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The effect of Mn/Ni on thermodynamic properties of critical nucleus in Fe-Cu-Mn (Ni) ternary alloys
- Source :
- Journal of Nuclear Materials. 507:59-67
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The aging- or radiation-induced hardening of Cu/Mn/Ni precipitates in Fe alloys is one of property degradation mechanisms in structural materials in nuclear reactors. Experiments show that aging or radiation leads the formation of Cu-rich precipitates, and the addition of Mn or Ni elements enhances the precipitation kinetics. In this work, the phase-field model coupled with the constrained string method have been applied to investigate the thermodynamic properties of critical nuclei such as the minimum energy path of Cu/Mn/Ni precipitation in Fe-Cu-Mn and Fe-Cu-Ni ternary alloys. The chemical free energies used in the model are taken from CALPHAD. The simulation results show that the formation of Cu/Mn/Ni clusters needs to overcome an energy barrier, and the precipitate has a Core-Shell structure. The thermodynamic properties of the critical nucleus are influenced by temperature and Cu/Mn/Ni overall concentrations, which are in accordance with the simulation results as well as the experimental observations.
- Subjects :
- 010302 applied physics
Nuclear and High Energy Physics
Precipitation kinetics
Materials science
Structural material
Precipitation (chemistry)
Thermodynamics
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Nuclear Energy and Engineering
0103 physical sciences
Hardening (metallurgy)
General Materials Science
Critical nucleus
0210 nano-technology
Ternary operation
CALPHAD
Subjects
Details
- ISSN :
- 00223115
- Volume :
- 507
- Database :
- OpenAIRE
- Journal :
- Journal of Nuclear Materials
- Accession number :
- edsair.doi...........e24592993a5be20fad1ca95c79d70309