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Simultaneously enhanced oxidation resistance and mechanical properties in a novel lightweight Ti2VZrNb0.5Al0.5 high-entropy alloy

协同提高新型轻质Ti2VZrNb0.5Al0.5高熵合金抗氧化性能与力学性能

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Abstract

Enhanced oxidation resistance is a primary demand for the application of refractory high-entropy alloys (RHEAs) at elevated temperatures. In this study, Al was added to a Ti2VZrNb RHEA to partially substitute Nb to improve its oxidation resistance and mechanical properties. The alloy was found to have an increased oxidation resistance by forming a continuous Al2O3 + ZrO2 oxide protective surface. At the same time, the room-temperature yield strength was also increased by 66% to 1273 MPa via solid solution strengthening. The low atomic mass of Al also helped to reduce the density of the alloy by 8.2% to 5.44 g cm−3. This resulted in a high specific yield strength of 234 MPa cm3 g−1 for the alloy. Meanwhile, the Ti2VZrNb0.5Al0.5 alloy also exhibited a high compressive plasticity of >50%. These values are among the best reported so far for RHEAs.

摘要

提高抗氧化性能是难熔高熵合金高温应用的首要要求. 本研究中, 我们将Al代替50%Nb添加到Ti2VZrNb难熔高熵合金中, 以提高其抗氧化性能与力学性能. 结果表明, 相比于Ti2VZrNb合金, Ti2VZrNb0.5-Al0.5 合金的抗氧化性得到了显著提升, 这是由于在合金表面形成了连续的Al2O3 + ZrO2氧化层保护膜. 同时, Ti2VZrNb0.5Al0.5 合金室温屈服强度高达1273 MPa, 相比于Ti2VZrNb合金强度提升66%. 结构表征说明, Ti2VZrNb0.5Al0.5合金强度提升得益于其较大的固溶强化效果. 较轻元素Al的添加使得该合金具有较低的密度(5.44 g cm−3), 相比于Ti2VZrNb 合金密度降低8.2%, 这使得该合金的比强度高达234 MPa cm3g−1. 同时, Ti2VZrNb0.5Al0.5合金也具有较高的压缩塑性(>50%). 综合这些结果, 该合金是迄今为止所报道的性能最好的难熔高熵合金.

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Acknowledgements

This research was supported by the National Key R&D Program of China (2021YFA1200201), the National Natural Science Foundation of China (52071003, 91860202, and 11604006), Beijing Nova Program (Z211100002121170), Beijing Municipal Education Commission Project (PXM2020_012040_002021 and PXM2019_012045_003232), Beijing Outstanding Young Scientists Projects (BJJWZYJH01201910005018), Beijing Natural Science Foundation (Z180014), and “111” project (DB18015).

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Authors and Affiliations

  1. Beijing Key Lab of Microstructure and Property of Advanced Materials, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China

    Zibing An  (安子冰), Shengcheng Mao  (毛圣成), Yanhui Chen  (陈艳辉), Xiaomeng Yang  (杨晓萌), Shanshan Liu  (刘珊珊), Xin Wang  (汪鑫), Qingsong Deng  (邓青松), Ze Zhang  (张泽) & Xiaodong Han  (韩晓东)

  2. Department of Materials Science and Engineering, College of Science and Engineering, City University of Hong Kong, Hong Kong, China

    Tao Yang  (杨涛)

  3. Department of Mechanical Engineering, The University of Western Australia, Perth, WA, 6009, Australia

    Yinong Liu  (刘亦农)

  4. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310058, China

    Ze Zhang  (张泽)

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  1. Zibing An  (安子冰)
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  2. Shengcheng Mao  (毛圣成)
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  5. Yanhui Chen  (陈艳辉)
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  8. Xin Wang  (汪鑫)
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  10. Ze Zhang  (张泽)
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  11. Xiaodong Han  (韩晓东)
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Contributions

Han X, Mao S, and An Z designed the study. An Z, Yang T, Yang X, Wang X, and Liu S carried out the main experiments. An Z, Han X, Mao S, Zhang Z, Liu Y, and Chen Y analyzed the data and wrote the main draft of the paper. All authors contributed to the discussion of the results and commented on the manuscript.

Corresponding authors

Correspondence to Shengcheng Mao  (毛圣成), Yinong Liu  (刘亦农) or Xiaodong Han  (韩晓东).

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Conflict of interest

The authors declare that they have no conflict of interest.

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Supporting data are available in the online version of the paper.

Zibing An is a PhD candidate at Beijing Key Laboratory and the Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology. His current research focuses on the design and deformation mechanism of high-performance high-entropy alloy materials.

Shengcheng Mao is a professor at Beijing University of Technology. His current interests focus on the development of novel in-situ techniques in TEM and their applications in high-entropy alloys and superalloys, to in-situ study the evolution of microstructure under external mechanical, electric and thermal fields, and to reveal the underlying mechanisms.

Yinong Liu is a professor at The University of Western. His current research interests are in the broad field of materials science and engineering, with specific attention in physical metallurgy, metallic composites, shape memory alloys, magnetic materials, thin films for MEMS technology, elastic strain engineering, nanomaterials, and functional materials.

Xiaodong Han is a professor at Beijing University of Technology. He originally developed the atomic-level in-situ dynamic characterization method of the mechanical behavior of materials, and increased the spatial resolution of the in-situ characterization technology of the mechanical behavior of materials from nanometer to picometer scales, achieving an order of magnitude improvement. His research mainly focuses on the physical and chemical properties of materials, the mechanical behavior of materials from micro-nano to atomic resolution in a wide temperature range (room temperature to 1200°C) and environmental conditions.

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Simultaneously enhanced oxidation resistance and mechanical properties in a novel lightweight Ti2VZrNb0.5Al0.5 high-entropy alloy

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An, Z., Mao, S., Yang, T. et al. Simultaneously enhanced oxidation resistance and mechanical properties in a novel lightweight Ti2VZrNb0.5Al0.5 high-entropy alloy. Sci. China Mater. 65, 2842–2849 (2022). https://doi.org/10.1007/s40843-022-2045-4

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