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研究了合金元素Zr对Cu-Sn/Nb界面上Nb_3Sn生长动力学的影响。实验表明:在单芯复合材料中加入Zr显著提高了Nb_3Sn层的生长速率,层厚与时间的关系显著超过抛物线规律。这些结果不能仅用内氧化生成的ZrO_2颗粒使晶粒细化来解释,还必须考虑ZrO_2颗粒周围过饱和空位使扩散系数增大等因素。在多芯复合材料中热处理时Cu-Sn基体中Sn量的消耗,显著影响Nb_3Sn的生长。考虑了这一因素的Nb_3Sn生长动力学修正公式能对实验结果进行解释。
The effect of alloying element Zr on the growth kinetics of Nb_3Sn at Cu-Sn / Nb interface was studied. Experiments show that adding Zr significantly improves the growth rate of Nb3Sn layer in single-core composites, and the relationship between layer thickness and time significantly exceeds the parabolic law. These results can not only be explained by the grain refinement of the ZrO 2 particles formed by the internal oxidation, but also the factors such as the increase of the diffusion coefficient due to the supersaturated vacancy around the ZrO 2 particles. The consumption of Sn in the Cu-Sn matrix during heat treatment in multi-core composites significantly affects the growth of Nb 3 Sn. The formula of Nb_3Sn growth kinetics considering this factor can explain the experimental results.