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Solute segregation at grain boundaries of a partially ordered Fe 3 Al base alloy
Author(s) -
Lejček Pavel,
Hofmann Siegfried
Publication year - 2004
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1805
Subject(s) - grain boundary , alloy , crystallite , materials science , aluminium , enthalpy , chromium , metallurgy , thermodynamics , intergranular corrosion , grain boundary strengthening , crystallography , chemistry , microstructure , physics
The equilibrium chemical composition of grain boundaries in a polycrystalline FeAlCr ordered alloy was studied using AES at intergranular fracture surfaces. It was found that the grain boundaries are slightly enriched in aluminium and chromium. The temperature dependence of grain boundary segregation was correlated according to a recently proposed model of grain boundary segregation in ordered alloys that provides the values of enthalpy and entropy of grain boundary segregation of aluminium (Δ H Al 0 = −11.5 ± 0.5 kJ/mol, Δ S Al 0 = −7.5 ± 0.5 J/mol.K) and chromium (Δ H Cr 0 = −8 ± 2 kJ/mol, Δ S Cr 0 = −4 ± 2 J/mol.K) in α‐iron. These values are in agreement with predictions of grain boundary segregation parameters. Copyright © 2004 John Wiley & Sons, Ltd.