Characterizing the Local Primary Dendrite Arm Spacing in Directionally Solidified Dendritic Microstructures

Characterizing the spacing of primary dendrite arms in directionally solidified microstructures is an important step for developing process–structure–property relationships by enabling the quantification of (i) the influence of processing on microstructure and (ii) the influence of microstructure on...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2014-01, Vol.45 (1), p.426-437
Main Authors: Tschopp, Mark A., Miller, Jon D., Oppedal, Andrew L., Solanki, Kiran N.
Format: Article
Language:English
Subjects:
Alloy solidification
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Correlation
Dendritic structure
Directional solidification
Exact sciences and technology
Materials Science
Metallic Materials
Metallurgy
Metals. Metallurgy
Micrographs
Microstructure
Nanotechnology
Photomicrographs
Spatial distribution
Structural Materials
Surfaces and Interfaces
Tessellation
Thin Films
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Summary:Characterizing the spacing of primary dendrite arms in directionally solidified microstructures is an important step for developing process–structure–property relationships by enabling the quantification of (i) the influence of processing on microstructure and (ii) the influence of microstructure on properties. In this work, we utilized a new Voronoi-based approach for spatial point pattern analysis that was applied to an experimental dendritic microstructure. This technique utilizes a Voronoi tessellation of space surrounding the dendrite cores to determine nearest neighbors and the local primary dendrite arm spacing. In addition, we compared this technique to a recent distance-based technique and a modification to this using Voronoi tessellations. Moreover, a convex hull-based technique was used to include edge effects for such techniques, which can be important for thin specimens. These methods were used to quantify the distribution of local primary dendrite arm spacings, their spatial distribution, and their correlation with interdendritic eutectic particles for an experimental directionally solidified Ni-based superalloy micrograph. This can be an important step for correlating processing and properties in directionally solidified dendritic microstructures.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-013-1985-3