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Indentation creep behavior of Fe–8Ni–xZr oxide dispersion strengthened alloys

  • Mustafa Tekin

    Mustafa Tekin completed his BSc degree at İstanbul Technical University, İstanbul, in 2014 and MSc degree at İstanbul Technical University, İstanbul, in 2017. He received his PhD degree in Mechanical Engineering from Necmettin Erbakan University, Konya, Turkey, in 2022. He is working as an Assistant Professor at KTO Karatay University in Konya. His research interests are mechanical alloying, thermal stability, high entropy alloys, material testing, nanoindentation, and nanocrystalline metals.

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    , Faiz Muhaffel

    Faiz Muhaffel completed his BSc degree at İstanbul Technical University, İstanbul, in 2008 and MSc degree at İstanbul Technical University, İstanbul, in 2010. He received his PhD degree in Materials Science and Engineering at İstanbul Technical University, İstanbul, Turkey, in 2021. His research interests are metallurgical engineering, wear behavior of materials, micro arc oxidation, nanoindentation, and material testing.

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    , Hasan Kotan

    Professor Hasan Kotan completed his BSc degree at Sakarya University, Sakarya, in 2006 and MSc degree at University of Pittsburgh, Pennsylvania, in 2010. He received his PhD degree in Materials Science and Engineering from North Carolina State University, North Carolina, USA, in 2013. His research interests are nanocrystalline metals, stainless steel, thermal stability, mechanical alloying, and thermal stability.

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    and Murat Baydoğan

    Professor Murat Baydoğan completed his BSc degree at İstanbul Technical University, Sakarya Engineering Faculty, Sakarya, in 1992 and MSc degree at İstanbul Technical University, İstanbul, in 1996. He received his PhD degree in Materials Science and Engineering at İstanbul Technical University, İstanbul, Turkey, in 2003. He is working as a professor at Istanbul Technical University. His research interests are metallurgical and materials engineering, wear behavior of materials, micro arc oxidation, microstructural characterization of materials, nanoindentation, and material testing.

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Published/Copyright: July 20, 2023
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Abstract

This study was conducted to understand the creep behavior of two oxide dispersion strengthened alloys containing Zr as the alloying addition by performing indentation creep tests at room temperature. The oxide dispersion strengthened alloys were Fe–8Ni–xZr (x = 1 and 4 at.%, i.e., Zr-1 and Zr-4 alloys, respectively), which had been previously fabricated by mechanical alloying; followed by consolidation via equal channel angular extrusion at 1000 °C. The indentation tests were conducted under a maximum load of 100 mN with the loading rates at 300 and 400 mN min−1. The hardness was calculated by the Oliver–Pharr method, and the creep properties, such as the creep displacement, creep strain rate, creep stress, and stress exponent n, were determined. The results showed that the Zr-4 alloy was harder than the Zr-1 alloy. However, the creep resistance of the Zr-1 alloy was better than that of the Zr-4 alloy. It was further demonstrated that both the hardness and creep resistance depended on the loading rate. Moreover, a possible creep mechanism was proposed. Although the tests were performed at room temperature, they can provide insight into the effect of an oxide dispersion strengthened alloys microstructure on creep at higher temperatures.


Corresponding author: Murat Baydoğan, Department of Metallurgical and Materials Engineering, Istanbul Technical University, 34469 Maslak, İstanbul, Türkiye, E-mail:

About the authors

Mustafa Tekin

Mustafa Tekin completed his BSc degree at İstanbul Technical University, İstanbul, in 2014 and MSc degree at İstanbul Technical University, İstanbul, in 2017. He received his PhD degree in Mechanical Engineering from Necmettin Erbakan University, Konya, Turkey, in 2022. He is working as an Assistant Professor at KTO Karatay University in Konya. His research interests are mechanical alloying, thermal stability, high entropy alloys, material testing, nanoindentation, and nanocrystalline metals.

Faiz Muhaffel

Faiz Muhaffel completed his BSc degree at İstanbul Technical University, İstanbul, in 2008 and MSc degree at İstanbul Technical University, İstanbul, in 2010. He received his PhD degree in Materials Science and Engineering at İstanbul Technical University, İstanbul, Turkey, in 2021. His research interests are metallurgical engineering, wear behavior of materials, micro arc oxidation, nanoindentation, and material testing.

Hasan Kotan

Professor Hasan Kotan completed his BSc degree at Sakarya University, Sakarya, in 2006 and MSc degree at University of Pittsburgh, Pennsylvania, in 2010. He received his PhD degree in Materials Science and Engineering from North Carolina State University, North Carolina, USA, in 2013. His research interests are nanocrystalline metals, stainless steel, thermal stability, mechanical alloying, and thermal stability.

Murat Baydoğan

Professor Murat Baydoğan completed his BSc degree at İstanbul Technical University, Sakarya Engineering Faculty, Sakarya, in 1992 and MSc degree at İstanbul Technical University, İstanbul, in 1996. He received his PhD degree in Materials Science and Engineering at İstanbul Technical University, İstanbul, Turkey, in 2003. He is working as a professor at Istanbul Technical University. His research interests are metallurgical and materials engineering, wear behavior of materials, micro arc oxidation, microstructural characterization of materials, nanoindentation, and material testing.

Acknowledgment

The authors are particularly indebted to Dr. Kris A. Darling for conducting ECAE.

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

  2. Research funding: None declared.

  3. Competing interests: On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Published Online: 2023-07-20
Published in Print: 2023-09-26

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