7.7 - Grains become elongated in the direction of the...

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Consider the deformation of a poly-crystalline material In a polycrystalline material, the direction of slip varies from one grain to another. For each grain, dislocation motion occurs along the slip system that has the most favorable orientation to the applied stress. Mechanical integrity and coherency are maintained along the grain boundaries; hence, each grain is constrained by its neighbors.
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Unformatted text preview: Grains become elongated in the direction of the applied stress. Poly-crystalline materials are generally stronger than single crystal materials for 2 reasons: 1. Even though a single grain may be favorably oriented with the applied stress for slip to occur, it can’t deform until adjacent and less favorable oriented grains do. 2. Grain boundaries act as obstacles to slip....
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