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Intermetallic eutectics with gigapascal strength and enhanced ductility

Gunjal, V and Tiwary, CS and Chattopadhyay, K and Banerjee, D (2024) Intermetallic eutectics with gigapascal strength and enhanced ductility. In: Intermetallics, 168 .

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Official URL: https://doi.org/10.1016/j.intermet.2024.108228


The Ni�Al�Zr system offers a variety of intermetallic eutectic combinations. Here, we demonstrate complex eutectic microstructures consisting of intermetallic i.e. Ni3Al�Ni7Zr2, NiAl�Ni7Zr2, and Ni3Al�NiAl�Ni7Zr2. We also developed alloys with different fractions of two eutectics i.e. Ni3Al�Ni7Zr2, NiAl�Ni7Zr2. These microstructures result in attractive combinations of ultra-high tensile strength of more than 1.5 GPa and are combined with 3�4 ductility and strength retention till 700 °C, which is better than most of the state of art super-alloys. The deformation behaviour along with fracture studies shows the role of individual intermetallic phases in the overall mechanical properties of the alloys. The transmission electron microscopy studies of the deformed samples show unique twinning in Ni7Zr2 intermetallic. © 2024 Elsevier Ltd

Item Type: Journal Article
Publication: Intermetallics
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to the Elsevier Ltd.
Keywords: Binary alloys; Ductility; Eutectics; High resolution transmission electron microscopy; Intermetallics; Microstructure; Nickel compounds; Tensile strength; Zircaloy, Deformation behavior; Enhanced ductility; Eutectic microstructure; Gigapascal; High-tensile strength; Mechanical characterizations; Strength retention; Super-alloys; Ternary eutectic alloys; Ultra-high, Solidification
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Apr 2024 10:28
Last Modified: 23 Apr 2024 10:28
URI: https://eprints.iisc.ac.in/id/eprint/84613

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