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Kinetics of initial phase separation and coarsening of nanoscale phase in Fe–Cr alloys
- Source :
- Journal of Nuclear Materials. 497:154-160
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- The initial phase separation and coarsening of the Cr-enriched α′ phase in Fe–Cr alloys were studied by utilizing phase field model. The phase separations of the α′ phase via non-classical nucleation and growth, the transition state from nucleation and growth to spinodal decomposition, and the spinodal decomposition were investigated at 700 K for the alloys containing 25, 28 and 35 at.% Cr. The time exponent of the average radius of α′ phase decreases from the growth and coarsening stage to the steady-state coarsening stage for the nucleation growth mechanism, the slope of number density of α′ phase increases at the steady-state coarsening stage with the increased Cr concentration. The velocity of phase separation in 25 at.% Cr alloy with a nucleation growth mechanism are slower than that in high Cr alloys with a spinodal decomposition mechanism. The results indicate that a low concentration alloy is more stable at high temperature, and the phase separation is fast at the early stage, which supply a reference for the alloy composition selection, and for the analysis of the relationship of property and morphology.
- Subjects :
- 010302 applied physics
Nuclear and High Energy Physics
Morphology (linguistics)
Number density
Materials science
Spinodal decomposition
Kinetics
Alloy
Nucleation
Thermodynamics
02 engineering and technology
Radius
engineering.material
021001 nanoscience & nanotechnology
01 natural sciences
Nuclear Energy and Engineering
Phase (matter)
0103 physical sciences
engineering
General Materials Science
0210 nano-technology
Subjects
Details
- ISSN :
- 00223115
- Volume :
- 497
- Database :
- OpenAIRE
- Journal :
- Journal of Nuclear Materials
- Accession number :
- edsair.doi...........53c823b451b98d209eab1db79b0a9ef1
- Full Text :
- https://doi.org/10.1016/j.jnucmat.2017.07.063