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Dose dependence of microstructural evolution and mechanical properties of neutron irradiated copper and copper alloys

Abstract

The present investigation of the effects of neutron irradiation on microstructures and mechanical properties of copper alloys is a part of the ITER (International Thermonuclear Experimental Reactor) programme. Tensile specimens of the candidate alloys Cu-Al{sub 2}O{sub 3}, CuCrZr and CuNiBe were irradiated with fission neutrons in the DR-3 reactor at Risoe with a flux of 2.5 x 10{sup 17} n/m{sup 2}s (E > 1 MeV, i.e. a dose rate of {approx}5 x 10{sup -8} dpa/s) to fluences of 5 x 10{sup 22}, 5 x 10{sup 23} and 1 x 10{sup 24} n/m{sup 2} (E > 1 MeV, i.e. displacement doses of 0.01, 0.1 and 0.2 dpa) at 47 deg. C. The Cu-Al{sub 2}O{sub 3} (CuA125) specimens, were irradiated in the as-cold worked state. Tensile properties and Vickers hardness of both irradiated and unirradiated specimens were determined at 22 deg. C. Pre- and post-deformation microstructures of irradiated as well as unirradiated specimens were examined using a transmission electron microscope. The fractured surfaces of tensile tested specimens were investigated in a scanning electron microscope. The results show the following general trend: (a) that the CuNiBe alloy is stronger than CuCrZr as well as Cu Al{sub 2}O{sub 3}, (b) that even relatively low  More>>
Publication Date:
Sep 01, 1995
Product Type:
Technical Report
Report Number:
RISO-R-839(EN)
Reference Number:
SCA: 360106; 700480; PA: AIX-27:043627; EDB-96:093737; NTS-96:018652; SN: 96001602793
Resource Relation:
Other Information: PBD: Sep 1995
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION; COPPER; PHYSICAL RADIATION EFFECTS; COPPER BASE ALLOYS; THERMONUCLEAR REACTOR MATERIALS; DOSE RATES; EMBRITTLEMENT; MICROSTRUCTURE; NEUTRON FLUENCE; RADIATION HARDENING; TRANSMISSION ELECTRON MICROSCOPY; VICKERS HARDNESS; YIELD STRENGTH
OSTI ID:
240309
Research Organizations:
Risoe National Lab., Roskilde (Denmark). Materials Dept.
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE96625502; ISBN 87-550-2107-7; TRN: DK9600066043627
Availability:
INIS; OSTI as DE96625502
Submitting Site:
DKN
Size:
34 p.
Announcement Date:
Jun 25, 1996

Citation Formats

Singh, B N, Edwards, D J, Horsewell, A, and Toft, P. Dose dependence of microstructural evolution and mechanical properties of neutron irradiated copper and copper alloys. Denmark: N. p., 1995. Web.
Singh, B N, Edwards, D J, Horsewell, A, & Toft, P. Dose dependence of microstructural evolution and mechanical properties of neutron irradiated copper and copper alloys. Denmark.
Singh, B N, Edwards, D J, Horsewell, A, and Toft, P. 1995. "Dose dependence of microstructural evolution and mechanical properties of neutron irradiated copper and copper alloys." Denmark.
@misc{etde_240309,
title = {Dose dependence of microstructural evolution and mechanical properties of neutron irradiated copper and copper alloys}
author = {Singh, B N, Edwards, D J, Horsewell, A, and Toft, P}
abstractNote = {The present investigation of the effects of neutron irradiation on microstructures and mechanical properties of copper alloys is a part of the ITER (International Thermonuclear Experimental Reactor) programme. Tensile specimens of the candidate alloys Cu-Al{sub 2}O{sub 3}, CuCrZr and CuNiBe were irradiated with fission neutrons in the DR-3 reactor at Risoe with a flux of 2.5 x 10{sup 17} n/m{sup 2}s (E > 1 MeV, i.e. a dose rate of {approx}5 x 10{sup -8} dpa/s) to fluences of 5 x 10{sup 22}, 5 x 10{sup 23} and 1 x 10{sup 24} n/m{sup 2} (E > 1 MeV, i.e. displacement doses of 0.01, 0.1 and 0.2 dpa) at 47 deg. C. The Cu-Al{sub 2}O{sub 3} (CuA125) specimens, were irradiated in the as-cold worked state. Tensile properties and Vickers hardness of both irradiated and unirradiated specimens were determined at 22 deg. C. Pre- and post-deformation microstructures of irradiated as well as unirradiated specimens were examined using a transmission electron microscope. The fractured surfaces of tensile tested specimens were investigated in a scanning electron microscope. The results show the following general trend: (a) that the CuNiBe alloy is stronger than CuCrZr as well as Cu Al{sub 2}O{sub 3}, (b) that even relatively low dose irradiations cause significant increase in the yield strength, but rather drastic decreases in the uniform elongation of CuCrZr and CuNiBe alloys and that the low dose irradiation of the cold-worked Cu-Al{sub 2}O{sub 3} alloy causes a decrease in the yield strength and an increase in the uniform elongation, at higher doses irradiation hardening occurs. The SEM examinations of the fractured surfaces demonstrate that both unirradiated and irradiated specimens fracture in a ductile manner. The lack of uniform elongation in the irradiated copper alloys may be understood in terms of difficulty in dislocation generation due to pinning of grown-in dislocation by defect clusters (loops) at or around them. (EG) 5 tabs., 18 ills., 13 refs.}
place = {Denmark}
year = {1995}
month = {Sep}
}