(北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，北京 100022)
摘 要: 通過(guò)溫軋及退火制備了強(qiáng)立方織構(gòu)的Ag基帶，通過(guò)冷軋及退火制備了強(qiáng){110}雙軸織構(gòu)的Ag基帶，為高溫涂層超導(dǎo)提供了很好的基帶材料。探討了Ag基帶中立方織構(gòu)和{110｝雙軸織構(gòu)的形成機(jī)理。得到立方織構(gòu)的關(guān)鍵是軋制時(shí)盡量使形變過(guò)程以滑移為主，從而有較高的C取向，通過(guò)動(dòng)態(tài)再結(jié)晶首先出現(xiàn)立方織構(gòu)晶核。得到{110｝雙軸織構(gòu)的關(guān)鍵是利用Ag冷軋時(shí)黃銅取向易以孿晶方式形變的特點(diǎn)，保持B取向的穩(wěn)定；再結(jié)晶退火時(shí)，利用其首先形成退火孿晶的特性，隨后的擴(kuò)散長(zhǎng)大即以此為核心形成較強(qiáng)的{110｝雙軸織構(gòu)。在所制備的強(qiáng){110｝<112>雙軸織構(gòu)的銀帶上，用PLD方法直接沉積的YBCO超導(dǎo)薄膜，Jc值達(dá)到(2～6)×105A/cm2(77 K，0T)。
關(guān)鍵字: 高溫超導(dǎo)薄膜；Ag帶；立方織構(gòu)；{110｝雙軸織構(gòu)；孿晶
（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
