X-ray diffraction evaluation of stress in high pressure deformation experiments

Area of Science:

• Materials Science
• Geophysics
• Solid Mechanics

Background:

• X-ray diffraction (XRD) is a powerful technique for analyzing material structures.
• Understanding stress in materials under high pressure is crucial for various scientific and engineering fields.

Purpose of the Study:

• To evaluate the use of X-ray diffraction for measuring stress in high-pressure deformation experiments.
• To model elastic lattice strains in different experimental setups.

Main Methods:

• Modeling elastic lattice strains for axial and rotational deformation apparatus.
• Inverting stress from X-ray diffraction data.
• Comparing model results with experimental data.

Main Results:

• Stress can be successfully inverted from X-ray diffraction data in most high-pressure deformation scenarios.
• Elastic models of lattice strains may not adequately account for the influence of plastic deformation.
• Experimental data suggests plastic deformation impacts lattice strain measurements.

Conclusions:

• X-ray diffraction is applicable for stress determination in high-pressure deformation.
• Caution is advised when interpreting lattice strain data, as plastic deformation effects need further consideration.
• Refined models incorporating plasticity are needed for accurate stress analysis.