179
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 9
ER -