Loading…
EBSD characterization of an ECAP deformed Nb single crystal
A niobium single crystal was subjected to equal channel angular pressing (ECAP) at room temperature after orienting the crystal such that [1 −1 −1] ∥ ND, [0 1 −1] ∥ ED, and [−2 −1 −1] ∥ TD. Electron backscatter diffraction (EBSD) was used to characterize the microstructures both on the transverse an...
Saved in:
Published in: | Journal of materials science 2010-09, Vol.45 (17), p.4672-4681 |
---|---|
Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | A niobium single crystal was subjected to equal channel angular pressing (ECAP) at room temperature after orienting the crystal such that [1 −1 −1] ∥ ND, [0 1 −1] ∥ ED, and [−2 −1 −1] ∥ TD. Electron backscatter diffraction (EBSD) was used to characterize the microstructures both on the transverse and the longitudinal sections of the deformed sample. After one pass of ECAP the single crystal exhibits a group of homogeneously distributed large misorientation sheets and a well formed cell structure in the matrix. The traces of the large misorientation sheets match very well with the most favorably oriented slip plane and one of the slip directions is macroscopically aligned with the simple shear plane. The lattice rotation during deformation was quantitatively estimated through comparison of the orientations parallel to three macroscopic axes before and after deformation. An effort has been made to link the microstructure with the initial crystal orientation. Collinear slip systems are believed to be activated during deformation. The full constraints Taylor model was used to simulate the orientation evolution during ECAP. The result matched only partially with the experimental observation. |
---|---|
ISSN: | 0022-2461 1573-4803 |
DOI: | 10.1007/s10853-010-4462-z |