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$High Pressure Single Crystal Diffraction at PX^2$

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Published on: January 16, 2017

Time-resolved x-ray diffraction techniques for bulk polycrystalline materials under dynamic loading.

P K Lambert¹, C J Hustedt¹, K S Vecchio²

¹Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.

The Review of Scientific Instruments

|October 3, 2014

Summary

This summary is machine-generated.

Researchers developed two time-resolved X-ray diffraction techniques for studying dynamic material deformation. These methods enable detailed analysis of elastic strains and texture in polycrystalline materials under high strain rates.

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Area of Science:

Materials Science
Condensed Matter Physics
Engineering Mechanics

Background:

Understanding material behavior under dynamic loading is crucial for engineering applications.
Traditional methods often lack the temporal resolution to capture rapid deformation processes.
In situ characterization of polycrystalline materials during high-rate events is challenging.

Purpose of the Study:

To develop and validate novel time-resolved X-ray diffraction techniques.
To enable in situ analysis of elastic strains and polycrystalline texture during dynamic loading.
To provide insights into material response at strain rates of 10^3–10^4 s⁻¹.

Main Methods:

Development of two synchronized X-ray diffraction techniques with a Kolsky bar apparatus.
Technique 1: Fast detector synchronization (70 ns exposure) with moderate X-ray energies (10–20 keV) for weakly absorbing materials.
Technique 2: High-energy X-rays (86 keV) and fast shutter (40 µs pulses) for strongly absorbing materials, using amorphous silicon detectors.

Main Results:

Successful implementation of two distinct time-resolved X-ray diffraction methods.
Demonstration of capability to capture in situ diffraction patterns during dynamic loading.
Presentation of sample data showing characterization of elastic strains and texture evolution over time.

Conclusions:

The developed techniques provide unprecedented temporal resolution for studying dynamic material deformation.
These methods are adaptable for various materials, including magnesium alloys, and different X-ray energy regimes.
The techniques offer a powerful tool for materials characterization under high-rate loading conditions.