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Kinetics of initial phase separation and coarsening of nanoscale phase in Fe–Cr alloys

Authors :
Yongsheng Li
Xiaorong Zhou
Zhilong Yan
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.

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