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
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.