Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 97, Issue 2, Pages 622-630Publisher
WILEY
DOI: 10.1111/jace.12669
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Funding
- ONR-MURI [N00014-11-1-0678]
- Swiss National Science Foundation [200021-122288/1]
- MRSEC program of the National Science Foundation [DMR-0520425]
- Swiss National Science Foundation (SNF) [200021-122288] Funding Source: Swiss National Science Foundation (SNF)
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Grain-boundary character distributions (GBCDs) were determined for spark plasma sintered Y- and La-doped aluminas prepared at temperatures between 1450 degrees C and 1600 degrees C. La doping leads to grain boundaries that adopt (0001) orientations 3.7 times more frequently than expected in a random distribution, whereas the Y-doped microstructures are more equiaxed. At 1500 degrees C, some of the boundaries in the Y-doped samples transform to a higher mobility complexion; in this microstructure, the {01 (1) over bar2} grain-boundary plane is 1.3 times more likely to occur than expected in a random distribution. After the fast-growing grains impinge, the dominant plane becomes {11 (2) over bar0} and these boundaries have areas that are 1.2 times more likely to occur than expected in a random distribution. The grain-boundary planes in the Y- and La-codoped samples preferred (0001) and {01 (1) over bar2>} orientations, combining the characteristics of the singly doped samples. Grain boundaries with a 60 degrees misorientation about [0001] were up to six times more common than random in the Y-doped samples. The preference for (0001) oriented grain-boundary planes in the La-doped sample persisted at all specific misorientations.
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