scholarly journals Analysis of a Three-Dimensional Slip Field in a Hexagonal Ti Alloy from in-situ High-Energy X-ray Diffraction Microscopy Data

2021 ◽  
pp. 117372
Author(s):  
Darren C. Pagan ◽  
Kelly E. Nygren ◽  
Matthew P. Miller
Keyword(s):  
Three Dimensional ◽  
High Energy ◽  
Ti Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microscopy Data ◽  
Diffraction Microscopy

DART: a robust algorithm for fast reconstruction of three-dimensional grain maps

2010 ◽  
Vol 43 (6) ◽  
pp. 1464-1473 ◽  
Author(s):  
K. J. Batenburg ◽  
J. Sijbers ◽  
H. F. Poulsen ◽  
E. Knudsen
Keyword(s):  
Three Dimensional ◽  
Reconstruction Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iterative Reconstruction Technique ◽  
Discrete Nature ◽  
Fast Reconstruction ◽  
Microscopy Data ◽  
Diffraction Microscopy

A novel algorithm is introduced for fast and nondestructive reconstruction of grain maps from X-ray diffraction data. The discrete algebraic reconstruction technique (DART) takes advantage of the intrinsic discrete nature of grain maps, while being based on iterative algebraic methods known from classical tomography. To test the properties of the algorithm, three-dimensional X-ray diffraction microscopy data are simulated and reconstructed with DART as well as by a conventional iterative technique, namely SIRT (simultaneous iterative reconstruction technique). For 100 × 100 pixel reconstructions and moderate noise levels, DART is shown to generate essentially perfect two-dimensional grain maps for as few as three projections per grain with running times on a PC in the range of less than a second. This is seen as opening up the possibility for fast reconstructions in connection within situstudies.

scholarly journals Three-dimensional α colony characterization and prior-β grain reconstruction of a lamellar Ti–6Al–4V specimen using near-field high-energy X-ray diffraction microscopy

2015 ◽  
Vol 48 (4) ◽  
pp. 1165-1171 ◽  
Author(s):  
E. Wielewski ◽  
D. B. Menasche ◽  
P. G. Callahan ◽  
R. M. Suter
Keyword(s):  
Near Field ◽  
Three Dimensional ◽  
High Energy ◽  
Grain Structure ◽  
X Ray Diffraction ◽  
Orientation Field ◽  
X Ray ◽  
Hexagonal Close Packed ◽  
Flood Fill ◽  
Diffraction Microscopy

Near-field high-energy X-ray diffraction microscopy has been used to characterize the three-dimensional (3-D) crystallographic orientation field of the hexagonal close-packed α phase in a bulk Ti–6Al–4V specimen with a lamellar (β-annealed) microstructure. These data have been segmented using a 3-D misorientation-based grain finding algorithm, providing unprecedented information about the complex 3-D morphologies and spatial misorientation distributions of the transformed α lamella colonies. A 3-D Burgers orientation relationship-based flood-fill algorithm has been implemented to reconstruct the morphologies and crystallographic orientations of the high-temperature body-centered cubic prior-β grains. The combination of these data has been used to gain an understanding of the role of the prior-β grain structure in the formation of specific morphologies and spatial misorientation distributions observed in the transformed α colony structures. It is hoped that this understanding can be used to develop transformation structures optimized for specific applications and to produce more physically realistic synthetic microstructures for use in simulations.

In Situ Observation of Recovery and Grain Growth in High Purity Aluminum

2012 ◽  
Vol 715-716 ◽  
pp. 447-454 ◽  
Author(s):  
C. M. Hefferan ◽  
S. F. Li ◽  
J. Lind ◽  
Ulrich Lienert ◽  
Anthony D. Rollett ◽  
...  
Keyword(s):  
High Purity ◽  
Three Dimensional ◽  
High Energy ◽  
X Ray Diffraction ◽  
Grain Structures ◽  
Modeling Analysis ◽  
Orientation Distributions ◽  
High Purity Aluminum ◽  
Diffraction Microscopy

We have used high energy x-ray diffraction microscopy (HEDM) to study annealing behavior in high purity aluminum. In-situ measurements were carried out at Sector 1 of the Advanced Photon Source. The microstructure in a small sub-volume of a 1 mm diameter wire was mapped in the as-received state and after two differential anneals. Forward modeling analysis reveals three dimensional grain structures and internal orientation distributions inside grains. The analysis demonstrates increased ordering with annealing as well as persistent low angle internal boundaries. Grains that grow from disordered regions are resolution limited single crystals. Together with this recovery behavior, we observe subtle motions of some grain boundaries due to annealing.

scholarly journals Study of slip activity in a Mg-Y alloy by in situ high energy X-ray diffraction microscopy and elastic viscoplastic self-consistent modeling

2018 ◽  
Vol 155 ◽  
pp. 138-152 ◽  
Author(s):  
Leyun Wang ◽  
Zhonghe Huang ◽  
Huamiao Wang ◽  
Alireza Maldar ◽  
Sangbong Yi ◽  
...  
Keyword(s):  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Slip Activity ◽  
Self Consistent ◽  
Diffraction Microscopy

Metal Microstructures in Four Dimensions

2004 ◽  
Author(s):  
S. F. Nielsen ◽  
C. Gundlach ◽  
E. M. Lauridsen ◽  
R. V. Martins ◽  
H. F. Poulsen ◽  
...  
Keyword(s):  
Grain Growth ◽  
Three Dimensional ◽  
High Energy ◽  
Third Generation ◽  
Plastic Strains ◽  
X Rays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Four Dimensions

By Three Dimensional X-ray Diffraction (3DXRD) microscopy it is possible to characterize microstructures non-destructively in 3 dimensions. The measurements are furthermore typically so fast that dynamics may be monitored in-situ, giving also the 4th dimension, namely the time. The 3DXRD technique is based on diffraction of high energy x-rays from third generation synchrotron sources. In the present paper the 3DXRD technique is described and it’s potentials are illustrated by examples relating to elastic and plastic strains, recovery, recrystallization and grain growth.

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