| 21. | This leads to the decrease of grain boundary strengthening effect.
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| 22. | However, a crack that propagates along the grain boundaries is termed an intergranular fracture.
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| 23. | Grain boundaries are interfaces where crystals of different orientations meet.
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| 24. | Some of these maps describe grain orientation, grain boundary, diffraction pattern ( image ) quality.
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| 25. | At high temperatures, grain boundaries are weaker than grains.
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| 26. | Irregularities at the grain boundaries in materials can produce dislocations which propagate into the grain.
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| 27. | Grain boundaries also cause deformation in that they are sources and sinks of point defects.
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| 28. | The original concentration of solute around the grain boundary will be asymmetrical in most cases.
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| 29. | Like a grain boundary, a twin boundary has different crystal orientations on its two sides.
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| 30. | Since grain boundaries are defects in the crystal structure they tend to decrease the creep.
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