Abstract
AbstractThe 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 (ΔHAl0 = −11.5 ± 0.5 kJ/mol, ΔSAl0 = −7.5 ± 0.5 J/mol.K) and chromium (ΔHCr0 = −8 ± 2 kJ/mol, ΔSCr0 = −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.
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