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Effect of Aging Treatment on the Formation of α Precipitates in β-Type Ti–6Mo–6V–5Cr–3Sn–2.5Zr Alloys

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Abstract

The microstructural evolution of a novel β-type Ti–6Mo–6V–5Cr–3Sn–2.5Zr (wt%) alloy subjected to different aging treatments was investigated. The normalized intensity of the α precipitates reached a peak value at 450 °C. A nanoscale orthorhombic phase was observed to coexist with α precipitates in the β matrix, which followed the Burgers orientation relation of 〈\(1120\)〉α//〈111〉β and {0001}α//{110}β. Fine α precipitates were formed with metastable O and β′ phases, and the β phase was spinodally decomposed to β and β′ phases. The maximum hardness value of the specimen was obtained after aging at 450 °C. Compositional partitioning of Mo, V, and Cr elements occurred with the depletion of fine acicular α precipitates upon aging 450 °C.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. 2015R1D1A1A01056861).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Chonnam National University, Gwangju, 500-757, Republic of Korea

    Gwanghyo Choi & Kwangmin Lee

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  1. Gwanghyo Choi
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  2. Kwangmin Lee
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Correspondence to Kwangmin Lee.

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Choi, G., Lee, K. Effect of Aging Treatment on the Formation of α Precipitates in β-Type Ti–6Mo–6V–5Cr–3Sn–2.5Zr Alloys. Met. Mater. Int. 24, 441–447 (2018). https://doi.org/10.1007/s12540-018-0028-4

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  • DOI: https://doi.org/10.1007/s12540-018-0028-4

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