Abstract
Auger electron spectroscopy and energy filtering TEM were used to study alloying element distributions in the vicinity of matrix–TiO2 dispersoid interphase boundaries in an Fe–Cr ferritic steel strengthened by dispersed TiO2 particles. Pronounced interfacial Cr segregation was found to occur in the course of annealing at 700°C. The Cr segregation also leads to Cr diffusion into the dispersoids and to the formation of oxide phases with different Cr/Ti ratios. The observed Cr segregation is described in terms of diffusion into the field of elastic stresses.
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