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
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growth
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microstructure
,
Nb_3Sn
,
Nb_6Sn_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
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