Constructing Reaction-Limited and Robust Interface in 2D MAB-Phase MoAlB Nanosheet-Reinforced Copper Matrix...

Area of Science:

• Materials Science
• Nanotechnology
• Composite Materials

Background:

• Molybdenum aluminum boride (MoAlB) shows promise for copper matrix composites but decomposes at high temperatures.
• This decomposition degrades mechanical properties and electrical conductivity.

Purpose of the Study:

• To prepare two-dimensional (2D) MoAlB nanosheets (NSs) for reinforcing copper matrix composites.
• To investigate the interfacial structure and properties of MoAlB NSs/Cu composites.
• To achieve enhanced mechanical and electrical performance in copper composites.

Main Methods:

• Preparation of 2D MoAlB NSs using viscous-solvent-assisted ball milling.
• Fabrication of MoAlB NSs/Cu composites via impregnation-reduction-sintering.
• Characterization of microstructural and property enhancements.

Main Results:

• A gradient interface structure formed between 2D MoAlB NSs and the copper matrix, limiting interfacial reactions.
• The composite exhibited significant grain refinement, efficient load transfer, and dislocation strengthening.
• 0.5 wt % MoAlB NSs/Cu composite achieved 333.3 MPa tensile strength and 92.6% IACS electrical conductivity.
• Composites showed excellent high-temperature softening resistance.

Conclusions:

• The developed 2D MoAlB NSs effectively reinforce copper matrix composites.
• The gradient interface structure is key to achieving a balance of superior mechanical and electrical properties.
• This approach offers a new strategy for designing advanced metal matrix composites.