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Title: 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

Abstract

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.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15007746
Report Number(s):
UCRL-JC-152567
Journal ID: ISSN 1478-6435; TRN: US200421%%71
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 85; Journal Issue: 4-7; Conference: 2003 The Metallurgical Society Annual Meeting, San Diego, CA (US), 03/02/2003--03/06/2003; Other Information: PBD: 27 Feb 2003
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; ANNIHILATION; COPPER; DIFFUSION; EMBRITTLEMENT; IRRADIATION; MANGANESE; NEUTRON FLUENCE; NEUTRONS; POSITRONS; PRESSURE VESSELS; SCATTERING; SPECTROSCOPY

Citation Formats

Glade, S C, Wirth, B D, Asoka-Kumar, P, Odette, G R, Sterne, P A, and Howell, R H. 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. United States: N. p., 2003. Web. doi:10.1080/02678370412331320053.
Glade, S C, Wirth, B D, Asoka-Kumar, P, Odette, G R, Sterne, P A, & Howell, R H. 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. United States. https://doi.org/10.1080/02678370412331320053
Glade, S C, Wirth, B D, Asoka-Kumar, P, Odette, G R, Sterne, P A, and Howell, R H. Thu . "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". United States. https://doi.org/10.1080/02678370412331320053. https://www.osti.gov/servlets/purl/15007746.
@article{osti_15007746,
title = {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},
author = {Glade, S C and Wirth, B D and Asoka-Kumar, P and Odette, G R and Sterne, P A and Howell, R H},
abstractNote = {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.},
doi = {10.1080/02678370412331320053},
url = {https://www.osti.gov/biblio/15007746}, journal = {},
issn = {1478-6435},
number = 4-7,
volume = 85,
place = {United States},
year = {2003},
month = {2}
}

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Works referenced in this record:

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