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001     280447
005     20240711113727.0
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024 7 _ |a 1873-7196
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100 1 _ |a Spilker, Benjamin
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245 _ _ |a Impact of the surface quality on the thermal shock performance of beryllium armor tiles for first wall applications
260 _ _ |a New York, NY [u.a.]
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520 _ _ |a Beryllium will be applied as first wall armor material in ITER. The armor has to sustain high steady state and transient power fluxes. For transient events like edge localized modes, these transient power fluxes rise up to 1.0 GW m−2 with a duration of 0.5–0.75 ms in the divertor region and a significant fraction of this power flux is deposited on the first wall as well. In the present work, the reference beryllium grade for the ITER first wall application S-65 was prepared with various surface conditions and subjected to transient power fluxes (thermal shocks) with ITER relevant loading parameters. After 1000 thermal shocks, a crucial destruction of the entire loaded area was observed and linked to the stress accelerated grain boundary oxidation (SAGBO)/dynamic embrittlement (DE) effect. Furthermore, the study revealed that the majority of the thermally induced cracks formed between 1 and 10 pulses and then grew wider and deeper with increasing pulse number. The surface quality did not influence the cracking behavior of beryllium in any detectable way. However, the polished surface demonstrated the highest resistance against the observed crucial destruction mechanism.
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700 1 _ |a Linke, Jochen
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700 1 _ |a Pintsuk, Gerald
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700 1 _ |a Wirtz, Marius
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