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Structure and Properties of Nano-Scale Oxide-Dispersed Iron

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Abstract

Bulk samples of pure iron and yttria dispersed iron with and without titanium (i.e., Fe, Fe-Y2O3, and Fe-Y2O3-Ti) were prepared by hot extrusion of high-energy ball-milled powders. An examination of the microstructure using TEM revealed that the addition of titanium resulted in the reduction of the dispersoid size with a concomitant increase in the volume fraction of the dispersoids. As a result, Fe-Y2O3-Ti exhibited a substantial increase in hardness and tensile properties as compared to Fe and Fe-Y2O3. The higher hardness and strength of Fe-Y2O3-Ti is shown to be due to the presence of finer and higher number density of Y-Ti-O complex oxides. Dynamic strain aging in the temperature range of 423 K to 573 K (150 °C to 300 °C) was observed in all the compositions studied.

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Acknowledgments

The authors thank Mr. G.V.R. Reddy for carrying out SEM examination. They are grateful to Dr. S.V. Kamat, Defence Metallurgical Research Laboratory, Hyderabad, for helpful suggestions during the course of the work.

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Authors and Affiliations

  1. International Advanced Research Centre for Powder Metallurgy & New Materials (ARCI), Balapur, Hyderabad, 500 005, India

    R. Vijay (Scientist E), M. Nagini (SAF), S. S. Sarma (Scientist C), M. Ramakrishna (Scientist C), A. V. Reddy (Consultant) & G. Sundararajan (Director)

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  1. R. Vijay
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  2. M. Nagini
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  3. S. S. Sarma
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  4. M. Ramakrishna
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Correspondence to G. Sundararajan.

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Manuscript submitted June 3, 2013.

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Vijay, R., Nagini, M., Sarma, S.S. et al. Structure and Properties of Nano-Scale Oxide-Dispersed Iron. Metall Mater Trans A 45, 777–784 (2014). https://doi.org/10.1007/s11661-013-2019-x

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  • DOI: https://doi.org/10.1007/s11661-013-2019-x

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