TY - JOUR
T1 - Nanoscale surface morphology of tungsten materials induced by Be-seeded D-He plasma exposure
AU - Tokunaga, K.
AU - Baldwin, M. J.
AU - Doerner, R. P.
AU - Nishijima, D.
AU - Kurishita, H.
AU - Fujiwara, T.
AU - Araki, K.
AU - Miyamoto, Y.
AU - Ohno, N.
AU - Ueda, Y.
N1 - Funding Information:
This work is supported by Japan–US Fusion Cooperation Program (TITAN).
PY - 2011/10/1
Y1 - 2011/10/1
N2 - Ultra-fine grain W-(0.5, 1.5)wt%TiC alloys and stress relieved powder metallurgy W have been exposed to D-He mixed plasmas, some with added Be. The fixed exposure conditions are ion energy 60 eV and flux 3 to 6 × 10 22/m2 s. Sample temperature is 1123 K and exposure times scanned 1000-11,000 s. Typical He/D ion is 0.2 and Be is 0.2% of the plasma. A remarkable change of the tungsten surfaces results from the plasma exposures. Formation of a nano-structured layer on the exposure surfaces is observed and believed to be related to He bubble formation. In addition, the growth rate of the nano-structured layer depends on the microstructure of the samples. In the case of a D-He plasma with Be, at 60 eV, plasma sputters away most of Be deposits with little effect on the He induced nano-structured layer formation.
AB - Ultra-fine grain W-(0.5, 1.5)wt%TiC alloys and stress relieved powder metallurgy W have been exposed to D-He mixed plasmas, some with added Be. The fixed exposure conditions are ion energy 60 eV and flux 3 to 6 × 10 22/m2 s. Sample temperature is 1123 K and exposure times scanned 1000-11,000 s. Typical He/D ion is 0.2 and Be is 0.2% of the plasma. A remarkable change of the tungsten surfaces results from the plasma exposures. Formation of a nano-structured layer on the exposure surfaces is observed and believed to be related to He bubble formation. In addition, the growth rate of the nano-structured layer depends on the microstructure of the samples. In the case of a D-He plasma with Be, at 60 eV, plasma sputters away most of Be deposits with little effect on the He induced nano-structured layer formation.
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U2 - 10.1016/j.jnucmat.2011.01.078
DO - 10.1016/j.jnucmat.2011.01.078
M3 - Article
AN - SCOPUS:80053613140
VL - 417
SP - 528
EP - 532
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - 1-3
ER -