Cold neutron diffraction contrast tomography of polycrystalline material.

Area of Science:

• Materials Science
• Physics
• Engineering

Background:

• Traditional neutron imaging uses neutron beam attenuation for material distribution analysis.
• Existing methods do not utilize diffracted neutrons, limiting crystallographic information.
• Non-destructive imaging techniques are crucial for material characterization.

Purpose of the Study:

• To expand traditional neutron imaging by incorporating diffracted neutrons.
• To develop a novel technique for crystallographic distribution and grain mapping.
• To enable the study of large grains in bulky metallic structures.

Main Methods:

• Cold neutron diffraction contrast tomography was developed and applied.
• Samples were rotated in a cold neutron beam with a limited wavelength band.
• Diffracted neutron projections were captured to determine crystallite orientation and reconstruct grain shape.

Main Results:

• The technique successfully obtained crystallographic distributions (grain mapping).
• Grain shapes were reconstructed from diffracted neutron projections.
• Experimental comparison with synchrotron diffraction contrast tomography was performed on recrystallized aluminum.

Conclusions:

• Cold neutron diffraction contrast tomography provides detailed crystallographic information.
• The method is suitable for analyzing large grains in bulky metallic materials.
• This technique offers a new avenue for non-destructive material characterization.