Preparation of Structure-Function Integrated Layered CNT/Mg Composites

Area of Science:

• Materials Science
• Composite Materials
• Nanotechnology

Background:

• Magnesium (Mg)-matrix composites offer excellent damping and electromagnetic shielding but suffer from a strength-toughness mismatch.
• This limitation hinders their widespread application in various engineering fields.

Purpose of the Study:

• To address the strength-toughness imbalance in Mg-matrix composites.
• To maintain desirable functional properties while enhancing mechanical performance.
• To develop high-performance, structure-function integrated Mg-based materials.

Main Methods:

• Carbon nanotubes (CNTs) were uniformly dispersed on Mg foil using electrophoretic deposition (EPD).
• Spark plasma sintering (SPS) was employed for consolidation.
• Hot rolling deformation was applied to refine grain structure and enhance interlayer bonding.

Main Results:

• CNT/Mg laminates exhibited a 6.4% increase in tensile strength and a 108.4% increase in elongation compared to pure Mg.
• The laminate structure significantly improved toughness by increasing energy absorption during crack propagation.
• Optimal properties were achieved at 80% total rolling deflection, yielding a tensile strength of 241.70 MPa and elongation of 6.90%.

Conclusions:

• The developed CNT/Mg laminates overcome the strength-toughness mismatch, offering enhanced mechanical properties.
• Microstructural modifications through EPD, SPS, and hot rolling are crucial for optimizing composite performance.
• The study presents a viable approach for creating advanced Mg-based materials with integrated structural and functional characteristics.