Chamber for mechanical testing in H₂ with observation by neutron scattering

Area of Science:

• Materials Science
• Neutron Scattering Physics
• Mechanical Engineering

Background:

• Neutron scattering is crucial for understanding material properties.
• In situ measurements under mechanical load and pressure are challenging.
• Existing facilities require specialized sample environments.

Purpose of the Study:

• To design and build a versatile gas-pressure chamber for neutron scattering.
• To enable in situ mechanical loading of steel specimens.
• To demonstrate advanced neutron imaging capabilities.

Main Methods:

• Designed and constructed a gas-pressure chamber (3.4 MPa / 500 psi).
• Integrated mechanical loading capabilities for steel specimens.
• Utilized user facilities at NIST and SNS for neutron scattering experiments.

Main Results:

• Successfully tested the gas-pressure chamber at moderate pressures.
• Demonstrated compatibility with existing load frames.
• Presented a successful demonstration of neutron Bragg edge imaging.

Conclusions:

• The developed chamber facilitates a range of in situ neutron scattering techniques.
• It enhances the capability for studying materials under combined mechanical and pressure conditions.
• The device expands research possibilities at major neutron scattering facilities.