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Cooling Rate Effect on Microstructures and Mechanical Properties of Ti-7Al-1Mo-0.5V-0.1C

  • Phase Stability in Extreme Environments
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Abstract

The Ti-7Al-1Mo-0.5V-0.1C alloy exhibits low density and good mechanical properties, and has potential applications in aerospace industries. The microstructure features of titanium alloys, such as the morphology and volume fraction of the primary α phase (αp) and the precipitation of the secondary α phase (αs), are sensitive to heat treatment parameters, especially the cooling rate from the two-phase region. In this work, we have characterized the precipitation of the secondary α phase and ordered α2 phase in Ti-7Al-1Mo-0.5V-0.1C alloy under water quenching, air cooling, and furnace cooling, and have investigated their effects on the mechanical properties of the Ti-7Al-1Mo-0.5V-0.1C alloy. The results show that the secondary α phase is significantly coarsened in the air-cooled alloy and leads to an increase in the strength but decrease in the ductility of the alloy, while the equiaxed microstructure generated in the furnace-cooled alloy, with no precipitation of the secondary α phase and an increase in size of the ordered α2 precipitation phase within the primary α phase, contributes to a further increase in ductility.

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Acknowledgements

The authors are grateful to the financial support from the Natural Science Foundation of China (Grant Nos. 51901102 and 52101005).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Jiayao Ying, Qunbo Fan, Shun Xu, Lin Yang & Xingwang Cheng

  2. National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing, 100081, China

    Jiayao Ying, Qunbo Fan, Shun Xu, Lin Yang & Xingwang Cheng

  3. Beijing Institute of Technology Chongqing Innovation Center, Chongqing, 401135, China

    Qunbo Fan

  4. Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA

    Jian Wang

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  1. Jiayao Ying
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Correspondence to Qunbo Fan or Shun Xu.

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Ying, J., Fan, Q., Xu, S. et al. Cooling Rate Effect on Microstructures and Mechanical Properties of Ti-7Al-1Mo-0.5V-0.1C. JOM 75, 4644–4652 (2023). https://doi.org/10.1007/s11837-023-05949-6

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  • DOI: https://doi.org/10.1007/s11837-023-05949-6

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