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Assessing the grain structure of highly X-ray absorbing metallic alloys

  • Therese Bormann , Felix Beckmann , Michael Schinhammer , Hans Deyhle , Michael de Wild and Bert Müller
Published/Copyright: August 15, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 7

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: X-ray diffraction contrast tomography; Shape memory alloy NiTi; High-energy microtomography; Selective laser melting; Polycrystalline Fe-alloy
*Correspondence address, Prof. Dr. Bert Müller, Biomaterials Science Center, University of Basel, c/o University Hospital, 4031 Basel, Switzerland, Tel.: +41 61 265 9660, Fax: +41 61 265 9699, E-mail:

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Received: 2013-10-04
Accepted: 2013-12-09
Published Online: 2014-08-15
Published in Print: 2014-07-14

© 2014, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111052
Keywords for this article
X-ray diffraction contrast tomography; Shape memory alloy NiTi; High-energy microtomography; Selective laser melting; Polycrystalline Fe-alloy

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Materials tomography is coming of age
  5. Original Contributions
  6. Microtomographic assessment of damage in P91 and E911 steels after long-term creep
  7. Imaging of nano-seeded nucleation in cement pastes by X-ray diffraction tomography
  8. High-speed in-situ tomography of liquid protein foams
  9. Imaging of hydrogen in steels using neutrons
  10. Characterization of multilayer structures in fiber reinforced polymer employing synchrotron and laboratory X-ray CT
  11. Ptychographic Fresnel coherent diffraction tomography at the nanoscale
  12. Materials research and non-destructive testing using neutron tomography methods
  13. The PPI value of open foams and its estimation using image analysis
  14. Combined use of micro computed tomography and histology to evaluate the regenerative capacity of bone grafting materials
  15. Assessing the grain structure of highly X-ray absorbing metallic alloys
  16. Microstructural analysis of a C/SiC ceramic based on the segmentation of X-ray phase contrast tomographic data
  17. People
  18. Prof. Dr. Dr. h. c. Lorenz Ratke on his 65th birthday
  19. DGM News
  20. DGM News
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