Radiation-induced segregation in FeNiCr model alloys


Radiation-induced segregation in FeNiCr model alloys

Bakaev, A.; Posselt, M.; Terentyev, D.; Bonny, G.; Zhurkin, E. E.

Defect-free FeNiCr alloys:

No influence of Ni on Cr solubility, limited effect of Cr on Ni at 2%Ni : ↗100 K
Ni and Cr precipitate as separate fractions. Ni forms B2 FeNi clusters with {100} facets while the Cr atoms form pure Cr clusters with {110} facets
FeNiCr alloys with dislocation loops:
No mixing of Ni and Cr precipitates: Ni moves to compressive regions, Cr - tensile regions
Dislocation loops stabilize by 100-200 K Ni clusters only at Ni content in the alloy >=0.5%
Ni decreases significantly the segregation of Cr, cancelling the segregation or causing the depletion at Ni>=1%
Cr decreases the segregation of Ni at ½<111> loops for low Ni (0.25%) alloys, strongly enhances the Ni segregation at <100> loops for high Ni (2%) at T < 800 K due to Cr depletion
Enrichment values for Cr and Ni at ½<111 > loops at T = 600 K are consistent with experiments:
small ½<111> loops can serve as nucleus for NiCr(Si/P)-rich clusters

Keywords: FeCrNi alloys; radiation-induced segregation; Metropolis Monte Carlo simulation

  • Lecture (Conference)
    8th N-FAME Workshop on modelling and modelling-oriented experiments in Fe alloys for nuclear applications, 13.-14.06.2016, Brussels, Belgium

Permalink: https://www.hzdr.de/publications/Publ-23840
Publ.-Id: 23840