TY - JOUR
T1 - One-dimensional glide motion of "naked" nanoscale 1/2<111> prismatic dislocation loops in iron
AU - Arakawa, Kazuto
AU - Amino, Takafumi
AU - Isshiki, Minoru
AU - Mimura, Kouji
AU - Uchikoshi, Masahito
AU - Mori, Hirotaro
N1 - Publisher Copyright:
© 2014 ISIJ.
PY - 2014
Y1 - 2014
N2 - One-dimensional (1D) glide diffusion of interstitial-type prismatic dislocation loops is believed to play key roles in microstructural evolutions within nuclear-fusion and fission materials upon energetic particle irradiation. In the present study, using in-situ transmission electron microscopy, we have examined behaviors of nanoscale 1/2<111> loops in high-purity α-iron at "low temperatures" ranging from 15 to 290 K, under zero external stress. We observed 1D intermittent and fast motion of loops above approximately 100 K, which was significantly different from the 1D continuous and viscous motion observed at "high temperatures" above approximately 450 K. The estimated lower-limit values of diffusivities for "low temperatures" were considerably higher than the values obtained through the extrapolation of the temperature dependence of the diffusivities at "high temperatures." These results support the idea that strong obstacles for loop motion are formed by heating of the specimens to "high temperatures" after the introduction of loops.
AB - One-dimensional (1D) glide diffusion of interstitial-type prismatic dislocation loops is believed to play key roles in microstructural evolutions within nuclear-fusion and fission materials upon energetic particle irradiation. In the present study, using in-situ transmission electron microscopy, we have examined behaviors of nanoscale 1/2<111> loops in high-purity α-iron at "low temperatures" ranging from 15 to 290 K, under zero external stress. We observed 1D intermittent and fast motion of loops above approximately 100 K, which was significantly different from the 1D continuous and viscous motion observed at "high temperatures" above approximately 450 K. The estimated lower-limit values of diffusivities for "low temperatures" were considerably higher than the values obtained through the extrapolation of the temperature dependence of the diffusivities at "high temperatures." These results support the idea that strong obstacles for loop motion are formed by heating of the specimens to "high temperatures" after the introduction of loops.
KW - Diffusion
KW - High-purity iron
KW - One-dimensional glide motion
KW - Prismatic dislocation loop
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=84908472197&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84908472197&partnerID=8YFLogxK
U2 - 10.2355/isijinternational.54.2421
DO - 10.2355/isijinternational.54.2421
M3 - Article
AN - SCOPUS:84908472197
VL - 54
SP - 2421
EP - 2424
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 10
ER -