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Microstructure and Corrosion Behavior of Hf-40 Wt Pct Ti Alloy in Nitric Acid Medium for Reprocessing Applications

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Abstract

The Hf-40 wt pct Ti (Hf-Ti) alloy was developed for neutron poison application in the spent nuclear fuel reprocessing plant. The furnace-cooled Hf-Ti sample exhibited the microstructure comprising equiaxed-α, lamellar-α, and feathery-α. The water-quenched Hf-Ti sample confirmed the presence of lath and internally twinned martensite. In comparison to the furnace-cooled sample, low corrosion current density and passivation current density values obtained for the water-quenched Hf-Ti in 6 M HNO3 at 298 K (25 °C) indicated better passivation ability. The martensitic structure exhibited high hardness (660 HV) and negligible corrosion rate in 6 M nitric acid at 298 K (25 °C). X-ray photoelectron spectroscopic (XPS) analysis confirmed that passivation behavior of this alloy was due to the protective passive film composed of TiO2 and HfO2.

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Acknowledgments

The authors express their gratitude to Dr. A.K. Bhaduri, Director, Metallurgy and Materials Group, IGCAR, for constant encouragement and useful technical discussion. They acknowledge Mr. C. Thinaharan, Technical Officer-C of CSTG, for recording XPS spectra.

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Authors and Affiliations

  1. Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India

    J. Jayaraj (Scientific Officer), C. Mallika (Head) & U. Kamachi Mudali (Associate Director)

  2. PSG Institute of Advanced Studies, Peelamedu, Coimbatore, 641004, India

    K. R. Ravi (Assistant Professor)

Authors
  1. J. Jayaraj
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  2. K. R. Ravi
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  3. C. Mallika
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  4. U. Kamachi Mudali
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Corresponding author

Correspondence to U. Kamachi Mudali.

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Manuscript submitted December 22, 2015.

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Jayaraj, J., Ravi, K.R., Mallika, C. et al. Microstructure and Corrosion Behavior of Hf-40 Wt Pct Ti Alloy in Nitric Acid Medium for Reprocessing Applications. Metall Mater Trans A 47, 4393–4403 (2016). https://doi.org/10.1007/s11661-016-3602-8

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