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Effect of cooling rate and composition on the microstructure and mechanical properties of (Ni0.92Zr0.08)100−xAlx (0 ≤ x ≤ 4 at.%) ultrafine eutectic composites

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Abstract

The effect of cooling rate on the microstructure evolution and the mechanical properties of ingots and rods of 2–5 mm diameter of (Ni0.92Zr0.08)100−xAlx (0 ≤ x ≤ 4 at.%) ultrafine eutectic composites have been investigated. The microstructure of the composites is comprised of micrometer size γ-Ni dendrites embedded in a nano/-ultrafine lamellar fcc γ-Ni and Ni5Zr matrix. The evolution of the microstructure at a wide range of cooling rates (10–104 K/s) has been analyzed in respect of volume fraction of the phases, lamellar spacing, and secondary dendritic arm spacing. All these composites exhibit high hardness up to 4.6 GPa and yield strength up to 1.6 GPa with large compressive plasticity up to 22% at room temperature. The effect of cooling rates on the strength and hardness, and the plasticity of the nanolamellar composites with wide range of alloy composition have been correlated.

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Acknowledgments

The authors thank M. Das, S. Maity, and R. Kundu at the CRF at IIT Kharagpur for technical assistance. The financial support provided by Naval Research Board (NRB/4003/PG/357), Government of India, and SRIC (SGIRG), IIT Kharagpur are gratefully acknowledged.

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Authors and Affiliations

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

    Anushree Dutta, Parijat P. Jana & Jayanta Das

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  1. Anushree Dutta
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  2. Parijat P. Jana
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  3. Jayanta Das
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Correspondence to Jayanta Das.

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Dutta, A., Jana, P.P. & Das, J. Effect of cooling rate and composition on the microstructure and mechanical properties of (Ni0.92Zr0.08)100−xAlx (0 ≤ x ≤ 4 at.%) ultrafine eutectic composites. Journal of Materials Research 34, 1704–1713 (2019). https://doi.org/10.1557/jmr.2019.49

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