Elastic Energy Storage in Al-Al4C3 Composites: Effects of Dislocation Character and Interfacial Graphite Formation.
Audel Santos Beltrán1, Verónica Gallegos Orozco2, Hansel Manuel Medrano Prieto1
1Departamento de Nanotecnología, Universidad Tecnológica de Chihuahua Sur, Km. 3.5 Carr. Chihuahua a Aldama, Chihuahua 31313, Mexico.
Materials (Basel, Switzerland)
|January 10, 2026
Summary
This study reveals how microstructural features in Al-Al4C3 composites influence energy storage and toughness. Understanding dislocation character is key to enhancing energy absorption efficiency and improving material properties.
Area of Science:
- Materials Science
- Mechanical Engineering
- Nanotechnology
Background:
- Aluminum-Aluminum Carbide (Al-Al4C3) composites offer high specific strength and stiffness.
- High reinforcement content in these composites can lead to brittle behavior, limiting toughness.
- Understanding energy storage mechanisms is crucial for improving the mechanical performance of Al-Al4C3 composites.
Purpose of the Study:
- To investigate the energy storage capacity and mechanical properties of Al-Al4C3 composites.
- To correlate microstructural parameters with energy storage and absorption efficiency.
- To develop a predictive model for stored elastic energy.
Main Methods:
- Fabrication of Al-Al4C3 composites via mechanical milling and heat treatment.
- Microstructural characterization using X-ray Diffraction (XRD) and Convolutional Multiple Whole Profile (CMWP) fitting to determine dislocation density, character, and effective outer cut-off radius.
- Mechanical testing through compression tests to quantify stored elastic energy (Es) and energy absorption efficiency (EAE).
- High-resolution transmission electron microscopy (HRTEM) for detailed microstructural analysis.
Main Results:
- Microstructural parameters (dislocation density, character, and effective outer cut-off radius) were quantified after fabrication.
- A predictive model relating stored elastic energy (Es) to initial stored energy (Ee) and dislocation character (q) was developed.
- Samples with high energy absorption efficiency (EAE) showed a prevalence of screw-character dislocations.
- HRTEM revealed graphite regions promoting screw dislocation formation and stacking faults, enhancing energy redistribution and toughness.
Conclusions:
- Dislocation character, particularly screw dislocations, plays a critical role in the energy storage and absorption efficiency of Al-Al4C3 composites.
- Mechanisms involving screw dislocations, dissociation, and stacking faults contribute to improved toughness by enhancing energy redistribution.
- The findings provide insights into optimizing the microstructure of Al-Al4C3 composites for enhanced mechanical performance and toughness.
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