Preliminary results of post-irradiation examinations on LiSoR-2 test section

Assessment of the lifetime of the beam window of MEGAPIE target liquid metal container

“…The temperature-increase and the stresses were much higher, which resulted in a crack induced in the irradiation area of the tube. The microstructure in both irradiation areas of the tube and the inner specimen demonstrated well developed dislocation cells which indicated heavy deformation [29]. However, no microcracks were observed in the irradiation area of the inner specimen where the maximum temperature calculated was 600-700°C and the stress varied from 200 MPa to about 500 MPa.…”

Tensile tests and TEM investigations on LiSoR-2 to -4

“…In the material in the irradiation zones of both the TS-tube and the ITS-specimen dislocation cell structure was well developed, which indicated heavy deformation due to thermal fatigue. An oxide layer of a few microns was formed on the surface in the irradiation zone of the ITS-specimen [4]. The surface analysis results of LiSoR-3 are reported elsewhere in the same proceedings [5].…”

“…The detailed information of LiSoR experiments was presented in [2][3][4][5]. Therefore, in this paper only a brief summary is given as listed in Table 1.…”

“…The optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) performed on LiSoR-2 demonstrated that a crack formed in the irradiation zone of the tube which was introduced by thermal fatigue at high temperature caused by an over-focused beam [4]. In the material in the irradiation zones of both the TS-tube and the ITS-specimen dislocation cell structure was well developed, which indicated heavy deformation due to thermal fatigue.…”

Post-irradiation examination on LiSoR 3 experiment

“…The temperature gradient in the irradiation area of the tube induced a maximum shear stress of about 25 MPa and a compression stress of about 150 MPa which are essentially no danger to the material. Therefore, the crack observed in the tube of LiSoR 2 [23] was not formed in LiSoR 3. Moreover, no micro cracks were detected in the irradiation areas of both the tube and the tensile specimen even if the later was stressed at 200 MPa.…”