Dislocation evolution in Fe-10% Cr

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5144817

Horton, L L; Bentley, J

The dislocation microstructure found in the binary ferritic alloy, Fe-10% Cr, has been characterized for damage levels ranging from 0.3 to 100 dpa. The specimens were irradiated at 850/sup 0/K with a ''triple beam'' of HE/sup +/, D/sup +/, and 4 MeV Fe/sup + +/ ions. Transmission electron microscopy revealed that dislocation loops were dominant in the dislocation microstructure from 0.3 to 3 dpa. At 0.3 dpa the loops were round to slightly rectilinear in shape, whereas at higher doses the majority of the loops had a convoluted shape that indicated preferential growth in the <110> directions. Analyses showed that ll of the loops at low doses and the convoluted loops at 3 dpa were near-edge interstitial loops with b = a<100>. At 3 dpa, round interstitial loops with b = a/2<111> were also observed. Network segments with b = a/2<111> were found at the intersection of a<100> and a/2<111> loops. At damage levels greater than 10 dpa, the structure consisted of a coarse distribution of network segments along with a few loops with b = a/2<111>. At 30 and 100 dpa a relatively low dislocation density, < 10/sup 14/ m/sup -2/, was found. The effects of segregation on the observed dislocations and the implications of the observations on the current understanding of dislocation evolution and damage mechanisms in ferritic materials are discussed.

• Research Organization: Oak Ridge National Lab., TN (USA). Metals and Ceramics Div.
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5144817
• Report Number(s): CONF-860605-32; ON: DE87000228
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360106* -- Metals &amp; Alloys-- Radiation Effects
ALLOYS
CHARGED PARTICLES
CHROMIUM ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DAMAGE
DEUTERONS
DISLOCATIONS
ELECTRON MICROSCOPY
HELIUM IONS
IONS
IRON ALLOYS
IRON BASE ALLOYS
IRON IONS
LINE DEFECTS
MICROSCOPY
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SEGREGATION
TRANSMISSION ELECTRON MICROSCOPY