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Title: X-Ray Microdiffraction Characterization of DeformationHeterogeneities in BCC Crystals

Abstract

The deformation behavior of BCC metals is being investigated by x-ray microdiffraction measurements (mu XRD) for the purpose of characterizing the dislocation structure that results from uniaxial compression experiments. The high brilliance synchrotron source at the Advanced Light Source (Lawrence Berkeley National Lab) and the micron resolution of the focusing optics allow for the mapping of Laue diffraction patterns across a sample. These measurements are then analyzed in order to map the distribution of residual stresses in the crystal. An important finding is the observation of Laue spot ''streaking'', which indicates localized rotations in the lattice. These may represent an accumulation of same-sign dislocations. Theoretical modeling of the diffraction response for various slip systems is presented, and compared to experimental data. Preliminary results include orientation maps from a highly strained Ta bicrystal and a less highly strained Mo single crystal. The orientation maps of the bicrystal indicate a cell-like structure of dense dislocation walls. This deformation structure is consistent with previous OIM studies of the same crystal. The results suggest that mu XRD may be a particularly useful tool for microscale studies of deformation patterns in a multi-scale investigation of the mechanisms of deformation that ranges from macroscopic deformation testsmore » to high resolution TEM studies of dislocation structures.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director. Office of Science. Office of Basic EnergySciences, Lawrence Livermore National Laboratory
OSTI Identifier:
885249
Report Number(s):
LBNL-58974
R&D Project: A580ES; BnR: KC0204016; TRN: US0603828
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: Materials Research Society Fall Meeting, Boston,MA, 11/23/2004 - 12/03/2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 36 MATERIALS SCIENCE; ADVANCED LIGHT SOURCE; BICRYSTALS; COMPRESSION; DEFORMATION; DIFFRACTION; DISLOCATIONS; FOCUSING; MONOCRYSTALS; OPTICS; ORIENTATION; RESIDUAL STRESSES; RESOLUTION; SIMULATION; SLIP; SYNCHROTRONS; X-RAY DIFFRACTION; advanced light source als

Citation Formats

Magid, K R, Lilleodden, E T, Tamura, N, Florando, J N, Lassila, D H, LeBlanc, M M, Barabash, R I, and Morris, Jr, J W. X-Ray Microdiffraction Characterization of DeformationHeterogeneities in BCC Crystals. United States: N. p., 2004. Web.
Magid, K R, Lilleodden, E T, Tamura, N, Florando, J N, Lassila, D H, LeBlanc, M M, Barabash, R I, & Morris, Jr, J W. X-Ray Microdiffraction Characterization of DeformationHeterogeneities in BCC Crystals. United States.
Magid, K R, Lilleodden, E T, Tamura, N, Florando, J N, Lassila, D H, LeBlanc, M M, Barabash, R I, and Morris, Jr, J W. 2004. "X-Ray Microdiffraction Characterization of DeformationHeterogeneities in BCC Crystals". United States. https://www.osti.gov/servlets/purl/885249.
@article{osti_885249,
title = {X-Ray Microdiffraction Characterization of DeformationHeterogeneities in BCC Crystals},
author = {Magid, K R and Lilleodden, E T and Tamura, N and Florando, J N and Lassila, D H and LeBlanc, M M and Barabash, R I and Morris, Jr, J W},
abstractNote = {The deformation behavior of BCC metals is being investigated by x-ray microdiffraction measurements (mu XRD) for the purpose of characterizing the dislocation structure that results from uniaxial compression experiments. The high brilliance synchrotron source at the Advanced Light Source (Lawrence Berkeley National Lab) and the micron resolution of the focusing optics allow for the mapping of Laue diffraction patterns across a sample. These measurements are then analyzed in order to map the distribution of residual stresses in the crystal. An important finding is the observation of Laue spot ''streaking'', which indicates localized rotations in the lattice. These may represent an accumulation of same-sign dislocations. Theoretical modeling of the diffraction response for various slip systems is presented, and compared to experimental data. Preliminary results include orientation maps from a highly strained Ta bicrystal and a less highly strained Mo single crystal. The orientation maps of the bicrystal indicate a cell-like structure of dense dislocation walls. This deformation structure is consistent with previous OIM studies of the same crystal. The results suggest that mu XRD may be a particularly useful tool for microscale studies of deformation patterns in a multi-scale investigation of the mechanisms of deformation that ranges from macroscopic deformation tests to high resolution TEM studies of dislocation structures.},
doi = {},
url = {https://www.osti.gov/biblio/885249}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Nov 22 00:00:00 EST 2004},
month = {Mon Nov 22 00:00:00 EST 2004}
}

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