高熵合金/金刚石超硬复合材料微结构设计与韧化机理研究

金刚石超硬材料在切削和钻探工具方面具有关键作用。我国是金刚石原材料大国，但在高性能超硬制品方面亟待发展。本项目针对金刚石超硬材料界面调控和强韧化机制等关键科学问题，以高熵合金为新型粘结相，通过金刚石表面涂层调控界面组织，系统揭示超硬材料服役过程的力学行为。项目拟研究合金化和界面结构对超硬材料显微组织演化的影响规律，定量描述其热、动力学行为；研究不同层次微观结构对材料强度和断裂韧性的作用规律，揭示成分、界面和缺陷状态的影响机制；研究材料疲劳、冲击服役行为与力学性能的关系，建立系统、科学的综合性能评价体系。项目的完成可望大大完善超硬材料设计与强韧化基础理论，提升超硬材料行业技术水平，解决我国高端制造、基础建设对超硬材料的重大需求，促进湖南地方科技、经济的快速发展。

Diamond-based superhard materials are of great importance for cutting and drilling tools. China is the largest diamond-producing country, but still needs to fasten the R&D of high-end products. The project aims to dissolve key scientific problems of interfacial control and strengthening-toughening mechanisms of diamond-based superhard materials, makes use of high entropy alloys as binder phase, coats diamonds with multi-level protecting layers, and discovers the mechanical behavior during service. The project will investigate the effects of alloying and interface structure on microstructural evolutions, and quantitatively describe the thermodynamic and kinetic behavior; will study the effects of different levels of structures on strength and fracture toughness, and discover the effecting mechanisms of compositions, interface structure and bonding; will study the fatigue, impact behavior and their relation to conventional mechanical properties, and build up a systematic and scientific evaluation system for synthetic properties. The project will bring new in-sight to the design and toughening of superhard materials, improve the technology of the industry, meet the demands of high-level manufacturing and infrastructural construction of China, and accelerate the progress of technology and economy of Hunan province.