Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 26, Issue 6, Pages 661-669Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/026708309X12468927349370
Keywords
Grain boundaries; Grain boundary energy; Superalloy; EBSD; Serial sectioning; Three-dimensional microstructure
Funding
- National Science Foundation [DMR-0520425]
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Three-dimensional electron backscatter diffraction data, obtained by serial sectioning a nickel base superalloy, has been analysed to measure the geometric arrangement of grain boundary planes at triple junctions. This information has been used to calculate the grain boundary character distribution (GBCD) and the grain boundary energy distribution (GBED). The twin content from the three-dimensional GBCD calculation compares favourably with the twin content estimated by stereology. Important factors in the analysis are the alignment of the parallel layers, the ratio of the out-of-plane to in-plane spacing of the discrete orientation data and the discretisation of the domain of grain boundary types. The results show that grain boundaries comprised of (111) planes occur most frequently and that these grain boundaries have a relatively low energy. The GBCD and GBED are inversely correlated.
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