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Microstructural Evolution and Mechanical Properties of Ti-22Al-25Nb Alloy Fabricated by High-Pressure Torsion under Ageing Treatment

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Abstract

In this study, the samples after high-pressure torsion (HPT) were heated with temperatures ranging from 800 to 950 °C for 1, 2, 6 and 12 h to optimize the microstructure of deformed Ti-22Al-25Nb alloy and enhance its mechanical properties. The results revealed that B2 and O phases developed into α2 phase above 900 °C. Particle spheroidization occurred during the ageing process. However, the lamellar B2 and O phases still existed when the ageing temperature reached 950 °C, indicating that the spheroidization process was incomplete. Most α2 phases were distributed at the interface of O and B2 phases. The orientation relationships (OR) among α2, O and B2 phases were [0001]α2 // [001]B2 and [0001]α2 // [001]O. It indicated the phase transformation of O + B2 → α2. Moreover, the micro-hardness of Ti-22Al-25Nb alloy with a maximum value of ~ 475 HV decreased constantly with increase in ageing temperature. The micro-hardness first decreased to the minimum value of ~ 315 HV and then increased with increase in ageing treatment time. The micro-hardness depended on the content of the phase composition and particle size. The relation of micro-hardness to microstructure was analyzed using multiple regression analysis schedules. It should be noted that the calculated values agreed with the experimental results. This means that the micro-hardness of Ti-22Al-25Nb alloy meaningfully depends on the phase volume fraction and particle size in this work.

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Acknowledgments

This project is supported by the National Natural Science Foundation of China (No. 51905123), Natural Scientific Research Innovation Foundation in Harbin Institute of Technology (HIT.NSRIF.2020091), Major Science and Technology Innovation Project of Shandong Province (2020CXGC010303) and Key project of Natural Science Foundation of China (U1937205).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Huan Li, Wencong Zhang, Jianlei Yang, Jinqi Pan, Wenzhen Chen, Guorong Cui, Guofeng Wang & Guannan Chu

  2. Weihai Lightweight Materials and Forming Engineering Research Center, Weihai, 264209, People’s Republic of China

    Wencong Zhang, Jianlei Yang, Wenzhen Chen & Guorong Cui

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  1. Huan Li
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  2. Wencong Zhang
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Contributions

HL was involved in conceptualization, writing—original draft, formal analysis, carried out the experiment, planned the experiments. WZ helped in conceptualization, writing—original draft, formal analysis, planned the experiments. JY contributed to supervision, formal analysis, planned the experiments. JP carried out the experiment. WC, GC and GW were involved in supervision.

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Correspondence to Jianlei Yang.

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Li, H., Zhang, W., Yang, J. et al. Microstructural Evolution and Mechanical Properties of Ti-22Al-25Nb Alloy Fabricated by High-Pressure Torsion under Ageing Treatment. J. of Materi Eng and Perform 32, 4902–4910 (2023). https://doi.org/10.1007/s11665-022-07465-1

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  • DOI: https://doi.org/10.1007/s11665-022-07465-1

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