Author/Authors :
Nunes، نويسنده , , D. and Mateus، نويسنده , , R. P. Nogueira، نويسنده , , I.D. and Carvalho، نويسنده , , P.A. and Correia، نويسنده , , J.B. and Shohoji، نويسنده , , José A. N. F. Gomes ، نويسنده , , R.B. and Fernandes، نويسنده , , H. and Silva، نويسنده , , C. and Franco، نويسنده , , Maria Janieire N. N. Alves، نويسنده , , E.، نويسنده ,
Abstract :
Commercially pure tungsten and copper wires acting as Langmuir probes to estimate edge parameters of ISTTOK plasma have been investigated for long term hydrogen migration. The microstructure of both materials revealed recrystallization and strong grain growth at the most severely exposed regions. A low number of large bubbles was observed at the most severely exposed regions, whereas a high density of small intergranular bubbles was found at more moderately exposed regions. Bubble distribution, lattice parameter, grain size, Young´s modulus and microhardness were assessed across longitudinal sections of the probes. The results indicate that bubble formation in tungsten and copper first wall components can be expected to occur and strategies for minimization of this retention phenomenon need to be implemented.
