Projects per year
Abstract
Techniques for obtaining 3 dimensional information of individual
crystals, socalled grains, in polycrystalline materials are important
within the field of materials science for understanding and modeling
the behavior of materials.In the last decade, a number of nondestructive
X-ray diffraction techniques have been developed,
which basically group into two classes: imaging techniques and
scanning techniques each having their advantages and drawbacks.
The imaging techniques have fast acquisition times but have
reached the limit in resolution and the scanning techniques suffer
from slow acquisition times.
The purpose of this PhD-project is to develop and implement a new
technique, the Boxscan technique, which positions itself between
imaging and scanning techniques. The Boxscan technique bases its
spatial information on a scanning approach but uses extended linebeams
known from the imaging techniques.
Combining this with a novel 6-dimensional indexing routine it is
possible to determine grain centers, radii and orientations of
hundreds of individual grains in a sample. The grain centers are
found with a precision which is better than the stepping size, and
thus provides a road towards future non-destructive 3D studies of
nanomaterials.
It is furthermore shown that the Boxscan technique can be extended
to provide full 3D grain maps by using either Laguerre tessellations
or iterative reconstruction methods such as e.g. the algebraic
reconstruction technique (ART). A 3D grain map of a meta-stable
beta titanium alloy comprising 1265 grains has been produced as
part of a collaboration on spatial resolved strain measurements
with Cornell University, USA, and the Advanced Photon Source,
USA.
Original language | English |
---|
Place of Publication | Roskilde |
---|---|
Publisher | Risø National Laboratory for Sustainable Energy, Technical University of Denmark |
Number of pages | 152 |
ISBN (Print) | 978-87-550-3882-0 |
Publication status | Published - Jan 2011 |
Series | Risø-PhD |
---|---|
Number | 73(EN) |
Keywords
- Materials characterisation and modelling
- Risø-PhD-73(EN)
- Risø-PhD-73
- Risø-PhD-0073
Fingerprint
Dive into the research topics of 'Development of tomographic reconstruction methods in materials science with focus on advanced scanning methods'. Together they form a unique fingerprint.Projects
- 1 Finished
-
Development of tomographic reconstruction methods for material science with focus on advanced scanning methods
Lyckegaard, A. (PhD Student), Lauridsen, E. M. (Main Supervisor), Larsen, R. (Supervisor), Hansen, P. C. (Examiner), Ralph, B. (Examiner) & Suter, R. M. (Examiner)
01/08/2007 → 20/04/2011
Project: PhD