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Formation of low angle boundaries in Ni-based superalloys

✍ Scribed by N. D'Souza; M. Newell; K. Devendra; P.A. Jennings; M.G. Ardakani; B.A. Shollock

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 242 KB
Volume: 413-414
Category: Article
ISSN: 0921-5093
DOI: 10.1016/j.msea.2005.08.188

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✦ Synopsis

The evolution of misorientation accompanying branching and growth of dendrite stems advancing into an increasingly undercooled liquid at a geometrical discontinuity in cross section (platform of a turbine blade) during solidification of a Ni-base superalloy has been experimentally investigated. The misorientation generated is cumulative in nature with a systematic rotation of the principal 0 0 1 -crystal axes. It is proposed that the misorientation arises from plastic deformation of the dendrite stems during growth. Low angle boundaries are subsequently produced across impinging dendrite fronts.

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