TY - JOUR
T1 - Reconstruction of Stress and Composition Profiles from X-ray Diffraction Experiments - How to Avoid Ghost Stresses?
AU - Christiansen, Thomas
AU - Somers, Marcel A.J.
PY - 2004
Y1 - 2004
N2 - On evaluating lattice strain-depth or stress-depth profiles with X-ray diffraction, the variation of the information depth while combining various tilt angles,psi, in combination with lattice spacing gradients leads to artefacts,so-called ghost or fictitious stresses.
X-ray diffraction lattice-strain analysis was simulated for a model stress-depth profile combined with a composition-depth profile. Two principally different methods were investigated for the reconstruction of the actual stress and composition profiles from the simulated data:
- considering the stress/strain determined at a specific depth as a weighted average over the actual stress/strain depth profile
- considering the lattice spacing determined at a specific depth for a specific value for psi, as a weighted average over the actual lattice spacing profile for this psi-direction.
On the basis of the results it is possible to propose a preferred method for the evaluation of stress/strain and composition profiles, while minimising the risk for ghost stresses.
AB - On evaluating lattice strain-depth or stress-depth profiles with X-ray diffraction, the variation of the information depth while combining various tilt angles,psi, in combination with lattice spacing gradients leads to artefacts,so-called ghost or fictitious stresses.
X-ray diffraction lattice-strain analysis was simulated for a model stress-depth profile combined with a composition-depth profile. Two principally different methods were investigated for the reconstruction of the actual stress and composition profiles from the simulated data:
- considering the stress/strain determined at a specific depth as a weighted average over the actual stress/strain depth profile
- considering the lattice spacing determined at a specific depth for a specific value for psi, as a weighted average over the actual lattice spacing profile for this psi-direction.
On the basis of the results it is possible to propose a preferred method for the evaluation of stress/strain and composition profiles, while minimising the risk for ghost stresses.
KW - Materials technology
M3 - Journal article
VL - 443-444
SP - 91
EP - 94
JO - Materials Science Forum
JF - Materials Science Forum
SN - 0255-5476
ER -