(北京工业大学 材料科学与工程学院，北京 100022)
摘 要: 通过温轧及退火制备了强立方织构的Ag基带，通过冷轧及退火制备了强{110}双轴织构的Ag基带，为高温涂层超导提供了很好的基带材料。探讨了Ag基带中立方织构和{110｝双轴织构的形成机理。得到立方织构的关键是轧制时尽量使形变过程以滑移为主，从而有较高的C取向，通过动态再结晶首先出现立方织构晶核。得到{110｝双轴织构的关键是利用Ag冷轧时黄铜取向易以孪晶方式形变的特点，保持B取向的稳定；再结晶退火时，利用其首先形成退火孪晶的特性，随后的扩散长大即以此为核心形成较强的{110｝双轴织构。在所制备的强{110｝<112>双轴织构的银带上，用PLD方法直接沉积的YBCO超导薄膜，Jc值达到(2～6)×105A/cm2(77 K，0T)。
关键字: 高温超导薄膜；Ag带；立方织构；{110｝双轴织构；孪晶
（School of Materials Science and Engineering, Beijing Polytechnic University, Beijing 100022, P.R.China）
Abstract:The silver tape with {100｝<100> texture was obtained by hot rolling and subsequent annealing. A {110} biaxially textured silver tape was obtained by cold rolling and subsequent annealing. The formation regulations of the cube texture and the {110} biaxially texture in the silver tape were investigated. Cube texture can be obtained by hot-rolling. In the process of rolling, twin must be avoided in order to increase the strength of the C orientation. The crystals in C orientation turn into cube orientation by dynamic recrystallization. A strong single orientation {110} texture can be formed by cold-rolling and recrystallizing annealing. In the process of cold-rolling, dynamic recrystallization must be avoided in order to maintain the stability of the B orientation. When cold-rolled Ag tapes were recrystallizing annealed in high temperature, a strong single orientation {110} texture can be formed. YBCO was deposited by pulsed laser deposition (PLD) on the silver foil with texture {110｝<211>. The transport currents measured for the films were (2～6)×105A/cm2 at 77 K, 0T.
Key words: film of high temperature superconductors; silver tape; cube texture; {110} biaxial texture; twinning
