Positron Annihilation Spectroscopy and Small Angle Neutron Scattering Characterization of the Effect of Mn on the Nanostructural Features formed in Irradiated Fe-Cu-Mn Alloys

Glade, S C; Wirth, B D; Asoka-Kumar, P; Odette, G R; Sterne, P A; Howell, R H

doi:10.1080/02678370412331320053

Positron Annihilation Spectroscopy and Small Angle Neutron Scattering Characterization of the Effect of Mn on the Nanostructural Features formed in Irradiated Fe-Cu-Mn Alloys

Conference · Thu Feb 27 04:00:00 EST 2003

DOI:https://doi.org/10.1080/02678370412331320053· OSTI ID:15007746

Glade, S C; Wirth, B D; Asoka-Kumar, P; Odette, G R; Sterne, P A; Howell, R H

The size, number density and composition of the nanometer defects responsible for the hardening and embrittlement in irradiated Fe-0.9wt.% Cu and Fe-0.9wt.% Cu-1.0wt% Mn model reactor pressure vessel alloys were measured using small angle neutron scattering and positron annihilation spectroscopy. These alloys were irradiated at 290 C to relatively low neutron fluences (E > 1 MeV, 6.0 x 10{sup 20} to 4.0 x 10{sup 21} n/m{sup 2}) in order to study the effect of manganese on the nucleation and growth of copper rich precipitates and secondary defect features. Copper rich precipitates were present in both alloys following irradiation. The Fe-Cu-Mn alloy had smaller precipitates and a larger number density of precipitates, suggesting Mn segregation at the iron matrix-precipitate interface which reduces the interfacial energy and in turn the driving force for coarsening. Mn also retards the precipitation kinetics and inhibits large vacancy cluster formation, suggesting a strong Mn-vacancy interaction which reduces radiation enhanced diffusion.

Research Organization:: Lawrence Livermore National Lab., CA (US)

Sponsoring Organization:: US Department of Energy (US)

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 15007746

Report Number(s):: UCRL-JC-152567

Country of Publication:: United States

Language:: English

References (13)

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36 MATERIALS SCIENCE
ALLOYS
ANNIHILATION
COPPER
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EMBRITTLEMENT
IRRADIATION
MANGANESE
NEUTRON FLUENCE
NEUTRONS
POSITRONS
PRESSURE VESSELS
SCATTERING
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Positron Annihilation Spectroscopy and Small Angle Neutron Scattering Characterization of the Effect of Mn on the Nanostructural Features formed in Irradiated Fe-Cu-Mn Alloys

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