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Ti6Al7Nb-based TiB-reinforced composites by selective laser melting

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  • Focus Issue: Multi-material Additive Manufacturing
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Abstract

The alloy Ti6Al7Nb with the in situ reinforcement of TiB has been processed by selective laser melting (SLM). Premixed Ti6Al7Nb-xTiB2 powders were used for the powder bed. The microstructure of the Ti6Al7Nb alloy was characterized by martensite (αʹ), while the addition of TiB2 led to a bimodal microstructure with refined features as a result of in situ formation of fine TiB phase. A prismatic < 11 0 > ││BD fiber texture was evident in all samples, though the texture formation was found to be affected by the change in the phase transformation pathway due to the formation of TiB. Higher hardness and yield strength (YS) in the composites as compared to the base material are attained. The examination of corrosion response revealed a lower corrosion current (Icorr) value for all the specimens in simulated body fluid (SBF) in comparison to Ti6Al4V alloy. The improved mechanical behavior and better corrosion resistance indicate the potential of SLM-processed Ti6Al7Nb/TiB composite as a suitable replacement for Ti6Al4V alloys for bio-implants.

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Acknowledgments

NS thanks the financial support from C. V. Raman Fellowship funded by the Indian Institute of Technology and the technical facility support provided from the Tallinn University of Technology, Tallinn, Estonia. Advanced facility for microscopy and microanalysis (AFMM) at IISc are acknowledged for the central TEM facility. Authors would also like to thank Dr. Prafull Pandey and Mr. Deepak Kumar from Department of Materials Engineering, IISc for their timely help in TEM analysis. Financial support from European Regional Development Fund through ASTRA6-6 is acknowledged.

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Authors and Affiliations

  1. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India

    N. Singh, S. Acharya, K. Chatterjee & S. Suwas

  2. Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate Tee 5, 19086, Tallinn, Estonia

    K. G. Prashanth

  3. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700, Leoben, Austria

    K. G. Prashanth

  4. CBCMT, School of Mechanical Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, 632 014, India

    K. G. Prashanth

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  1. N. Singh
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  5. S. Suwas
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Correspondence to S. Suwas.

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Singh, N., Acharya, S., Prashanth, K.G. et al. Ti6Al7Nb-based TiB-reinforced composites by selective laser melting. Journal of Materials Research 36, 3691–3700 (2021). https://doi.org/10.1557/s43578-021-00238-x

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  • DOI: https://doi.org/10.1557/s43578-021-00238-x

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