TY - JOUR
T1 - Experimental determination of creep properties of Beryllium irradiated to relevant fusion power reactor doses
AU - Scibetta, Marc
AU - Pellettieri, Antonio
AU - Sannen, Leo
A2 - Lucon, Enrico
N1 - Score = 10
PY - 2007/3
Y1 - 2007/3
N2 - A dead weight machine has been developed to measure creep in irradiated beryllium relevant to fusion power reactors.
Due to the external compressive load, the material will creep and the specimen will shrink. However, the specimen also
swells due to the combined effect of internal pressure in helium bubbles and creep. One of the major challenges is to
unmask swelling and derive intrinsic creep properties. This has been achieved through appropriate pre-annealing experiments.
Creep has been measured on irradiated and unirradiated specimens. The temperature and stress dependence is characterized
and modeled using the product of an Arrhenius’ law for the temperature dependence and a power law for the
stress dependence. Irradiation increases the sensitivity to creep but the irradiation effects can be rationalized by taking into
account the irradiation-induced porosity. Experimental evidence supports dislocation climb by vacancy absorption to be
the most plausible intrinsic creep mechanism.
AB - A dead weight machine has been developed to measure creep in irradiated beryllium relevant to fusion power reactors.
Due to the external compressive load, the material will creep and the specimen will shrink. However, the specimen also
swells due to the combined effect of internal pressure in helium bubbles and creep. One of the major challenges is to
unmask swelling and derive intrinsic creep properties. This has been achieved through appropriate pre-annealing experiments.
Creep has been measured on irradiated and unirradiated specimens. The temperature and stress dependence is characterized
and modeled using the product of an Arrhenius’ law for the temperature dependence and a power law for the
stress dependence. Irradiation increases the sensitivity to creep but the irradiation effects can be rationalized by taking into
account the irradiation-induced porosity. Experimental evidence supports dislocation climb by vacancy absorption to be
the most plausible intrinsic creep mechanism.
KW - fusion
KW - beryllium
KW - creep
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_83874
UR - http://knowledgecentre.sckcen.be/so2/bibref/4522
U2 - 10.1016/j.jnucmat.2007.03.177
DO - 10.1016/j.jnucmat.2007.03.177
M3 - Article
SN - 0022-3115
VL - 367-370
SP - 1063
EP - 1068
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - Part 2
T2 - ICFRM12 2005 - 12th International Conference on Fusion Reactor Materials - US
Y2 - 4 December 2005 through 9 December 2005
ER -