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Engineering LibreTexts

7.11: Grain Boundary Hardening of Poly-Crystals

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  • 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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