Investigation of Changes of Short-range Ordering and Electron Density in Simulating Alloys Based on Iron

Short-range ordering and electron density in simulation alloys, containing Cr, Mo, W and V as a doping addition, were studied by Mossbauer spectroscopy and positron annihilation methods. A number of peculiarities was observed in alloys with vanadium as a doping

Study of electronic properties of transition metals and alloys by positron annihilation spectroscopy

Section V. Equipment, Methods and Automation of Nuclear Experiments, Interaction of Nuclear Radiation with the Matter and Applications of Methods of Nuclear Physic

Study of electronic properties of transition metals and alloys by positron annihilation spectroscopy

Section V. Equipment, Methods and Automation of Nuclear Experiments, Interaction of Nuclear Radiation with the Matter and Applications of Methods of Nuclear Physic

Study of PRIMAVERA Steel Samples by Positron Annihilation Spectroscopy Technique II – Lifetime Measurements

In the present article, a positron annihilation lifetime technique was used for the study of VVER-440/230 weld materials, manufactured in the frame of the international PRIMAVERA project on microstructural investigation of the irradiated WWER-440 reactor pressure vessel steel. The present results complement our previous report of positron angular correlation experiments and provide in-depth characterization of vacancy type defects behavior under irradiation and thermal treatment. The results give new insight into the previously published atom probe tomography and angular correlation of annihilation radiation studies. The measurements do not show any association of phosphorus or its segregation to the open volume defects investigated by positron annihilation spectroscopy. The embrittlement effects related to the phosphorus seem to be effectively annealed-out during 475 °C thermal treatment and the post annealing microstructure and mechanical properties of the material are consequently affected mostly by agglomerations of vacancy clusters coarsened during thermal treatment.JRC.F.4-Safety of future nuclear reactor