| 31. | Grain boundaries are generally only a few nanometers wide.
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| 32. | This decrease in net chemical potential will decrease the grain boundary velocity and therefore grain growth.
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| 33. | In order to minimize the effect on properties, grain boundaries are aligned parallel to the dendrites.
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| 34. | During grain boundary migration, the rate determining step depends on the angle between two adjacent grains.
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| 35. | This reduces the total area of grain boundary and hence the stored energy in the material.
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| 36. | Manganese sulfide inclusions have a higher melting point and do not concentrate at the grain boundaries.
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| 37. | In a two-dimensional isotropic material the grain boundary tension would be the same for the grains.
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| 38. | Selective leaching often involves grain boundary depletion mechanisms.
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| 39. | Densification is only achieved at temperatures above 1800 �C once grain boundary diffusion mechanisms become active.
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| 40. | These include recombination at defects and grain boundaries.
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