Assessing the grain structure of highly X-ray absorbing metallic alloys
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Author (Corporation)
Publication date
07.2014
Typ of student thesis
Course of study
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
International Journal of Materials Research
Special issue
DOI of the original publication
Link
Series
Series number
Volume
105
Issue / Number
7
Pages / Duration
692 - 701
Patent number
Publisher / Publishing institution
De Gruyter
Place of publication / Event location
Edition
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Programming language
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Practice partner / Client
Abstract
Selective laser melting allows the fabrication of NiTi implants with pre-defined, complex shapes. The control of the process parameters regulates the arrangement of the granular microstructure of the NiTi alloy. We prepared specimens with elongated grains, which build a sound basis for diffraction contrast tomography experiments using synchrotron radiation and for electron backscatter diffraction measurements. Both approaches reveal the orientation and size of the individual grains within the specimen. Still, electron backscatter diffraction is confined to two-dimensional cross-sections while diffraction contrast tomography reveals these microstructural features in three dimensions. We demonstrate that the grains in the selective laser melted specimen, which are oriented along the building direction, do not exhibit a well-defined planar grain orientation but are twisted. These twisted grains give rise to diffraction spots observable for several degrees of specimen rotation simultaneously to the acquisition of tomography data.
Keywords
High-energy microtomography, Polycrystalline Fe-alloy, Selective laser melting, Shape memory alloy NiTi, X-ray diffraction contrast tomography
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ISBN
ISSN
2195-8556
1862-5282
1862-5282
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
License
Citation
Bormann, T., Beckmann, F., Schinhammer, M., Deyhle, H., de Wild, M., & Müller, B. (2014). Assessing the grain structure of highly X-ray absorbing metallic alloys. International Journal of Materials Research, 105(7), 692–701. https://doi.org/10.3139/146.111052