Embrittlement induced by the synergistic effects of radiation damage and helium in structural steels
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The irradiation of metals by energetic particles causes significant degradation of the mechanical properties(1,2), most notably an increased yield stress and decreased ductility, often accompanied by plastic flow localization. Such effects limit the lifeti ...
Transient creep experiments have been performed on poly-quasicrystalline specimens of the icosahedral Al-Cu-Fe phase. Three temperatures (870, 960 and 1000 K) have been selected in the ductile regime for creep stresses that range between 30 and 320 MPa. In ...
Titanium alloys have been identified as candidate structural materials for the first wall, the blanket and the magnetic coil structures of fusion reactors. Titanium alloys are interesting materials because of their high specific strength and low elastic mo ...
Irradiation-induced embrittlement of a 2.25CrlMo is investigated by means of small punch testing and scanning electron microscopy (SEM). The ductile-brittle transition temperature (DBTT) determined by the small punch test is much lower than that determined ...
The materials used for cutting tool applications are principally divided in two classes: the WC-Co cemented carbides, tough but with a limited resistance to deformation at high temperature, and the TiCN-Mo-Co cermets, more refractory but less tough than th ...
Polycrystalline specimens of the ferritic-martensitic OPTIMAX A steel have been irradiated on the one hand with neutrons at 523 K to a dose of 2.5 dpa and with 590 MeV protons at ambient temperature and 523 K to doses of about 0.3 and 1 dpa on the other. C ...
In situ cathodoluminescence experiments have been performed to follow the time dependence of the UV luminescence in epitaxial lateral overgrowth GaN specimens. The decrease of the observed intensity and red-shift of the UV peak are interpreted in terms of ...
A new procedure of X-ray line profile analysis based on the dislocation model of strain anisotropy has been applied. The dislocation densities and the subgrain size-distributions in a MANET steel are investigated in the normal condition and after cyclic de ...
A new criterion for the appearance of hot tears in metallic alloys is proposed. Based upon a mass balance performed over the liquid and solid phases, it accounts for the tensile deformation of the solid skeleton perpendicular to the growing dendrites and f ...
We describe the first stage of the evolution of CL spectra, intensity and dislocation contrast under low keV electron beam for ELO-GaN with a low dislocation density. The UV and yellow intensities are decreased by beam irradiation. We have observed a broad ...