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研究了以Nb,Ti,Ta片为原料制备NbTiTa超导线材的工艺中各次挤压后NbTiTa复合体的微观组织以及复合体中各片层间的扩散行为。结果表明:挤压过程中复合体的温度升高和塑性变形造成的大量晶体缺陷使复合体中Nb,Ti,Ta片间发生了严重的互扩散。由于互扩散复合体中形成了非超导的富Ti区和超导的富Nb区和富Ta区,富Ti区的体积百分数超过30%,而且富Ti区、富Nb区和富Ta区的横界面在挤压和拉拔过程中都最终演变成了条带状。
The microstructures of NbTiTa composites after extrusion and the diffusion behavior among the layers in the composite were studied in the process of preparing NbTiTa superconducting wires by using Nb, Ti and Ta as raw materials. The results show that a large number of crystal defects caused by the temperature increase and plastic deformation of the composite during the extrusion process cause serious interdiffusion among the Nb, Ti and Ta sheets in the composite. Due to the formation of non-superconducting Ti-rich and superconducting Nb-rich and Ta-rich regions in the interdiffusion complex, the volume fraction of Ti-rich regions exceeds 30%, and the Ti-rich regions, Nb-rich regions and Ta-rich regions The cross-section eventually evolves into a ribbon shape during the extrusion and drawing process.