Grain Boundaries by Louisette Priester

Author:Louisette Priester
Language: eng
Format: epub
Publisher: Springer Netherlands, Dordrecht

6.10 Concluding Remarks

The distinction between the quantity of solute resulting from an equilibrium mechanism and that coming from a non-equilibrium mechanism is not obvious. But whatever the mechanism, segregation induces a grain boundary embrittlement or strengthening, depending on the geometrical boundary parameters. Controlling grain boundary resistance to fracture requires to control grain boundary segregation. We may play on the competition between the segregated elements to favour segregation of a strengthening element at the expense of that of embrittling elements. Then, we enter the domain of Grain boundary Engineering.

As a transition to the next chapter, grain boundary segregation, equilibrated or not, often constitutes a preliminary stage for precipitation. The transition between the two phenomena is not easy to identify; in particular, when a 2D film with the same composition and structure than the 3D compound appears at the boundary. Precipitation strongly affects the grain boundary behaviours, either with a complementary effect to the segregation or in an opposite way as noted for the dislocation stabilization. An approach of the interfacial precipitation is thus a prerequisite to the understanding of the grain boundary properties and constitutes the subject of the following chapter.

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