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Strain rate sensitivity and deformation mechanism of nano-lamellar γ-Ni/Ni5Zr eutectic at room temperature

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Abstract

The strain rate sensitivity (m) of (Ni0.92Zr0.08)100−xAlx (0 ≤ x ≤ 4 at.%) eutectic with varying average lamellae thickness (λw) in the range of 39–275 nm has been investigated in the strain rate range of 8 × 10−5 and 8 × 10−3 s−1 at room temperature. The microstructure of the nano-/ultrafine eutectic composites (NECs) is comprised of alternate lamellae of fcc γ-Ni and Ni5Zr along with 20–31 vol% γ-Ni dendritic phase. The m value of all the investigated NECs lies between 0.0080 and 0.0102, whereas the activation volume (V*) has been estimated to be between 29.7b3 and 49.8b3. High-resolution transmission electron microscopy studies confirm the dislocation-mediated plastic flow including dislocation–lamellae interaction, and their pile-up at the interface, which result in the narrow variation of m for a wide range of λw due to its interlocked lamellar microstructure. A mathematical model has been developed to correlate the m with λw for the experimented NECs with wide microstructure length scale and solute content.

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Acknowledgments

The authors acknowledge the technical support of M. Das, S. Maity, and R. Kundu at Central Research Facility, IIT Kharagpur. The authors further acknowledge the Naval Research Board, GOI (NRB/4003/PG/357), and IIT Kharagpur SRIC (SGIRG) for financial support.

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  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India

    Anushree Dutta & Jayanta Das

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  1. Anushree Dutta
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Correspondence to Jayanta Das.

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Dutta, A., Das, J. Strain rate sensitivity and deformation mechanism of nano-lamellar γ-Ni/Ni5Zr eutectic at room temperature. Journal of Materials Research 35, 2777–2788 (2020). https://doi.org/10.1557/jmr.2020.188

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