Graphical Abstract
Due to their excellent properties of specific strength, fracture resistance, corrosion and oxidation resistance, the high entropy alloys have attracted widespread attention as engineering materials. For the sake of industrial applications, one of the essential stages would be the forming of them, especially the construction of multi-scale structures from macroscale to nanoscale. In this work, an efficient method to achieve the fabrication of multi-scale structures on the high entropy alloys is proposed, namely ultrasonic-vibration-assisted plastic forming. In this way, the required pressure can be effectively reduced from 1.53 GPa to 6.87 MPa. And the whole process takes place in milliseconds. Meanwhile, transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) were used to explore the plastic deformation mechanisms of a synergy between dislocation and twinning. The current findings open a window not only to propose new methods for forming multi-scale structures of high entropy alloys but also to reveal the plastic deformation mechanism.
摘要
高熵合金以其优异的比强度、抗断裂、耐腐蚀、抗氧化等性能受到了广泛的关注。这类材料的加工成型, 特别是从宏观到纳米的多尺度结构的快速构建, 是实现其工业化应用的关键. 本文提出了一种在高熵合金上实现多尺度结构制备的有效方法, 即超声振动辅助的室温快速成型加工. 在超声振动这种特殊的应力条件下, CoCrFeNiMn高熵合金的成型应力有效地从1.53 GPa降低到了6.87 MPa, 且整个过程发生在几百毫秒内. 利用透射电镜(TEM)和电子背散射衍射(EBSD)研究了位错与孪生协同的塑性变形机制. 目前的研究结果不仅为高熵合金多尺度结构的加工成型提供了新方法, 而且揭示了其在高频振动作用下塑性变形的机制.
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Acknowledgements
The work was financially supported by the National Key Research and Development Program of China (Nos. 2018YFA0703605), the Key Basic and Applied Research Program of Guangdong Province, China (No. 2019B030302010), the National Natural Science Foundation of China (Nos. 52122105, 51971150 and 51871157). The authors thank the assistance on microscope observation received from the Electron Microscope Center of Shenzhen University.
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Wen, WX., Li, LY., Li, Z. et al. Ultrasonic vibration-assisted multi-scale plastic forming of high-entropy alloys in milliseconds. Rare Met. 42, 1146–1153 (2023). https://doi.org/10.1007/s12598-022-02171-2
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DOI: https://doi.org/10.1007/s12598-022-02171-2