高性能毫米级金属层状复合板在航空航天、轨道交通和国防军工等领域具有较高的经济价值和广泛的应用前景。随着装备极限服役条件的不断提高，对材料及其制备加工技术提出了高性能、低能耗、低成本等迫切需求。金属层状复合板制备过程中实现层内、界面强塑性变形和界面强冶金结合是提高金属层状复合板综合性能、延长服役寿命、实现高效利用的重要方法。轧制复合技术制备金属层状复合板具有高效率、低能耗、低成本等优势。然而，现有轧制复合技术制备镁/铝等变形协调性差和铜/钢等固溶度低的金属层状复合板时，存在界面难复合或结合强度低等问题。在金属强塑性变形过程中施加超声波作用，可以降低金属材料的屈服和流动应力及元素扩散的能量壁垒，促进异种金属的协调变形和界面冶金结合，提高金属材料的成形性能，但是受限于超声波能量传播的耗散影响，超声波辅助轧制复合成形目前只应用于箔材，尚无法应用于具有更广泛用途的毫米级金属层状复合板。基于此，本项目提出开发多超声波叠加系统辅助毫米级金属层状复合板成形技术，将重点突破多超声波叠加系统辅助金属材料强塑性变形关键技术，解决多超声波叠加系统辅助作用下金属材料塑性变形行为及性能提升机理和多超声波叠加系统辅助作用下毫米级金属层状复合板轧制协调变形及界面结合机理2个关键科学问题。围绕上述关键科学问题和关键技术问题，本项目拟构建多超声波叠加系统模式，明晰超声波传播机理，阐明多超声波叠加系统辅助金属材料塑性成形过程中金属流动规律及内部缺陷的增殖、迁移及湮灭行为，揭示多超声波叠加作用对金属层状复合板协同变形行为及界面结合影响规律，开发多超声波叠加系统辅助轧制成形毫米级金属层状复合板技术及成形设备，实现镁/铝、铜/钢等高性能毫米级金属层状复合板的高效制备，为满足航空航天、轨道交通和国防军工等领域对高性能毫米级金属层状复合板的迫切需求提供技术支撑和理论基础。

High-performance millimeter-scale metal laminated composite plates have high economic value and wide application prospects in aerospace, rail transportation and defense industry. With the continuous improvement of equipment limit service conditions, the material and its preparation and processing technology puts forward high performance, low energy consumption, low cost and other urgent needs. Metal laminated composite plate preparation process to realize the layer, interface strong plastic deformation and interface strong metallurgical bonding is to improve the comprehensive performance of metal laminated composite plate, extend the service life, realize the important method of efficient use. Rolling composite technology to prepare metal laminated composite plate has high efficiency, low energy consumption, low cost and other advantages. However, the existing rolling composite technology to prepare magnesium / aluminum and other deformation coordination is poor and copper / steel and other low solid solubility of the metal laminate composite plate, there are interface difficult to composite or low bonding strength and other issues. In the process of strong plastic deformation of metals, ultrasound can reduce the yield and flow stress of metal materials and the energy barrier of element diffusion, promote the coordinated deformation of dissimilar metals and interfacial metallurgical bonding, and improve the molding performance of metal materials, but due to the limitation of ultrasonic energy propagation, ultrasonic assisted rolling composite molding is only applied to foil materials, and it can not be applied to the metal laminated composite plate with a wider range of applications. However, limited by the effect of ultrasonic energy dissipation, ultrasonic-assisted roll composite forming is currently only applied to foils, and cannot yet be applied to the more widely used metal laminated composite sheets. Based on this, the project proposes the development of multi-ultrasonic superposition system assisted millimeter-grade metal laminated composite plate forming technology, will focus on breakthroughs in multi-ultrasonic superposition system assisted metal materials strong plastic deformation key technologies, to solve the multi-ultrasonic superposition system assisted plastic deformation of metal materials under the role of plastic deformation and performance enhancement mechanism and multi-ultrasonic superposition system assisted millimeter-grade metal laminated composite plate rolled under the role of coordinated deformation and interfacing mechanism. Combination mechanism of two key scientific issues. Focusing on the above key scientific issues and key technical issues, this project intends to construct a multi-ultrasonic superposition system model, clarify the ultrasonic wave propagation mechanism, elucidate the metal flow law and the proliferation, migration and annihilation behavior of internal defects in the plastic forming process of metal materials assisted by the multi-ultrasonic superposition system, reveal the influence of multi-ultrasonic superposition on the coordinated deformation of metal laminated composite plate rolling and the interfacial bonding, and develop the multi-ultrasonic superposition system assisted rolling and the interfacial bonding mechanism. Ultrasonic superposition system assisted roll forming millimeter metal laminated composite plate technology and forming equipment, to achieve magnesium/aluminum, copper/steel and other high-performance millimeter metal laminated composite plate of high efficiency preparation, in order to meet the aerospace, rail transportation and national defense and military and other fields of high-performance millimeter metal laminated composite plate of the urgent need to provide technical support and theoretical basis.