Hydrogen behavior near surface regions in Mo and W studied by tritium tracer technique

[摘要] Tritium tracer techniques are applied to observe behavior of hydrogen (tritium (T)) in near surface regions of Mo and W loaded by gaseous absorption (GAS) and a glow discharge (GDC). GDC produces blisters on both Mo and W surfaces and Tritium Auto-RadioGraph (TARG) showed the thickness of blister skins is larger than the escaping depth of T beta-electrons, around 1 mu m. For GAS specimens, T evolution is likely controlled by diffusion giving diffusion coefficients of, D-Mo = 1.5 x 10(-7) exp (-41 kJ/mol/RT) m(2) s(-1) D-w = 4.3 x 10(-9) exp (-38 kJ/mol/RT)m(2) s(-1) at 273-323 K. GDC specimens show much smaller diffusion coefficients with higher activation energies and T release continues very long, suggesting T release from blisters. (C) 2011 Elsevier B.V. All rights reserved.

[发布日期] 2011-10-01

[效力级别]  Proceedings Paper