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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
Published on: June 19, 2018
Time- and angle-resolved x-ray diffraction to probe structural and chemical evolution during Al-Ni intermetallic
Choong-Shik Yoo1, Haoyan Wei, Jing-Yin Chen
1Department of Chemistry, Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USA. csyoo@wsu.edu
The Review of Scientific Instruments
|December 2, 2011
Summary
We developed a new time- and angle-resolved x-ray diffraction (TARXD) technique to study fast reactions. This method tracks structural changes during exothermic intermetallic reactions in Ni-Al multilayers with high time resolution.
Area of Science:
- Materials Science
- Chemical Engineering
- Physics
Background:
- Understanding rapid exothermic reactions is crucial for materials synthesis and safety.
- Previous methods lacked the time resolution to capture fast structural and chemical changes.
- Nickel-Aluminum (Ni-Al) multilayers exhibit rapid intermetallic reactions.
Purpose of the Study:
- To present a novel time- and angle-resolved x-ray diffraction (TARXD) system.
- To probe structural and chemical evolutions during fast exothermic intermetallic reactions.
- To characterize the reaction dynamics in Ni-Al multilayers.
Main Methods:
- Utilized monochromatic synchrotron x-rays and a 2D pixel array detector.
- Employed a fast-rotating diffraction beam chopper for high time resolution (~30 μs).
- Integrated a high-speed camera and optical pyrometer for temperature and speed measurements.
Main Results:
- Achieved continuous recording of diffraction images over 3 ms with ~30 μs resolution.
- Measured reaction propagation speed (7.6 m/s), adiabatic heating rate (4.0 × 10^6 K/s), and cooling rate (4.5 × 10^4 K/s).
- Observed rapid NiAl alloy formation (<45 μs), determined NiAl thermal expansion coefficient (1.1 × 10^-6 K), and noted crystallization of V and Ag3In.
Conclusions:
- The novel TARXD system effectively captures rapid structural and chemical transformations.
- Provided detailed insights into the kinetics and thermodynamics of exothermic Ni-Al reactions.
- Demonstrated the capability to study fast material evolutions in situ.
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