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  Cornell University

MAE Publications and Papers

Sibley School of Mechanical and Aerospace Engineering

New article: Three-Dimensional Alpha Colony Characterization and Prior-Beta Grain Reconstruction of a Lamellar Ti-6AI-4V Specimen using Near-Field High-Energy X-ray Diffraction Microscopy

Article:  Wielewski, E; Menasche, DB; Callahan, PG; Suter, RM; (2015)  ” Three-Dimensional Alpha Colony Characterization and Prior-Beta Grain Reconstruction of a Lamellar Ti-6AI-4V Specimen using Near-Field High-Energy X-ray Diffraction Microscopy”, Journal of Applied Crystallography, 48:1165-1171

DOI

Abstract:  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 alpha phase in a bulk Ti-6Al-4V specimen with a lamellar (beta-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 alpha 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-beta grains. The combination of these data has been used to gain an understanding of the role of the prior-beta grain structure in the formation of specific morphologies and spatial misorientation distributions observed in the transformed alpha 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.

 

 

Funding Acknowledgement:  US Office of Naval Research [N00014-12-1-0075]; DOE Office of Science [DE-AC02-06CH11357]

 

Funding Text:  The authors would like to thank Dr Jun-Sang Park and Dr Peter Kenesei for their help with the experiment at the Advanced Photon Source. Thanks also go to Professor Paul Dawson for providing access to the ODFPF package, which was utilized extensively for crystallographic analyses in the prior-beta grain reconstruction algorithm and post-processing analysis tools. This research was funded by the US Office of Naval Research under contract No. N00014-12-1-0075. This research used resources of the Advanced Photon Source, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract No. DE-AC02-06CH11357.

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