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本文用金相、扫描电镜、X 射线衍射和电子探针方法研究了改良青铜法制作的Nb_3Sn 化合物层生成厚度、扩散速率、晶粒和结构.在含7at.-%Sn 青铜基体中加入微量元素:Mg,Al,Y,并在 Nb 芯材中加入 1Wt-%Zr,加速了 Nb_3Sn 层的生成速率并使其晶粒细化.上述效应以青铜中加入0.1—0.5at.-%Mg 较为明显,Nb芯中加1Wt-%Zr 也能起到类似的效果.但当 Al 含量增加到1at.-%时,将引起青铜加工硬化,试样在较大的形变量下容易开裂。生成的 Nb_3Sn 层呈 A-15结构.在近青铜一侧的 Nb_3Sn 层中含有少量的 Cu,而 Mg,Al 则富集于青铜/Nb_3Sn 界面附近的青铜基体中,Nb_3Sn 层中 Mg,Al 含量甚微。铌芯中的 Zr 会少量地扩散到青铜基体中去.
In this paper, the thickness, diffusion rate, grain size and structure of the Nb_3Sn compound layer prepared by the modified bronze method were studied by means of metallographic examination, scanning electron microscopy, X-ray diffraction and electron probe method. : Mg, Al, Y, and adding 1Wt-% Zr into the Nb core material, accelerating the formation rate of the Nb3Sn layer and refining the grain. The above effect is obvious when 0.1-0.5at .-% Mg is added to the bronze , But addition of 1Wt-% Zr in the Nb core can also play a similar effect, but when the content of Al is increased to 1at .-%, it will cause the work hardening of bronze, and the sample will crack easily under a large amount of deformation. The Nb_3Sn layer is A-15, with a small amount of Cu in the near-bronze Nb_3Sn layer, whereas Mg and Al are enriched in the bronze matrix near the bronze / Nb_3Sn interface. The Mg and Al contents in the Nb_3Sn layer are very high micro. The zirconium in the niobium core will diffuse into the bronze matrix in a small amount.