Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Teaching & Learning Packages Mechanisms of Plasticity Grain boundary hardening of poly-crystals
Mechanisms of Plasticity AimsBefore you startIntroductionDislocation generationDislocation interactions Sessile dislocationsClimb and cross slipDislocation intersections to form jogs and kinksDeformation of a single crystalForest hardeningContinuum models describing the true stress-strain curvesGrain boundary hardening of poly-crystalsSummaryQuestionsGoing further
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Grain boundary hardening of poly-crystals

Compared to single crystals, poly-crystals tend to have higher yield stresses. This is because each grain in the poly-crystals has to undergo a complex shape change which is consistent with those of their neighbors, requiring multiple slips from the start. Therefore, unlike single-crystals, poly-crystals do not exhibit any kind of ‘easy glide’ when they are deformed.

Below is an explanation of how grain boundary hardening arises in a poly-crystal:

 

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