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.
The diffusion process of Sn in the transformation of Nb_6Sn_5 to Nb_3Snhas been studied. The experimentel results show that the growth of Nb_3Sn layer iscontrolled by two processes, i. e. the short range diffusion of Sn which is respon-sible for the inner layer with large grains, and the long range diffusion of Sn whichresults in the outer layer with fine grains. It was found that grain size depends onthe reaction temperature. A model of Nb_3Sn growth based on the above processeswas established and its solution was found to be in good agreement with experimen-tal results.
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