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制备具有高强度、低磁性的双轴织构金属基带是获得高性能涂层超导体的基础。目前,传统的Ni5at%W(Ni5W)合金基带已经可以工业化生产,但其立方织构的形成机理尚不明确。以真空熔炼方法制备的大形变量(约99%)冷轧Ni5W合金基带作为研究对象,采用EBSD技术进行表征,系统的研究了其形变织构的演变、再结晶形核和晶粒长大等过程。研究发现,Ni5W合金基带的形变织构为典型的铜型轧制织构;在再结晶初期阶段,立方取向晶粒优先在靠近基带表层的区域形核,且具有一定的尺寸优势,其形核在厚度方向上表现出梯度分布的特点;在完全再结晶阶段,立方取向的晶粒通过“尺寸优势”和“取向长大优势”逐渐吞并其它取向的晶粒,形成强的立方织构。
Preparation of high strength, low magnetic biaxially textured metal matrix is the basis for obtaining high performance coated superconductors. At present, the traditional Ni5at% W (Ni5W) alloy base band has been industrially produced, but the formation mechanism of cubic texture is not yet clear. The large deformation (about 99%) cold-rolled Ni5W alloy substrate prepared by the vacuum melting method was used as the research object and characterized by EBSD technique. The deformation texture, recrystallization nucleation and grain growth process. It is found that the deformation texture of the base band of Ni5W alloy is a typical copper rolling texture. In the initial stage of recrystallization, the cubic grains preferentially nucleate in the region close to the surface of the substrate and have certain size advantages. The nucleation In the complete recrystallization stage, cubic orientation of the crystal grains through the “size advantage ” and “orientation and growth advantages ” gradually swallow other oriented grains, forming a strong cubic Texture.