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Microstructure and Mechanical Properties of Arc-Melted NiSi11Cx Alloys

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TMS 2023 152nd Annual Meeting & Exhibition Supplemental Proceedings (TMS 2023)

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

Functional materials such as nickel silicides (Ni3Si) are considered promising materials for building complex and strong structures. They have proven to have a high melting point, low electronic resistivity, excellent corrosion resistance, and thermally stability, however, their overall performances are still challenging due to their brittleness. Therefore, it is essential to prepare high-strength nickel silicide-based materials to improve their toughness. In the present study, arc melting has been utilized to synthesize nickel silicide (NiSi11, wt%) and carbon (C) alloyed nickel silicide (NiSi11Cx, x = 0.2, 1 wt%) with varying amounts of C aiming to improve the microstructure and mechanical properties of the alloy. The NiSi11 and NiSi11Cx alloys were characterized by Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), and microhardness tests. Results show that the NiSi11 alloy comprises lamellar-like eutectic Ni3Si and Ni solid solution phases. After alloying with C, the microstructure of the Ni-rich solid solution and Ni3Si phase is changed to a relatively fine-scale morphology, and C is mainly dissolved in the Ni-rich solid solution phase. The microhardness of the alloys is increased with the addition of C, which is mainly attributed to the microstructure refinement and solid solution strengthening obtained through C addition.

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Acknowledgements

The present study was possible due to the funding received through the MADAM (Development and Production of Metal Alloys for Powder-Based Additive Manufacturing) project from the Norwegian Research Council (NFR), Ref. no. 309856. The authors wish to acknowledge the help received from ELKEM, R&D Center, Kristiansand, Norway, for providing technical support and materials, as well as SINTEF Industry, Oslo, Norway, for providing the opportunity to use the arc melter for alloy fabrication.

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Authors and Affiliations

  1. Department of Engineering and Sciences, Faculty of Engineering Sciences, University of Agder (UiA), Grimstad, Norway

    Foysal Kabir Tareq, Ragnhild E. Aune & Geir Grasmo

  2. SINTEF Industry, Oslo, Norway

    Even Wilberg Hovig

  3. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway

    Ragnhild E. Aune

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  1. Foysal Kabir Tareq
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  2. Even Wilberg Hovig
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  3. Ragnhild E. Aune
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  4. Geir Grasmo
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Correspondence to Foysal Kabir Tareq .

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    Tareq, F.K., Hovig, E.W., Aune, R.E., Grasmo, G. (2023). Microstructure and Mechanical Properties of Arc-Melted NiSi11Cx Alloys. In: TMS 2023 152nd Annual Meeting & Exhibition Supplemental Proceedings. TMS 2023. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-22524-6_21

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