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Dry sliding wear behavior of AA7075 alloy produced by thixocasting

  • Hudaverdi Bilgen

    Mr. Hudaverdi Bilgen was born in 1978 and works at the FNSS Defense Systems Inc., Ankara, Turkey. He received his BSc degree from the Department of Metallurgy Education, Gazi University, in 2000. He received his MSc degree from Gazi University in 2022. His areas of interest include tribology, semi-solid metal processing, and computer-aided design.

         , Omer Sahin

    Mr. Omer Sahin was born in 1988 and works at the Department of Metallurgical and Materials Engineering, Gazi University, Ankara, Turkey. He received his BSc and MSc degrees from the Department of Metallurgical and Materials Engineering, Karadeniz Technical University, in 2015 and 2018, respectively. His research interests include heat treatments of steels and cast irons, materials characterization, and mechanical tests.

         , Neset Akar

    Assoc. Prof. Dr. Neset Akar was born in 1973 and works at the Department of Metallurgical and Materials Engineering, Gazi University, Ankara, Turkey. He graduated from the Department of Metallurgy Education from Gazi University in 1996. He received his MSc and PhD degrees from Gazi University in 2000 and 2006. His research interests include casting technologies, computer-aided casting design, and semi-solid processing of aluminum alloys.

         and Volkan Kilicli

    Assoc. Prof. Dr. Volkan Kilicli was born in 1980 and works at the Department of Metallurgical and Materials Engineering, Gazi University, Ankara, Turkey. He graduated from the Department of Metallurgy Education from Gazi University in 2001. He received his MSc and PhD degrees from Gazi University in 2004 and 2010. His research interests include heat treatments of steels and cast irons, semi-solid processing of aluminum alloys, self-healing metallic materials, and metal matrix composites.

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Published/Copyright: November 28, 2023
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Materials Testing
From the journal Materials Testing Volume 66 Issue 1

Abstract

In this study, the wear behavior of AA7075 alloy produced by thixocasting was investigated. The wear behavior of the AA7075 alloy is examined for three cases: extruded with T6 heat treatment, as-thixocast, and thixocast with T6 conditions. The dry sliding wear test was conducted with a tribometer according to ASTM G-99 standard. The microstructures were characterized by optical microscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDX). The tensile and hardness tests were performed to evaluate the mechanical properties. The AA7075 alloy was successfully shaped by thixocasting. The as-thixocast sample exhibited typical globular structures with multinary eutectic structures along the grain boundaries. The globular grains transform into a polygonal structure, and the grain size increases from 50 μm to 60 μm in the thixocast + T6 sample. This microstructure exhibited excellent wear resistance under dry sliding conditions in the thixocast + T6 sample. The aging treatment with prolonged solution process improved the mechanical properties two times and the wear rate three times for the thixocast AA7075 alloy. Furthermore, the thixocast + T6 sample exhibited a significant decrease in the coefficient of friction with the lowest wear rate compared to the as-thixocast sample. The dominant wear mechanisms are microdelamination, adhesion, and oxidation in all samples.

Keywords: AA7075 alloy; wear behavior; semi-solid metal processing; thixocasting; T6 heat treatment
Corresponding author: Volkan Kilicli, Department of Metallurgical and Materials Engineering, Faculty of Technology, Gazi Universitesi, Ankara, 06560, Türkiye, E-mail:

Funding source: Devlet Planlama Teskilati

Award Identifier / Grant number: 2003K120470-27

About the authors

Hudaverdi Bilgen

Mr. Hudaverdi Bilgen was born in 1978 and works at the FNSS Defense Systems Inc., Ankara, Turkey. He received his BSc degree from the Department of Metallurgy Education, Gazi University, in 2000. He received his MSc degree from Gazi University in 2022. His areas of interest include tribology, semi-solid metal processing, and computer-aided design.

Omer Sahin

Mr. Omer Sahin was born in 1988 and works at the Department of Metallurgical and Materials Engineering, Gazi University, Ankara, Turkey. He received his BSc and MSc degrees from the Department of Metallurgical and Materials Engineering, Karadeniz Technical University, in 2015 and 2018, respectively. His research interests include heat treatments of steels and cast irons, materials characterization, and mechanical tests.

Neset Akar

Assoc. Prof. Dr. Neset Akar was born in 1973 and works at the Department of Metallurgical and Materials Engineering, Gazi University, Ankara, Turkey. He graduated from the Department of Metallurgy Education from Gazi University in 1996. He received his MSc and PhD degrees from Gazi University in 2000 and 2006. His research interests include casting technologies, computer-aided casting design, and semi-solid processing of aluminum alloys.

Volkan Kilicli

Assoc. Prof. Dr. Volkan Kilicli was born in 1980 and works at the Department of Metallurgical and Materials Engineering, Gazi University, Ankara, Turkey. He graduated from the Department of Metallurgy Education from Gazi University in 2001. He received his MSc and PhD degrees from Gazi University in 2004 and 2010. His research interests include heat treatments of steels and cast irons, semi-solid processing of aluminum alloys, self-healing metallic materials, and metal matrix composites.

Acknowledgments

The authors would like to thank the Gazi University Department of Metallurgical and Materials Engineering for laboratory facilities.

  1. Research ethics: The authors declare that no AI writing tools were used in this paper. Not applicable.

  2. Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission. Hudaverdi Bilgen: Experimental studies (wear test, machining of the test samples), creating figures, and paper writing. Omer Sahin: Experimental studies (microstructural characterization and mechanical tests), creating figures, and paper writing. Neset Akar: Experimental studies (thixocasting), paper writing, and editing. Volkan Kilicli: Conceptualization, paper writing, editing, and review.

  3. Competing interests: The authors state no conflict of interest.

  4. Research funding: This study was financially supported by the Devlet Planlama Teskilati (DPT Project Number: 2003K120470-27).

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

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Published Online: 2023-11-28
Published in Print: 2024-01-29

© 2023 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/mt-2023-0338
Keywords for this article
AA7075 alloy; wear behavior; semi-solid metal processing; thixocasting; T6 heat treatment

Articles in the same Issue

  1. Frontmatter
  2. Performance of additively manufactured Ti6Al4V ELI finger joints: biomechanical testing and evaluation for arthritis management
  3. Mechanical and microstructural characterization of resistance spot welded dissimilar TWIP1000/TRIP800 joints
  4. Effect of particle size on the properties of avocado pear wood fiber/low-density polyethylene composite enhanced by pretreatment
  5. Design optimization of hybrid material B-pillar under crush loading
  6. Pack-boriding of Sleipner steel: microstructure analysis and kinetics modeling
  7. Structural comparison of conventional and chiral auxetic morphed aircraft rib
  8. Compression behavior of the wood-inspired cellular structure of acrylonitrile butadiene styrene
  9. Adhesive wear behavior and microstructure of FeCr–FeMn–FeB–C coatings
  10. Dry sliding wear behavior of AA7075 alloy produced by thixocasting
  11. Effects of compaction pressure on microstructure, mechanical properties, and machining characteristics of sintered AISI 316L steel
  12. Investigation of the effects of halloysite nanoclay on friction and wear behavior of automotive brake pads
  13. Identifying stir casting process parameters to maximize strength of LM13 with TiB2 and ZrC hybrid metal matrix composite
  14. Effect of gas metal arc and cold metal transfer arc welding processes on microstructure and mechanical properties of AA8011-H18 alloy joints
  15. Anisotropy effects on the tensile properties of AA5052 and AA5052-PVC-AA5052 sandwich sheets
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