Microstructures of Niobium Components Fabricated by Electron Beam Melting

This article presents columnar grain structures characteristic of niobium components fabricated by electron beam melting, using two different size and size distribution spherical powders produced by rapid solidification atomization. The precursor powder microstructures are characterized by equiaxed...

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Bibliographic Details
Published in:Metallography, microstructure, and analysis microstructure, and analysis, 2013-06, Vol.2 (3), p.183-189
Main Authors: Martinez, Edwin, Murr, Lawrence E., Hernandez, Jennifer, Pan, Xuemin, Amato, Krista, Frigola, Pedro, Terrazas, Cesar, Gaytan, Sara, Rodriguez, Emmanuel, Medina, Francisco, Wicker, Ryan B.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Materials Science
Metallic Materials
Nanotechnology
Structural Materials
Surfaces and Interfaces
Technical Article
Thin Films
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Summary:This article presents columnar grain structures characteristic of niobium components fabricated by electron beam melting, using two different size and size distribution spherical powders produced by rapid solidification atomization. The precursor powder microstructures are characterized by equiaxed grains while the columnar grain structure in the electron beam melted (EBM)-fabricated products contain dislocation substructures ranging in density from ~10 9 to 10 10 /cm 2 as observed by transmission electron microscopy. X-ray diffraction analysis illustrates the variations in orientations in both the processor powders and the fabricated components. Microindentation hardness values ranged from 0.8 GPa for the precursor powders and 1.1 and 0.92 GPa for the EBM-fabricated, solid components.
ISSN:2192-9262
2192-9270
DOI:10.1007/s13632-013-0073-9