Molecular Dynamics Simulation on Solidification Microstructure and Tensile Properties of Cu/SiC Composites

Area of Science:

• Materials Science
• Computational Materials Science

Background:

• Particle shape is a critical factor influencing the properties of metal matrix composites.
• Understanding the impact of ceramic particle shape on composite microstructure and mechanical behavior during cooling is essential for designing high-performance materials.

Purpose of the Study:

• To investigate the microstructure evolution mechanism in copper/silicon carbide (Cu/SiC) composites with varying SiC particle shapes during rapid solidification.
• To evaluate the mechanical properties of these composites after cooling.

Main Methods:

• Utilized molecular dynamics simulations to model the rapid solidification process.
• Analyzed microstructure evolution, including ordering and defect formation.
• Performed uniaxial tensile tests to assess mechanical properties post-solidification.

Main Results:

• Spherical SiC particles led to the highest degree of local ordering in the Cu/SiC composite after cooling.
• Increased ordering of face-centered-cubic and hexagonal-close-packed structures correlated with improved crystallization and fewer stacking faults.
• Composites with spherical SiC exhibited superior mechanical properties under uniaxial tensile stress.

Conclusions:

• The shape of SiC particles critically influences the microstructure and mechanical performance of Cu/SiC composites.
• Spherical SiC particles promote better crystallization and enhanced mechanical properties due to increased structural ordering.
• Findings offer insights for preparing and understanding Cu/SiC composites, guiding future experimental and theoretical research.