Study on Material Removal Mechanism of Non-Resonant Vibration-Assisted Scratching High-Volume Fraction SiCp/Al

Area of Science:

• Materials Science
• Mechanical Engineering
• Nanotechnology

Background:

• Aluminum-based silicon carbide (SiCp/Al) composites are challenging to machine due to their hard particle distribution.
• Machining quality of SiCp/Al is significantly impacted by particle volume fraction and removal mechanisms.
• Understanding material removal is crucial for improving the surface quality of these advanced composites.

Purpose of the Study:

• To investigate the influence of vibration frequency on the material removal mechanism and plastic deformation in high-volume fraction SiCp/Al composites.
• To elucidate the role of non-resonant vibration-assisted scratching (NVAS) in enhancing machinability.
• To correlate experimental observations with molecular dynamics (MD) simulation insights.

Main Methods:

• Utilized non-resonant vibration-assisted scratching (NVAS) experiments on SiCp/Al composites.
• Employed molecular dynamics (MD) simulations to model the scratching process at the atomic level.
• Varied vibration frequencies to analyze their effect on material removal and deformation.

Main Results:

• NVAS significantly expands the plastic removal area and reduces scraping force compared to conventional scraping (CS).
• Increased vibration frequency in NVAS leads to smoother scratched grooves and more uniform dislocation distribution.
• MD simulations confirmed that higher frequencies reduce dislocation loops and HCP structures, promoting plastic deformation.

Conclusions:

• Non-resonant vibration-assisted scratching is an effective method for improving the machinability of high-volume fraction SiCp/Al composites.
• Vibration frequency is a critical parameter influencing the plastic deformation and removal mechanisms during machining.
• This research provides a fundamental understanding for optimizing NVAS processes for difficult-to-machine materials.