Effect of temperature on microstructures and retention properties in tungsten exposed to D + He + Be mixture plasmas in PISCES.
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| Title: | Effect of temperature on microstructures and retention properties in tungsten exposed to D + He + Be mixture plasmas in PISCES. |
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| Authors: | Iijima, N.1 s139101@matsu.shimane-u.ac.jp, Miyamoto, M.1 miyamoto@riko.shimane-u.ac.jp, Nishijima, D.2, Baldwin, M.J.2, Doerner, R.P.2, Ueda, Y.3, Sagara, A.4, Höschen, T.5 |
| Source: | Journal of Nuclear Materials. Aug2015, Vol. 463, p979-982. 4p. |
| Subjects: | Microstructure, Tungsten, Thermal stresses, Thermal properties, Helium |
| Abstract: | The influence of temperature on microstructures and D retention properties in tungsten exposed to D + He + Be mixture plasmas is investigated. For the low temperature exposure case at 573 K, the Be seeding to D + He mixture plasmas results in the suppression of high density He nano-bubbles, which are distinctive internal defects observed in He irradiated/exposed metals. In contrast, fine and high-density He bubbles appear for W exposed to D + He + Be mixture plasmas at higher temperatures of >773 K. TDS measurements also show that the influence of Be seeding to D + He mixture plasmas, which counteracts the significant reduction in D retention, becomes weak with increasing temperature. From XPS analyses, it is considered that Be 2 W is formed by interdiffusion and solid-state-reaction at the high temperature exposure case, and the influence of the metallic Be on surface properties gradually disappears with increasing temperature. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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