grain boundary

A planar defect representing the interface between two adjacent crystals (grains) with differing crystallographic orientations.

Reducing the average grain size increases the yield strength of an alloy through the Hall-Petch effect, as the increased density of grain boundaries acts as a barrier to dislocation motion.

The interface between two adjacent crystalline grains whose crystal lattices have different orientations.

Reducing the average grain size increased the alloy’s yield strength because the additional grain boundaries impeded dislocation motion.