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Advanced Mechanical Properties of a Powder Metallurgy Ti-Al-N Alloy Doped with Ultrahigh Nitrogen Concentration

  • Powder Metallurgy of Non-Ferrous Metals
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Abstract

Titanium and its alloys are recognized for their attractive properties. However, high-performance Ti alloys are often alloyed with rare or noble-metal elements. In the present study, Ti alloys doped with only ubiquitous elements were produced via powder metallurgy. The experimental results showed that pure Ti with 1.5 wt.% AlN incorporated exhibited excellent tensile properties, superior to similarly extruded Ti-6Al-4V. Further analysis revealed that its remarkably advanced strength could primarily be attributed to nitrogen solid-solution strengthening, accounting for nearly 80% of the strength increase of the material. In addition, despite the ultrahigh nitrogen concentration up to 0.809 wt.%, the Ti-1.5AlN sample showed elongation to failure of ~ 10%. This result exceeds the well-known limitation for nitrogen (over 0.45 wt.%) that causes embrittlement of Ti alloys.

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Acknowledgements

This work was partially supported by the Japan Science and Technology Agency (JST) under Industry–Academia Collaborative R&D Program “Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials.”

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Authors and Affiliations

  1. Joining and Welding Research Institute, Osaka University, Osaka, Japan

    J. Shen, B. Chen, J. Umeda & K. Kondoh

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  1. J. Shen
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  2. B. Chen
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  3. J. Umeda
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  4. K. Kondoh
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Correspondence to J. Shen.

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Shen, J., Chen, B., Umeda, J. et al. Advanced Mechanical Properties of a Powder Metallurgy Ti-Al-N Alloy Doped with Ultrahigh Nitrogen Concentration. JOM 70, 626–631 (2018). https://doi.org/10.1007/s11837-018-2780-9

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  • DOI: https://doi.org/10.1007/s11837-018-2780-9

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