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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
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CONNECTION BETWEEN STRENGTH AND THERMAL CONDUCTIVITY OF METAL MATRIX COMPOSITES WITH UNIFORM DISTRIBUTION OF GRAPHITE
Aref Mazloum1, Valerio Oddone2, Stephanie Reich2
1Department of Mechanical and Aerospace Engineering, New Mexico State University Las Cruces, NM 88001, USA.
International Journal of Engineering Science
|March 15, 2021
Summary
This study reveals a direct link between thermal conductivity and strength in metal matrix composites reinforced with graphite flakes. Understanding flake spacing helps predict composite performance, optimizing material design.
Area of Science:
- Materials Science
- Mechanical Engineering
- Solid Mechanics
Background:
- Metal matrix composites (MMCs) are crucial for advanced applications.
- Graphite flakes are used as reinforcement in MMCs.
- Understanding the relationship between thermal and mechanical properties is essential for material design.
Purpose of the Study:
- To establish a cross-property connection between thermal conductivity and strength in graphite flake-reinforced MMCs.
- To analyze stress concentration as a function of graphite flake distribution.
- To validate theoretical models with experimental data.
Main Methods:
- Combined theoretical modeling and experimental analysis.
- Investigated aluminum alloy (Al2024) and magnesium alloy (Mg-0.9Ca) composites.
- Analyzed maximal stress concentration based on minimal distance between graphite flakes.
Main Results:
- A direct relationship between thermal conductivity and composite strength was established by eliminating the volume fraction parameter.
- Theoretical predictions showed excellent agreement with experimental observations.
- Minimal distance between graphite flakes was linked to stress concentration and thermal conductivity.
Conclusions:
- A simplified model provides accurate predictions for MMCs with uniformly distributed, similarly shaped inhomogeneities.
- The findings enable optimized design of MMCs by correlating thermal and mechanical properties.
- This work offers a pathway to enhance the performance of metal matrix composites.
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