Polychromatic microdiffraction characterization of defect gradients in severely deformed materials.
This paper analyzes local lattice rotations introduced in severely deformed polycrystalline titanium by friction stir welding. Nondestructive three-dimensional (3D) spatially resolved polychromatic X-ray microdiffraction, is used to resolve the local crystal structure of the restructured surface from neighboring local structures in the sample material. The measurements reveal strong gradients of strain and geometrically necessary dislocations near the surface and illustrate the potential of polychromatic microdiffraction for the study of deformation in complex materials systems.
Barabash
Rozaliya I
RI
Materials Science and Technology Division of Oak Ridge National Laboratory, Oak Ridge, TN, United States. barabashr@ornl.gov
Ice
Gene E
GE
Liu
Wenjun
W
Barabash
Oleg M
OM