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Physical-mechanism-based constitutive modeling of hot compression behavior of NbTiVZr0.5 medium-entropy alloy

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Abstract

High- and medium-entropy alloys are considered as new and promising material candidates for extreme service conditions. Due to the high strength and significant work-hardening under cold-forming conditions, the hot bulk-forming process is often used for raw billets of high-entropy alloys, which requires a thorough understanding of the hot flow behavior of new material and finite-element simulations of processing. In this paper, first, the hot compression tests of NbTiVZr0.5 medium-entropy alloy were carried out, and the flow stress–strain curves of NbTiVZr0.5 alloy at different temperatures 800–1000 °C and strain rates 0.001–0.1 /s were obtained, which enables the feasibility of hot bulk-forming such a new material to be evaluated. EBSD grain morphology and grain size under typical conditions were characterized to provide quantitative microscopic variables. Using the determined macro- and micro-values, a physical-mechanism-based constitutive model of NbTiVZr0.5 medium-entropy alloy was established considering the dynamic recrystallization and adiabatic heating effects, particularly in hot bulk-forming. The hot flow behavior under different deformation conditions was accurately predicted with good agreement with experimentation. The calculated R-value of 0.93 further demonstrates the accuracy of the predicted results.

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Acknowledgements

The authors would like to thank the financial support for this work provided by the Fundamental Research Funds for the Central Universities under the Grant Agreement DUT20RC(3)012.

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Authors and Affiliations

  1. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Yinggang Fang, Shuguang Qu, Jiayu Liang, Kailun Zheng & Shijian Yuan

  2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Peng Lin

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  1. Yinggang Fang
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  2. Shuguang Qu
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  3. Jiayu Liang
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  4. Peng Lin
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  5. Kailun Zheng
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Contributions

The study in this paper was performed as a collaboration between all the authors. YF, SQ, and KZ designed the program of the experiment and discussed the relevant details. KZ, PL, and SY designed the project and research theme and provided scientific guides. YF and JL performed the hot compression tests and microstructure observations. YF, SQ, JL, and KZ established suitable material constitutive model. YF, SQ, and KZ wrote the manuscript. All the authors analyzed the correction results. All the authors have read and agreed to the published version of the manuscript.

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Correspondence to Kailun Zheng.

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Fang, Y., Qu, S., Liang, J. et al. Physical-mechanism-based constitutive modeling of hot compression behavior of NbTiVZr0.5 medium-entropy alloy. Appl. Phys. A 129, 701 (2023). https://doi.org/10.1007/s00339-023-06960-z

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