朱晨辉, 徐流杰, 刘美君, 郭明宜. 间隙原子掺杂高熵合金的研究进展[J]. 工程科学学报, 2023, 45(9): 1459-1469. DOI: 10.13374/j.issn2095-9389.2022.10.24.006
引用本文: 朱晨辉, 徐流杰, 刘美君, 郭明宜. 间隙原子掺杂高熵合金的研究进展[J]. 工程科学学报, 2023, 45(9): 1459-1469. DOI: 10.13374/j.issn2095-9389.2022.10.24.006
ZHU Chenhui, XU Liujie, LIU Meijun, GUO Mingyi. Research progress on interstitial-atom-doped high-entropy alloys[J]. Chinese Journal of Engineering, 2023, 45(9): 1459-1469. DOI: 10.13374/j.issn2095-9389.2022.10.24.006
Citation: ZHU Chenhui, XU Liujie, LIU Meijun, GUO Mingyi. Research progress on interstitial-atom-doped high-entropy alloys[J]. Chinese Journal of Engineering, 2023, 45(9): 1459-1469. DOI: 10.13374/j.issn2095-9389.2022.10.24.006

间隙原子掺杂高熵合金的研究进展

Research progress on interstitial-atom-doped high-entropy alloys

  • 摘要: 分析了间隙原子C、N、O、B对高熵合金组织和性能的影响;总结了四种间隙原子含量及其产生的固溶强化、晶粒细化、第二相强化作用对高熵合金组织及性能等方面影响,大量的研究表明,在高熵合金体系中掺杂间隙原子不仅可以调控相结构组成(促进/抑制相变,析出第二相颗粒),还可以改变其形变机制(TWIP、TRIP效应)以实现材料的强韧化。其有效利用既可以拓宽高熵合金的设计思路,也可以有效降低航空材料的制备成本。最后提出了含间隙原子的高强高韧高熵合金组织结构设计研究的新方向:(1)了解不同类型高熵合金的掺杂机理,建立更适合高熵合金体系的固溶强化模型;(2)找出合适的间隙原子及其掺杂量来调节高熵合金微观结构和力学性能。研究设计掺杂不同间隙原子的高熵合金有望揭示不同间隙原子对其相结构、形变机制和力学性能的影响,具有重要的科学及工程实践意义。

     

    Abstract: High-entropy alloy has become a research hotspot because of its unique microstructure and mechanical properties. The appearance of high-entropy alloy breaks the design concept of traditional alloy with one or two elements as the main element and other elements as the auxiliary element, providing a broader space for the development of new materials. Conventional alloys are generally optimized by four different strengthening methods, as are high-entropy alloys consisting of five or more elements. Appropriately doped interstitial atoms with small atomic sizes (such as C, B, O, and N) can dissolve into crystal interstice, combine with alloying elements to form a fine microstructure and dispersion-strengthened phase, and improve the properties of high-entropy alloy by reducing the layer fault energy and changing the dislocation motion mode. Therefore, exploring the effect of interstitial atom doping on the properties of high-entropy alloys is conducive to promoting the application of high-entropy alloys in different material fields. The effects of the interstitial atoms C, N, O, and B on the microstructures and properties of high-entropy alloys are analyzed. The contents of four kinds of interstitial atoms and their effects on the microstructures and properties of high-entropy alloys are summarized. Numerous studies have shown that doping interstitial atoms can not only regulate the structural composition of the phase (i.e., promote/inhibit the phase transformation and precipitate the second phase particles) in high-entropy alloy systems. The deformation mechanism, i.e., TWIP (Twinning induced plasticity) and TRIP(Transformation induced plasticity) effects, can also be changed to strengthen and toughen the material. Its effective utilization can not only broaden the design idea of high-entropy alloy but also effectively reduce the preparation cost of aviation materials. Finally, a new direction in microstructure design of high-strength, high-toughness, and high-entropy alloys containing interstitial atoms is proposed to (1) understand the doping mechanism of different types of high-entropy alloys and establish a solution-strengthening model more suitable for high-entropy alloy systems and (2) determine the appropriate interstitial atoms and doping amount to adjust the microstructures and mechanical properties of high-entropy alloys. The study and design of high-entropy alloys doped with different interstitial atoms are expected to reveal the effects of different interstitial atoms on the phase structure, deformation mechanism, and mechanical properties, which have important scientific and engineering practical significance.

     

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