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Phase Transformations in Irradiated Metals

#0467


Atom Probe Field Ion and Scanning Tunneling Microscopy of Defects and Structure Phase Transformations in Metals and Alloys while Impulse and Stationary Irradiation by High Energy Particles.

Tech Area / Field

  • PHY-STM/Structural Mechanics/Physics

Status
8 Project completed

Registration date
01.11.1995

Completion date
30.01.2001

Senior Project Manager
Karabashev S G

Leading Institute
ITEF (ITEP), Russia, Moscow

Supporting institutes

  • Ural Branch of RAS / Institute of Metal Physics, Russia, Sverdlovsk reg., Ekaterinburg\nAssociation "Ultramicroscopy in Science and Technology", Russia, Moscow\nVNIITF, Russia, Chelyabinsk reg., Snezhinsk

Collaborators

  • Chalmers University of Technology / Department of Physics, Sweden, Gothenburg\nTohoku University / Institute for Materials Research (IMR), Japan, Sendai\nJAERI / Department of Material Science and Engineering, Japan, Tokai Mura\nUniversité de Rouen / Laboratoire de Microscopie Ionique, France, Mont Saint Aignan

Project summary

The main objective of the project is to carry out experimental investigations of the formation, behaviour, and thin structure of surface and volume radiation defects in metals and alloys, exposure of material physical characteristics closely relating to the values of radiation defects. The investigations will focus on the details ( in atom scale) of primary acts of radiation defects formation, and on the analysis of interaction of point-like defects with other structure imperfections of materials, discovery of mechanism and kinetics of transformation (intermetalid decay, delamination of solid solution, disordering of atoms, segregation phenomena, etc.), stimulated by the radiation.

It is planned that the defect structure of materials and structure-dependent properties will be investigated using modern experimental methods. Among them are the methods with the atomic space resolution, namely, atom probe field ion and scanning tunneling microscopy. For an increase of obtained information and unambiguous interpretation, other experimental methods, like transmission electron microscopy, neutron and X-ray graphy, Auger-electrons and Messbauer spectroscope annihilation of positrons, resistance measurements will be used.

The materials to be investigated include refractory metal's and alloys, Fe-Ni alloys, very important modern constructional materials for use in nuclear power industry, like different graphites, steels for reactor vessels, vessel titanium alloys. The materials will be tested using neutrons, fission fragments, ions and electrons. The whole scope of irradiation will provide single displacement of atoms, development of atomic cascades in a wide range, specific changes in. the surface atom layers and deep inside of tested materials, generation of material; phases.

The project results in a good deal of experimental data showing a complete picture of radiation defects under a broad range of experimental conditions for a variety of materials very important for nuclear industry. After analysis of the obtained data a set of practical recommendations will be derived to enhance the radiation resistance of constructional materials for the use in the nuclear industry.


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