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Nb_6Sn_5生成Nb_3Sn的生长特性

罗乐 , 胡素辉

金属学报

采用Nb管富Sn固-液相扩散法,研究了Nb_6Sn_5向Nb_3Sn转化过程中Sn的扩散方式及微组织结构.实验结果表明:Nb_3Sn层生长受Nb_6Sn_5分解时Sn的短程扩散和长程扩散两种机制的控制,分别形成晶粒较粗的内层和晶粒较细的外层;粗细晶粒的差别和热处理温度有关.根据此机制得出的扩散方程解与Nb_3Sn生长曲线符合得很好.

关键词: 扩散 , growth , microstructure , Nb_3Sn , Nb_6Sn_5

超导材料的几何构形对Nb_3Sn扩散生长的影响

罗乐 , 胡素辉

金属学报

采用体扩散模型,假定Sn在CuSn母体中的扩散是Nb_3Sn层生长的控制因素,考虑了青铜法和Nb管富Sn法这两种典型的成材方法的几何构形所形成的边界条件,在一级近似下解出了Nb_3Sn层厚度和热处理时间的依赖关系。结果表明:Nb_3Sn层生长速率与超导材料的复合构形、Nb纤维以及CuSn母体的几何参数有内在联系。理论与实验结果定性相符。

关键词: 超导材料 , geometrical configuration , kenetics of diffusion , growth rate , null

GROWTH OF Nb_3Sn TRANSFORMED FROM Nb_6 Sn_5

LOU Le HU Suhui Shanghai Institute of Metallurgy , Academia Smica , Shanghai , China Shanghai Institute of Metallurgy , Academia Sinica , Shanghai , China

金属学报(英文版)

The diffusion process of Sn in the transformation of Nb_6Sn_5 to Nb_3Sn has been studied.The experimental results show that the growth of Nb_3Sn laver is controlled by two processes,i.e. the short range diffusion of Sn which is responsihle for the inner layer with large grains,and the long,range diffusion of Sn which results in the outer layer with fine grains.It was found thai grain size depends on the reaction temperature.A model of Nb_3Sn growth based on the above processes was established and its solution was found to be in good agreement with ex- perimental results.

关键词: diffusion , null , null , null , null

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