Dynamic recovery observed in distinct grains within a polycrystalline nickel-based superalloy during cyclic high temperature fatigue via high energy X-ray diffraction microscopy

2021 ◽  
Vol 192 ◽  
pp. 37-42
Author(s):  
Sven E. Gustafson ◽  
Darren C. Pagan ◽  
Paul A. Shade ◽  
Michael D. Sangid
Keyword(s):  
High Temperature ◽  
Dynamic Recovery ◽  
High Energy ◽  
X Ray Diffraction ◽  
Polycrystalline Nickel ◽  
X Ray ◽  
High Temperature Fatigue ◽  
Nickel Based Superalloy ◽  
Diffraction Microscopy

scholarly journals Characterization of neutron-irradiated HT-UPS steel by high-energy X-ray diffraction microscopy

2016 ◽  
Vol 471 ◽  
pp. 280-288 ◽  
Author(s):  
Xuan Zhang ◽  
Jun-Sang Park ◽  
Jonathan Almer ◽  
Meimei Li
Keyword(s):  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Microscopy

Three-dimensional plastic response in polycrystalline coppervianear-field high-energy X-ray diffraction microscopy

2012 ◽  
Vol 45 (6) ◽  
pp. 1098-1108 ◽  
Author(s):  
S. F. Li ◽  
J. Lind ◽  
C. M. Hefferan ◽  
R. Pokharel ◽  
U. Lienert ◽  
...  
Keyword(s):  
Goodness Of Fit ◽  
Polycrystalline Sample ◽  
High Energy ◽  
Three Dimensions ◽  
X Ray Diffraction ◽  
Orientation Field ◽  
X Ray ◽  
Alignment Procedure ◽  
Polycrystal Plasticity ◽  
Diffraction Microscopy

The evolution of the crystallographic orientation field in a polycrystalline sample of copper is mapped in three dimensions as tensile strain is applied. Using forward-modeling analysis of high-energy X-ray diffraction microscopy data collected at the Advanced Photon Source, the ability to track intragranular orientation variations is demonstrated on an ∼2 µm length scale with ∼0.1° orientation precision. Lattice rotations within grains are tracked between states with ∼1° precision. Detailed analysis is presented for a sample cross section before and after ∼6% strain. The voxel-based (0.625 µm triangular mesh) reconstructed structure is used to calculate kernel-averaged misorientation maps, which exhibit complex patterns. Simulated scattering from the reconstructed orientation field is shown to reproduce complex scattering patterns generated by the defected microstructure. Spatial variation of a goodness-of-fit or confidence metric associated with the optimized orientation field indicates regions of relatively high or low orientational disorder. An alignment procedure is used to match sample cross sections in the different strain states. The data and analysis methods point toward the ability to perform detailed comparisons between polycrystal plasticity computational model predictions and experimental observations of macroscopic volumes of material.

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.

scholarly journals High-energy x-ray diffraction microscopy study of deformation microstructures in neutron-irradiated polycrystalline Fe-9%Cr

2018 ◽  
Vol 508 ◽  
pp. 556-566 ◽  
Author(s):  
Xuan Zhang ◽  
Meimei Li ◽  
Jun-Sang Park ◽  
Peter Kenesei ◽  
Hemant Sharma ◽  
...  
Keyword(s):  
Microscopy Study ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Microscopy

Exploring new links between crystal plasticity models and high-energy X-ray diffraction microscopy

2019 ◽  
Vol 23 (5) ◽  
pp. 100763 ◽  
Author(s):  
Paul A. Shade ◽  
William D. Musinski ◽  
Mark Obstalecki ◽  
Darren C. Pagan ◽  
Armand J. Beaudoin ◽  
...  
Keyword(s):  
Crystal Plasticity ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Microscopy

scholarly journals Quantifying Damage Accumulation Using State-of-the-Art FFT Method

2011 ◽  
Vol 702-703 ◽  
pp. 515-518
Author(s):  
Reeju Pokharel ◽  
S. F. Li ◽  
J. Lind ◽  
C. M. Hefferan ◽  
U. Lienert ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Fourier Transform ◽  
Damage Accumulation ◽  
State Of The Art ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
3D Microstructure ◽  
Schmid Factor ◽  
Diffraction Microscopy

A 3D microstructure, measured by high-energy x-ray diffraction microscopy, is used as an input to a parallelized viscoplastic Fast Fourier Transform code (VPFFT) to simulate a tensile test. Distributions of strain, damage accumulation, neighbor interactions, and Schmid factor mismatch throughout the microstructure are calculated. These results will form the basis of a direct comparison to microstructure maps that track plastic deformation in the real sample.

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