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Development and Kinetics of TiB2 Layers on the Surface of Titanium Alloy by Superplastic Boronizing

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Abstract

The aim of this work is to explore the possibility of combining boronizing and superplastic deformation on titanium alloy (Ti6Al4V) substrate. Superplastic boronizing (SPB) is carried out at three different temperatures of 1173 K, 1223 K, and 1273 K (900 °C, 950 °C, and 1000 °C), and it is held for four different boronizing times of 1, 2, 3, and 6 hours. TiB2 is the only boride compound identified after the boronizing process. Boronized layer thickness in the range of 44.9 ± 1.1 to 149 ± 1 μm is formed on the surface of Ti6Al4V and the surface hardness values increase with respect of the formation’s degree of the hard boronized layer. Diffusion coefficient values attained for all temperatures are (1.44 ± 0.8) × 10−13, (4.1 ± 1.5) × 10−13, and (8.86 ± 4.1) × 10−13 m2 s−1, respectively and the values are higher as compared to other works referred. The activation energy obtained for this process is 226.17 ± 8.3 kJ mol−1. The results obtained suggest that the SPB process provides a more competent and efficient process for the formation of a boronized layer on the alloy.

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Acknowledgments

This research work is financed by the Postgraduate Research Fund, University of Malaya (Project No. PG113-2012B) and University of Malaya Research Grant (UMRG) (Project No. RP003B-13AET).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Nor Taibah Taazim (Student), Iswadi Jauhari (Senior Lecturer, Supervisor) & Mohd Faizul Mohd Sabri (Associate Professor)

  2. Department of Mechanical Engineering, Nagaoka University of Technology, 1503-1 Kamitomioka, Nagaoka, Niigata, 940-2188, Japan

    Yukio Miyashita (Associate Professor)

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  1. Nor Taibah Taazim
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  2. Iswadi Jauhari
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  3. Yukio Miyashita
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  4. Mohd Faizul Mohd Sabri
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Correspondence to Iswadi Jauhari.

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Manuscript submitted June 25, 2015.

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Taazim, N.T., Jauhari, I., Miyashita, Y. et al. Development and Kinetics of TiB2 Layers on the Surface of Titanium Alloy by Superplastic Boronizing. Metall Mater Trans A 47, 2217–2222 (2016). https://doi.org/10.1007/s11661-016-3359-0

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