Abstract
High energy 2D X-ray powder diffraction experiments are widely used for lattice strain measurement. The 2D to 1D conversion of diffraction patterns is a necessary step used to prepare the data for full pattern refinement, but is inefficient when only peak centre position information is required for lattice strain evaluation. The multi-step conversion process is likely to lead to increased errors associated with the 'caking' (radial binning) or fitting procedures. A new method is proposed here that relies on direct Digital Image Correlation analysis of 2D X-ray powder diffraction patterns (XRD-DIC, for short). As an example of using XRD-DIC, residual strain values along the central line in a Mg AZ31B alloy bar after 3-point bending are calculated by using both XRD-DIC and the conventional 'caking' with fitting procedures. Comparison of the results for strain values in different azimuthal angles demonstrates excellent agreement between the two methods. The principal strains and directions are calculated using multiple direction strain data, leading to full in-plane strain evaluation. It is therefore concluded that XRD-DIC provides a reliable and robust method for strain evaluation from 2D powder diffraction data. The XRD-DIC approach simplifies the analysis process by skipping 2D to 1D conversion, and opens new possibilities for robust 2D powder diffraction data analysis for full in-plane strain evaluation.
| Original language | English |
|---|---|
| Article number | 427 |
| Journal | Materials |
| Volume | 11 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 15 Mar 2018 |
Keywords
- 2D X-ray powder diffraction
- 3-point bending
- Digital Image Correlation
- Strainmeasurement
ASJC Scopus subject areas
- Materials Science(all)
Cite this
Digital image correlation of 2D X-ray powder diffraction data for lattice strain evaluation. / Zhang, Hongjia; Sui, Tan; Salvati, Enrico; Daisenberger, Dominik; Lunt, Alexander J.G.; Fong, Kai Soon; Song, Xu; Korsunsky, Alexander M.
In: Materials, Vol. 11, No. 3, 427, 15.03.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Digital image correlation of 2D X-ray powder diffraction data for lattice strain evaluation
AU - Zhang, Hongjia
AU - Sui, Tan
AU - Salvati, Enrico
AU - Daisenberger, Dominik
AU - Lunt, Alexander J.G.
AU - Fong, Kai Soon
AU - Song, Xu
AU - Korsunsky, Alexander M.
PY - 2018/3/15
Y1 - 2018/3/15
N2 - High energy 2D X-ray powder diffraction experiments are widely used for lattice strain measurement. The 2D to 1D conversion of diffraction patterns is a necessary step used to prepare the data for full pattern refinement, but is inefficient when only peak centre position information is required for lattice strain evaluation. The multi-step conversion process is likely to lead to increased errors associated with the 'caking' (radial binning) or fitting procedures. A new method is proposed here that relies on direct Digital Image Correlation analysis of 2D X-ray powder diffraction patterns (XRD-DIC, for short). As an example of using XRD-DIC, residual strain values along the central line in a Mg AZ31B alloy bar after 3-point bending are calculated by using both XRD-DIC and the conventional 'caking' with fitting procedures. Comparison of the results for strain values in different azimuthal angles demonstrates excellent agreement between the two methods. The principal strains and directions are calculated using multiple direction strain data, leading to full in-plane strain evaluation. It is therefore concluded that XRD-DIC provides a reliable and robust method for strain evaluation from 2D powder diffraction data. The XRD-DIC approach simplifies the analysis process by skipping 2D to 1D conversion, and opens new possibilities for robust 2D powder diffraction data analysis for full in-plane strain evaluation.
AB - High energy 2D X-ray powder diffraction experiments are widely used for lattice strain measurement. The 2D to 1D conversion of diffraction patterns is a necessary step used to prepare the data for full pattern refinement, but is inefficient when only peak centre position information is required for lattice strain evaluation. The multi-step conversion process is likely to lead to increased errors associated with the 'caking' (radial binning) or fitting procedures. A new method is proposed here that relies on direct Digital Image Correlation analysis of 2D X-ray powder diffraction patterns (XRD-DIC, for short). As an example of using XRD-DIC, residual strain values along the central line in a Mg AZ31B alloy bar after 3-point bending are calculated by using both XRD-DIC and the conventional 'caking' with fitting procedures. Comparison of the results for strain values in different azimuthal angles demonstrates excellent agreement between the two methods. The principal strains and directions are calculated using multiple direction strain data, leading to full in-plane strain evaluation. It is therefore concluded that XRD-DIC provides a reliable and robust method for strain evaluation from 2D powder diffraction data. The XRD-DIC approach simplifies the analysis process by skipping 2D to 1D conversion, and opens new possibilities for robust 2D powder diffraction data analysis for full in-plane strain evaluation.
KW - 2D X-ray powder diffraction
KW - 3-point bending
KW - Digital Image Correlation
KW - Strainmeasurement
UR - http://www.scopus.com/inward/record.url?scp=85044079926&partnerID=8YFLogxK
U2 - 10.3390/ma11030427
DO - 10.3390/ma11030427
M3 - Article
AN - SCOPUS:85044079926
VL - 11
JO - Materials
JF - Materials
SN - 1996-1944
IS - 3
M1 - 427
ER -