Neutron-Absorption Properties of B/Cu Composites

Area of Science:

• Materials Science
• Nuclear Engineering

Background:

• Copper's high conductivity makes it vital for structural and functional materials.
• Powder metallurgy is a key technique for creating advanced metal matrix composites.

Purpose of the Study:

• To synthesize boron dispersion-enhanced copper matrix composites using powder metallurgy.
• To investigate the neutron-absorption characteristics and hardness of these composites.
• To analyze the relationship between neutron energy, boron content, and absorption cross-section.

Main Methods:

• Powder metallurgy for composite fabrication.
• Neutron-absorption cross-section analysis across varying neutron energies.
• Nanoindentation testing for hardness measurement.

Main Results:

• A coherent interface between copper and boron was formed without lattice distortion.
• Neutron absorption cross-section decreases exponentially with increasing neutron energy.
• Enhanced neutron absorption was observed with increased boron content and 10B abundance at low neutron energies (<0.1 eV).
• Composite hardness reached approximately 3.04 GPa.

Conclusions:

• Boron dispersion-strengthened copper matrix composites exhibit excellent neutron-absorption capacity and high hardness.
• Microstructure and boron size do not impact neutron absorption performance at consistent boron content.
• These composites are promising for applications needing both neutron absorption and mechanical strength.