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Orientation Distribution of Σ3 Grain Boundary Planes in Ni before and after Grain Boundary Engineering

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Abstract:

The distribution of grain boundary plane orientations in polycrystalline Ni has been measured before and after grain boundary engineering. The grain boundary engineered microstructure has a relatively higher concentration of Σ3 grain boundaries and, when compared to the initial structure, more of these boundaries have orientations that are inclined by more than 10° from the (111) orientation of the ideal coherent twin. Although the conventionally measured grain size is not affected by the grain boundary engineering process, the average size of the regions containing only Σ3n grain boundaries increases by nearly a factor of two. The observations indicate that the increase in the relative population of Σ3 grain boundaries results both from the preferential elimination of random grain boundaries and the generation of new Σ3 grain boundaries which do not have (111) grain boundary plane orientations.

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Periodical:

Materials Science Forum (Volumes 558-559)

Pages:

641-647

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.558-559.641

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Online since:

October 2007

Authors:

Herbert M. Miller, Chang Soo Kim, Jason Gruber, Valerie Randle, Gregory S. Rohrer

Keywords:

Grain Boundary Character Distribution (GBCD), Grain Boundary Engineering, Grain Boundary Plane, Orientation Imaging Microscopy, Twin

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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