No abstract

No abstract

No abstract

In this paper the results of experimental irradiation studies on mechanical properties, grain boundary deformation, and substructural formation in nickel specimens irradiated in the temperature region of high-temperature radiation embrittlement (HTRE) appearance are presented. Flat nickel specimens with the work surface 0.3 by 3.0 by 10 mm were electron-irradiated to the energy 224 MeV at 100°C to the dose 1 × 1021 e/cm2 (0.2 dpa). The amount of helium in the irradiated specimens was approximately 2.5 × 10-3 at%. Those specimens that had been irradiated to the dose 2.5 × 1018 e/cm2 had the helium content of approximately 10-5 at%. Some specimens were α-particle irradiated until reaching helium concentration of 10-5 at %. The α-particle energy was 30 MeV, generating about 10-8 dpa of damage. The mechanical tension tests were carried out in vacuum 5.0 × 10.0-5 torr (655 Pa) at a rate of 3.0 × 10-3 s-1.

No abstract