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合金元素对Nb3Sn生长动力学的影响

金属界面组 七室

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合金元素对Nb3Sn生长动力学的影响

金属界面组, 七室

THE EFFECT OF ALLOY ELEMENTS ON THE Nb3Sn GROWTH KINETICS

METAL INTERFACE RESEARCH GROUP, PEKING UNIVERSITY DIVISION No.7
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  • 研究了合金元素Zr对Cu-Sn/Nb界面上Nb3Sn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Nb3Sn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ZrO2颗粒使晶粒细化来解释,还必须考虑ZrO2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Nb3Sn的生长。考虑了这一因素的Nb3Sn生长动力学修正公式能对实验结果进行解释。
    The effect of alloy element Zr on the Nb3Sn growth kinetics at the Cu-Sn/Nb interface has been investigated. Experiments have revealed that the addition of Zr in single core composites increases the growth rate substantially and the variation of the Nb3Sn layer thickness with reaction time obviously exceeds the parabolic law. These results cannot be interpreted fully taking into account the fineness of Nb3Sn grains caused by the ZrO2 particles formed during heat treatment, and it is necessary to consider the increase of diffusion coefficient caused by supersaturation of vaeances around the ZrO2 particles. The depletion of Sn contents in the Cu-Sn matrix of multifilamentary composites during heat treatment greatly influenced the growth rate. The revised formula of growth kinetics gives a satisfactory explanation on the experimental results.
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出版历程
  • 收稿日期:  1978-05-22
  • 刊出日期:  1979-03-20

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