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Influence of heat treatment on metallurgical and mechanical properties of aluminium Al6061 hybrid metal matrix composites

  • A. Devaenthiran Pradeep

    A. Devaenthiran Pradeep, born in 1988, completed graduation in Mechanical Engineering at PSG college of technology, Anna University, India. In 2015, he joined as Assistant professor in Department of Mechanical Engineering, Bannari Amman Institute of Technology. Currently associated with “Materials characterization” research group, he is pursuing his doctoral research in metal matrix hybrid composite materials.

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    and Thirupathi Rameshkumar

    Dr. Thirupathi Rameshkumar, born in 1979, graduated in Mechanical Engineering at Bharathiyar university, India, in 2000. He started his career in teaching during 2002 and joined Bannari Amman Institute of Technology in 2006. In 2014, he presented his doctoral thesis on “Development and characterization of plain bearing materials for automotive applications” at Anna University, India. His research interests include Tribology and Mechanical Properties Testing and is currently associated with “Materials characterization” research group and working as Professor in Department of Mechanical Engineering.

Published/Copyright: October 15, 2024
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Abstract

The current investigation explores the metallurgical and mechanical properties of hybrid metal matrix composites (HMMC) with aluminum 6061 as the base material, reinforced with ceramic of tungsten carbide (WC) nanoparticles, graphite (as a solid lubricant) and redmud (RM). Four different composites with tungsten carbide nanoparticles (1.5 wt.%) and graphite (2 wt.%) with a varying proportions of redmud (0, 1, 3 and 5 wt.%) are fabricated by stir casting. Microscopic analysis reveals grain boundary with segregations, some of which dissolve to form discontinuous grain boundaries after heat treatment. FESEM examination shows the formation of intermetallic, some of which dissolve on heat treatment to form precipitate that are distributed evenly along the grain boundary and also inside grains. EDX mapping further validated the uniform distribution of reinforcements without any agglomeration. The addition of reinforcements and heat treatment (T6) resulted in substantial improvements in hardness, ultimate tensile strength, yield strength, and compressive strength compared to unreinforced Al6061 and untreated HMMC, respectively. Fractographic analysis of tensile tested samples reveals the presence of dimples, tearing edges and small voids, indicating ductile fracture.


Corresponding author: A. Devaenthiran Pradeep, Department of Mechanical Engineering, Bannari Amman Institute of Technology, Sathyamangalam, 638401, India, E-mail:

About the authors

A. Devaenthiran Pradeep

A. Devaenthiran Pradeep, born in 1988, completed graduation in Mechanical Engineering at PSG college of technology, Anna University, India. In 2015, he joined as Assistant professor in Department of Mechanical Engineering, Bannari Amman Institute of Technology. Currently associated with “Materials characterization” research group, he is pursuing his doctoral research in metal matrix hybrid composite materials.

Thirupathi Rameshkumar

Dr. Thirupathi Rameshkumar, born in 1979, graduated in Mechanical Engineering at Bharathiyar university, India, in 2000. He started his career in teaching during 2002 and joined Bannari Amman Institute of Technology in 2006. In 2014, he presented his doctoral thesis on “Development and characterization of plain bearing materials for automotive applications” at Anna University, India. His research interests include Tribology and Mechanical Properties Testing and is currently associated with “Materials characterization” research group and working as Professor in Department of Mechanical Engineering.

  1. Research ethics: Not applicable.

  2. Informed consent: Not applicable.

  3. Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interests: The authors state no conflict of interest

  6. Research funding: None declared

  7. Data availability: The raw data can be obtained on request from the corresponding author.

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Published Online: 2024-10-15
Published in Print: 2024-12-17

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