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Grain boundary grooving at the singular surfaces

✍ Scribed by E. Rabkin; L. Klinger; V. Semenov

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 373 KB
Volume: 48
Category: Article
ISSN: 1359-6454
DOI: 10.1016/s1359-6454(99)00432-2

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✦ Synopsis

AbstractÐThe unusual topographies of the grain boundary thermal grooves in Ni-rich NiAl were observed after annealing at 14008C. One of the surfaces forming the grain boundary groove exhibited no curvature measurable in the atomic force microscope, thus indicating its singular character. The theory of grain boundary grooving at singular surfaces was developed in the small-slope approximation and under assumption of negligible diusivity on these surfaces. The calculated groove shapes are in good agreement with the experimental data and dier considerably from the shapes predicted by the classical Mullins grooving theory for isotropic surfaces.

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