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中南大学学报(自然科学版)

Journal of Central South University

第31卷    第1期    总第131期    2000年2月

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文章编号:1004-0609(2000)01-0005-07
高温超导Ag基带的织构研究
刘丹敏,周美玲,郭汉生,胡延槽,左铁镛

(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

Texture control of silver substrates for  high temperature superconductor
LIU Dan-min, ZHOU Mei-ling, GUO Han-sheng, HU Yan-cao, ZUO Tie-yong

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

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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