原位自生纳米氧化物对高熵合金强韧化机理研究

The special structure of high-entropy alloys determines its unique and extraordinary properties. However, higher requirements on its performance were necessary with the wider prospect in industrial applications. Based on this, plasma spraying technology will be carried out to fabricate in-situ autogenous multi-nano-oxide enhanced high-entropy alloy composites. The synthesis and growth mechanisms of nano-oxide reinforcement will be investigated. Moreover, the controllable growth and distribution of reinforcement can be realized, and the phase transition rule, interfacial stability and interfacial binding mechanism of nano-oxide will be clarified. Combined with in-situ tensile tests in transmission electron microscope, the effects of multiple nano-oxides on microstructure, deformation mechanism and mechanical properties of high-entropy alloy composites will be revealed. The mapping relationships between plasma spraying processing, microstructure and mechanical properties of high-entropy alloy will be established. This research will provide new ideas for the rapid and low-cost preparation of high-entropy alloy composites with excellent properties, and can effectively promote the application of high-entropy alloy in critical components of national defense, aerospace and other fields.

高熵合金所具有特殊的结构决定了其奇特超凡的性能，但是随着工业化应用的逐步扩展对其性能提出了更高的要求。为此，我们提出采用等离子喷涂技术，实现原位自生多元纳米氧化物增强高熵合金复合材料的制备。通过对纳米氧化物增强相合成机理和生长机制的研究，实现增强相的可控生长及分布，从而阐明复合材料纳米增强相相变规律、界面稳定性及界面结合机理；结合透射电镜原位拉伸实验，揭示多元纳米氧化物对高熵合金复合材料的微结构、变形机制及力学性能的影响规律，从而建立高熵合金等离子喷涂工艺-组织结构-力学性能的映射关系。研究成果为快速、低成本制备性能优异的高熵合金复合材料提供新的思路，有效推动高熵合金在国防和航空航天等领域关键构件的应用。