Strain rate and test temperature dependence on the flow properties of La2O3-doped tungsten

TY - JOUR

T1 - Strain rate and test temperature dependence on the flow properties of La2O3-doped tungsten

AU - Uytdenhouwen, Inge

AU - Chaouadi, Rachid

AU - Linke, Jochen

AU - Massaut, Vincent

AU - Van Oost, Guido

N1 - Score = 10

PY - 2008/12/15

Y1 - 2008/12/15

N2 - Tungsten and tungsten alloys are promising metals as protective materials for the armour in future fusion reactors. These metals exhibit the highest melting point, superior thermo-mechanical properties, low erosion and moderate neutron activation properties. The main drawback is their intrinsic brittleness at room temperature and their low recrystallization temperature. During thermal shock events in ITER, tungsten materials will exhibit various crack formations and failure mechanisms. The extensive heat loads on the surface of the material will create high thermal stresses, huge temperature rises and therefore large strain rates in the subsurface layers. This paper deals with the flow properties combining both temperature and strain rate effects of a lanthanum oxide dispersion strengthened tungsten material and the influence of grain orientation on its ductility. Promising results were obtained using a yield strength model based on a thermallyactivated slip process that rationalizes the data.

AB - Tungsten and tungsten alloys are promising metals as protective materials for the armour in future fusion reactors. These metals exhibit the highest melting point, superior thermo-mechanical properties, low erosion and moderate neutron activation properties. The main drawback is their intrinsic brittleness at room temperature and their low recrystallization temperature. During thermal shock events in ITER, tungsten materials will exhibit various crack formations and failure mechanisms. The extensive heat loads on the surface of the material will create high thermal stresses, huge temperature rises and therefore large strain rates in the subsurface layers. This paper deals with the flow properties combining both temperature and strain rate effects of a lanthanum oxide dispersion strengthened tungsten material and the influence of grain orientation on its ductility. Promising results were obtained using a yield strength model based on a thermallyactivated slip process that rationalizes the data.

KW - ITER

KW - plasma facing materials

KW - tungsten

KW - divertor

KW - flow properties

KW - high temperature

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_93149

UR - http://knowledgecentre.sckcen.be/so2/bibref/5440

U2 - 10.4028/3-908454-01-8.319

DO - 10.4028/3-908454-01-8.319

M3 - Article

VL - 59

SP - 319

EP - 325

JO - Advanced Materials Research

JF - Advanced Materials Research

SN - 1022-6680

T2 - 1st EXTREMAT (Materials under extreme environments) conference

Y2 - 2 June 2008 through 4 June 2008

ER -