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Microstructure Modification and Ductility Improvement for TaMoNbZrTiAl Refractory High Entropy Alloys via Increasing Ti Content

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Here, the composition of TaMoNbZrTiAl refractory high entropy alloy (RHEA) is optimized by increasing Ti content to improve its mechanical property especially the ductility, through comparing two RHEAs with different Ti content. The RHEAs contain two body-centered-cubic (BCC) phases. The BCC phase in the dendritic region is rich in Ta, Mo and Nb, and the BCC phase in the interdendritic region is enriched in Zr, Ti and Al. The as-cast RHEA with a higher Ti content remains dendritic microstructures, and Ti is mainly enriched in the interdendritic region. After annealing treatment at 1300 °C for 48 h, the dendritic microstructures change into equiaxed-grain morphology, accompanied by needle-like micron precipitates at grain boundaries in the RHEA with higher Ti content. For the as-cast RHEAs, the fracture strain increases by ~ 6.6% and the uniform plastic strain increases by ~ 5.9% at the compression test due to the increase of Ti content. Our work offers a reference for the composition design of RHEAs and makes a preliminary exploration of the optimization of the microstructures and mechanical properties.

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Acknowledgements

Y. Guo thanks Prof. Hu Zhang and Prof. Lina Jia at Beihang University for the preparation of experimental alloys. Thermo-Calc simulations and experiments, including SEM, EPMA, STEM, mechanical testing, etc., were performed at Max-Planck-Institut für Eisenforschung, and the authors acknowledge M. Nellessen, U. Tezins and A. Sturm for the experimental support.

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Authors and Affiliations

  1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Yujing Zhou, Siyi Peng, Yueling Guo & Changmeng Liu

  2. Shagang School of Iron and Steel, Soochow University, Suzhou, 215137, China

    Xiaoxiang Wu

  3. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Zhiming Li

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  1. Yujing Zhou
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  2. Siyi Peng
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Contributions

Yujing Zhou was involved in methodology, formal analysis, investigation and writing—original draft. Siyi Peng contributed to methodology, formal analysis and investigation. Yueling Guo participated in conceptualization, investigation, methodology, formal analysis and writing—review and editing. Xiaoxiang Wu took part in methodology and writing—review and editing. Changmeng Liu was responsible for investigation, methodology and formal analysis. Zhiming Li was involved in methodology, formal analysis and writing—review and editing.

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Correspondence to Yueling Guo.

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Zhou, Y., Peng, S., Guo, Y. et al. Microstructure Modification and Ductility Improvement for TaMoNbZrTiAl Refractory High Entropy Alloys via Increasing Ti Content. Acta Metall. Sin. (Engl. Lett.) (2024). https://doi.org/10.1007/s40195-024-01707-y

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