The effect of brazing cycle simulation on radiation embrittlement of pH copper alloys irradiated in SM-2 reactor up to 5 dpa

Citation
Sa. Fabritsiev et As. Pokrovsky, The effect of brazing cycle simulation on radiation embrittlement of pH copper alloys irradiated in SM-2 reactor up to 5 dpa, PLASMA D OP, 8(1), 1999, pp. 1-14
Citations number
8
Categorie Soggetti
Nuclear Emgineering
Journal title
PLASMA DEVICES AND OPERATIONS
ISSN journal
10519998 → ACNP
Volume
8
Issue
1
Year of publication
1999
Pages
1 - 14
Database
ISI
SICI code
1051-9998(1999)8:1<1:TEOBCS>2.0.ZU;2-U
Abstract
The paper presents the results of investigation into the radiation resistan ce of Precipitation hardened (PH) copper alloys of Cu-Cr-Zr and Cu-2Be type irradiated up to 5 dpa in the SM-2 reactor at T-irr = 120 degrees C and 30 0 degrees C. The PH copper alloys were irradiated in two states: 1. optimized state - quenching at 900 degrees C, 4h ageing at 480 degrees C ; 2. after simulation of brazing cycle at 850 degrees C - Ih, dow cooling. The low-temperature embrittlement causes the Cu-Cr-Zr alloy to strengthen a nd embrittle. Annealed samples of these alloys are characterized by a lower yield strength and a high plasticity in the irradiated state. The Cu-2Be a hoy after low-temperature irradiation is brittle both in the optimized stat e and after annealing. Irradiation at 300 degrees C results in plastification and partial softenin g of the alloys in both states. The conclusion is made that after thermal brazing cycle Cu-Cr-Zr type PH co pper alloys have a satisfactory radiation resistance in the irradiation tem perature range of 120-300 degrees C up to irradiation doses of 5 dpa.