Experimental determination of creep properties of Beryllium irradiated to relevant fusion power reactor doses

Marc Scibetta; Antonio Pellettieri; Leo Sannen; Enrico Lucon

doi:10.1016/j.jnucmat.2007.03.177

Experimental determination of creep properties of Beryllium irradiated to relevant fusion power reactor doses

Marc Scibetta
, Antonio Pellettieri
, Leo Sannen
, Enrico Lucon

Research output › peer-review

Abstract

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.

Original language	English
Pages (from-to)	1063-1068
Journal	Journal of Nuclear Materials
Volume	367-370
Issue number	Part 2
DOIs	https://doi.org/10.1016/j.jnucmat.2007.03.177
State	Published - Mar 2007
Event	ICFRM12 2005 - 12th International Conference on Fusion Reactor Materials - US - UCSB, Santa Barbara Duration: 4 Dec 2005 → 9 Dec 2005

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10.1016/j.jnucmat.2007.03.177License: Other

Cite this

@article{bc03ad9fd1bc498d9d66c628fc555921,

title = "Experimental determination of creep properties of Beryllium irradiated to relevant fusion power reactor doses",

abstract = "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{\textquoteright} 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.",

keywords = "fusion, beryllium, creep",

author = "Marc Scibetta and Antonio Pellettieri and Leo Sannen and Enrico Lucon",

note = "Score = 10; ICFRM12 2005 - 12th International Conference on Fusion Reactor Materials - US ; Conference date: 04-12-2005 Through 09-12-2005",

year = "2007",

month = mar,

doi = "10.1016/j.jnucmat.2007.03.177",

language = "English",

volume = "367-370",

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journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier B.V.",

number = "Part 2",

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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

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UR - http://knowledgecentre.sckcen.be/so2/bibref/4522

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DO - 10.1016/j.jnucmat.2007.03.177

M3 - Article

SN - 0022-3115

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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 -