MSE306Chap6GrainBoundaries

MSE306Chap6GrainBoundaries - Grain Boundaries So far, our...

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Grain Boundaries So far, our emphasis has been on single crystals We have discussed general crystallography and the diffraction techniques used to explore crystal structures. We have also discussed some crystal defects 0-D Point defects (vacancies and interstitials) introduced 1-D Line defects (dislocations) 2-D Planar defects (stacking faults) Grain boundaries represent another kind of planar defect, the region between two crystals of different orientation.
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Tilt Grain Boundary The fact that grain boundaries separate crystals of different orientations introduces their first geometrical parameter… MISORIENTATION A simple tilt boundary can help introduce this concept. φ
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Twist Grain Boundary Obviously, a tilt boundary is not the only possible boundary type. Consider a twist boundary… In a way, a tilt boundary is analogous to an edge dislocation, where the rotation is perpendicular to the boundary plane (alternatively, we could say the rotation axis lies within the boundary plane). Similarly, the twist boundary is analogous to a screw dislocation, and the rotation axis is perpendicular to the boundary plane. φ
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Dislocation Model of a Low Angle Tilt Boundary Interestingly, a tilt boundary can be understood as an array of edge dislocations. The
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MSE306Chap6GrainBoundaries - Grain Boundaries So far, our...

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