近年来，为了获得高性能第二代高温超导带材，制备高强度、无磁性、强织构的新型高钨含量（外层钨含量大于7at.%）镍钨合金复合基带成为人们研究的热点之一。目前如何在这种镍钨合金复合基带表面获得强立方织构和理解再结晶织构演变的规律仍是一项极具挑战的任务，也是制约其产业化的主要瓶颈。本课题将首次引入溶质原子扩散思路，通过对材料结构和成分的精确设计，提出并制备外层具有强立方织构、整体实现无磁性和高强度的扩散型高钨含量Ni-8at.%W/Ni-12at.%W/Ni-8at.%W合金复合基带；拟通过研究复合基带形变与低温回复组织的演变机制，分析基带再结晶形核和晶粒长大动力学及再结晶过程中晶界迁移和变化规律；通过研究复合基带内外层间比和厚度对截面各区域剪切组织形成的影响，建立内外层元素扩散模型和构建轧制与立方取向的关系，最终系统阐述和归纳扩散型高钨含量镍钨复合基带再结晶织构演变和强立方织构形成的机制。

In recent years, the novel Ni-W alloy composite substrates with high content of W element (the content of W in outer layer of the composite substrate is more than 7 at.%) are considered to be the most promising substrate material for the second generation of high-temperature superconducting tapes with high performance, because they are characterized by higher mechanical strength, no-ferromagnetism and sharper cube texture than that of the more commonly used Ni-based substrates. However，how to develop sharp cube texture and to understand the mechanism of recrystallization texture evolution in these substrates are still the challengable missions so far, and these difficulties are also the major factors in restricting their industrial applications. In this project, a novel model of solute diffusion has been proposed for the first time. Through a precise design of the appropriate material structure and elemental component, the diffusion typed Ni-8at.%W/Ni-12at.%W/Ni-8at.%W alloy composite substrates with high content of W, high strength, no-ferromagnetism as well as sharp cube texture will be fabricated using this processing model. The evolution of deformation texture and microstructure during cold rolling process will be investigated, and the recovery process of the highly deformed samples will be characterized, which are used to well understand the mechanism of the deformation and recovery processes for these novel composite substrates. The nucleation and grain growth of the recrystallization process will be studied via analysis of the texture and microstructure transition as well as the migration of the grain boundaries during annealing. In addition, the effect of the substrate thickness, interbedded ration as well as the elemental diffiusion on the shear structure in the different depth of the cross section will be invesigated in order to understand the relevant relationship between the cube texture formation and the diffusion in the outer and inner layers of the composite substrate. Furthermore, the theoretical model of texture evolution and elemental diffusion will be established. Consequently, the mechanism of recrystallization texture evolution and cube texture formation in diffusion typed-composite substrates with high W content will be systematically elaborated and proposed.