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Influence of neutron irradiation and ageing on behavior of SAV-1 reactor alloy
Tsay, K.V.,Rofman, O.V.,Kudryashov, V.V.,Yarovchuk, A.V.,Maksimkin, O.P. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10
This study observed the effect of neutron irradiation and ageing on the microstructure, hardness, and corrosion resistance of SAV-1 (Al-Mg-Si) alloy. The investigated material was irradiated with neutrons to fluences of 10<sup>21</sup>-10<sup>26</sup> n/m<sup>2</sup> in the WWR-K research reactor and kept in dry storage. Long-term irradiation led to an increase in hardness of the alloy and a deterioration of pitting corrosion resistance. Post-irradiation ageing for 1 h at 100-300 ℃ resulted in a decrease in microhardness of the irradiated SAV-1. The effect of post-irradiation ageing on pitting corrosion was made clear through the formation of Guinier-Preston zones and secondary precipitates in the Al matrix. Ageing at 250 ℃ corresponded to the development of stable microstructure and the highest corrosion resistance for the irradiated samples. Mg<sub>2</sub>Si, Si, and needle-shaped β" precipitates were formed in SAV-1 alloy that was irradiated with low fluences. β" and clusters of rod-shaped B-type precipitates were observed in highly irradiated samples. The precipitates were similar to those seen in non-irradiated pseudo-binary Al-Mg<sub>2</sub>Si alloys with Si excess.