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Van Renterghem, W.; Iroc, K.; Terentyev, D.; Antusch, S.; Rieth, M.
International journal of refractory metals & hard materials, August 2024, 2024-08-00, Letnik: 122Journal Article
Recent studies addressing the change of mechanical properties after high temperature irradiation of tungsten have reported substantial increase of the ductile to brittle transition temperature as well as increase of the hardness. In this work, we performed microstructural analysis by means of transmission electron microscopy (TEM) on various tungsten grades earlier exposed to high temperature neutron irradiation at 1200 °C up to 1 dpa. The latter corresponds to the expected irradiation temperature on the surface of a tungsten monoblock during the steady state operation in ITER. TEM was applied to five tungsten (W) materials including ITER specification pure W and precipitate strengthened W alloys. The analysis of TEM data coupled with its discussion led to a number of important conclusions regarding the damage induced at 1200 °C neutron irradiation such as: (i) weak effect of recrystallization on the accumulation of the lattice damage; (ii) promising results on the tolerance of damage accumulation in W-Y2O3 grade and (iii) internal oxidation of TiC particles which may contribute to the huge increase of the irradiation induced hardening. •Neutron irradiated advanced tungsten grades were analyzed with transmission electron microscopy.•The dispersed barrier model based on loops and voids alone is insufficient to explain the hardness increase.•Y2O3 doping of tungsten is beneficial for hardening.•Oxidation of TIC may be responsible for increased hardening in W-1%TiC.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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