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Novel as-cast Ti-rich refractory complex concentrated alloys with superior tensile properties

具有优异拉伸性能的新型铸态富Ti难熔高熵合金

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Abstract

Refractory complex concentrated alloys (RCCAs) have drawn particular attention for their high yield strength and superior softening resistance at high temperatures. However, poor room-temperature ductility and high density remain the main challenges for their processing and applications. Here, using inherent material characteristics as the alloy-design principles, three novel single-phase body-centered cubic structured Ti3Zr1.5Nb(1−x)MoxVAl0.25 (x = 0.1, 0.3, 0.5, marked as Mo0.1, Mo0.3, and Mo0.5, respectively) RCCAs with promising tensile ductility and relatively low density below 6 g cm−3 were developed by tailoring the Mo concentration. The introduction of Mo elements with high shear modulus promotes lattice distortion, contributing to enhanced lattice friction stress and yield strength. The Mo0.3 and Mo0.5 alloys exhibit tensile yield strengths exceeding 1100 MPa and high fracture elongation of over 15% in the as-cast state. Labusch’s model revealed that solid-solution strengthening induced by atomic size and shear modulus mismatch contributes most significantly to yield strength. Deformation microstructure observations uncovered that the formation of the kink bands, dense-dislocation walls, and Taylor lattices are highly effective in enhancing strain-hardening capacity due to their high density of dislocation boundaries, enabling the alloys to maintain high strength while yet ensuring enough ductility. This study provides new insights into the development of strong and ductile RCCAs with single-phase structures.

摘要

难熔高熵合金因其优异的高温屈服强度和抗软化性能而备受关 注. 然而, 室温延展性差和较高的密度目前仍然是其加工以及应用需要 面临的主要挑战. 本文利用材料的固有特性作为合金设计原则, 通过调 控Mo浓度, 制备了三种新型单相体心立方结构的Ti3Zr1.5Nb(1−x)−MoxVAl0.25 (x = 0.1, 0.3, 0.5, 标记为Mo0.1, Mo0.3和Mo0.5)合金, 这些 合金都具有良好的拉伸延展性和低于6 g cm−3的密度. 高剪切模量Mo 元素的引入促进了晶格畸变, 从而提高了合金中的晶格摩擦应力以及 屈服强度. 铸态Mo0.3和Mo0.5合金均表现出超过1100 MPa的拉伸屈服 强度, 以及大于15%的断裂延伸率. Labusch模型计算结果表明, 原子尺 寸和剪切模量失配引起的固溶强化对屈服强度的影响最为显著. 通过 观察变形微观组织发现, 由于存在高密度的位错界面, 扭折带、位错壁 以及泰勒晶格的形成能有效提高合金的应变硬化能力, 使合金在展现 高强度的同时保持足够的延展性. 该研究为开发具有高强韧的单相难 熔高熵合金提供了新的见解.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (52074257) and Chinese Academy of Sciences (ZDBS-LY- JSC023).

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Authors and Affiliations

  1. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Shuai Zeng  (曾帅), Yongkang Zhou  (周永康), Huan Li  (李欢), Jingqian Chen  (陈景乾), Hongwei Zhang  (张宏伟), Huameng Fu  (付华萌), Aiming Wang  (王爱民), Haifeng Zhang  (张海峰) & Zhengwang Zhu  (朱正旺)

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Shuai Zeng  (曾帅), Yongkang Zhou  (周永康) & Jingqian Chen  (陈景乾)

  3. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Shuai Zeng  (曾帅), Yongkang Zhou  (周永康), Huan Li  (李欢), Jingqian Chen  (陈景乾), Hongwei Zhang  (张宏伟), Huameng Fu  (付华萌), Aiming Wang  (王爱民), Haifeng Zhang  (张海峰) & Zhengwang Zhu  (朱正旺)

  4. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Haifeng Zhang  (张海峰) & Zhengwang Zhu  (朱正旺)

  5. Unit 96901 PLA, Beijing, 100094, China

    Hongquan Gao  (高洪泉) & Hongwei Zhao  (赵宏伟)

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  1. Shuai Zeng  (曾帅)
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  2. Yongkang Zhou  (周永康)
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  3. Hongquan Gao  (高洪泉)
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  4. Huan Li  (李欢)
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  9. Haifeng Zhang  (张海峰)
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  11. Zhengwang Zhu  (朱正旺)
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Contributions

Author contributions Zhu ZW conceived the research. Zeng S, Zhou YK, Li H, and Chen JQ designed the experiments. Zeng S performed the experiments with assistance from Zhou YK, Li H, and Chen JQ. Zeng S, Zhu ZW, Gao HQ, Zhang HW, Fu HM, and Wang AM analyzed the date. Zeng S and Zhu ZW wrote the paper with input from Zhang HF and Zhao HW. All anthors discussed the results and commented on the manuscript.

Corresponding author

Correspondence to Zhengwang Zhu  (朱正旺).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Shuai Zeng is a PhD candidate at Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences. His current research focuses on the design and deformation mechanism of high-performance lightweight refractory high-entropy alloy materials.

Zhengwang Zhu received his PhD degree from the Institute of Metal Research, Chinese Academy of Sciences. From 2009 to 2010, he conducted research at Tohoku University (Japan). He joined the Institute of Metal Research, Chinese Academy of Sciences as an assistant professor in 2010, was promoted to professor in 2016, and now moved to Northeastern University. His research focuses on the development and application of high-performance alloys, in particular, metallic glasses and high-entropy alloys.

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Zeng, S., Zhou, Y., Gao, H. et al. Novel as-cast Ti-rich refractory complex concentrated alloys with superior tensile properties. Sci. China Mater. 67, 311–320 (2024). https://doi.org/10.1007/s40843-023-2705-2

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