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Special Properties of Nanomaterials

Grain Sire (om)

>'ig. i. Vo!ame fracnon of a nam>cryxialiintr materia' found in (ńe ótUircryrialhns region, on grain boundaries. and OS tripłejunetions, as O funenon cf grain size flakonJrom rej. 64J.

Most atoms reside on surface of grains or very close to the surface

Grain boundaries are obstacles in disloeation motion

Dislocation (if any) are immediately pushed away ffom the grain

Grain boundaries ereate a kind of stiff crate hardening the materia!