Pure austenitic Fe-36%Ni, and the same alloy doped with 0.1%P, were irradiated with 5MeV electrons at 270 to 573K. By using positron annihilation and residual resistivity methods, it was shown that - at an irradiation temperature of 270K - vacancies were mobile in both alloys and formed vacancy clusters. In the case of the Fe-36Ni-0.1P alloy, the vacancy clusters were decorated with P atoms. The decoration effect was not observed after irradiation at 423K. At an irradiation temperature of 573K, the addition of P resulted in the suppression of vacancy supersaturation. It was concluded that, at high irradiation temperatures, the suppression of vacancy supersaturation occurred due to interstitial-P interactions.

Effects of Phosphorus on Defect Accumulation and Annealing in Electron-Irradiated Fe-Ni Austenitic Alloys. V.L.Arbuzov, A.P.Druzhkov, S.E.Danilov: Journal of Nuclear Materials, 2001, 295[2-3], 273-80