EffectofIntermediateDeformationontheTexturingofBi2223AgTapes中间变形对Bi2223Ag超导带材织构的影响.pdfVIP

材料研究 中间变形对 Bi2223/ Ag 超导带材织构的影响 1 1 ,2 2 1 1 林 　东 ,易汉平 ,宋秀华 ,刘 　伟 ,刘 　庆 ( 1 清华大学 材料科学与工程系 ,北京 100084 ;2 北京英纳超导技术有限公司 ,北京 100176) 摘要 :借助于扫描电镜和 X 射线衍射分析摇摆曲线 ,研究了 Bi2223/ Ag 单芯超导带材制备过程中中间变形对 Bi 2223 超导相织构的影响。结果表明 ,织构度与中间变形量的关系曲线呈现峰值变化规律。采用轧制进行中间变 形 ,Bi2223/ Ag 单芯带材的变形量 ε 为 143 %时 Bi2223 相织构最佳 ; 采用压制进行中间变形 ,变形量 ε 为 opt opt 107 %时Bi2223 相织构最佳。中间变形后的带材经过最终热处理 ,其 Bi2223 相的织构得到进一步改善。四引 线法临界电流密度测量结果表明 ,其与带材的织构度成正对应关系。 关键词 :Bi2223/ Ag 超导带材 ;Bi2223 超导相 ; 中间变形;X 射线衍射分析摇摆曲线 中图分类号 :TM26 　　文献标识码 :A 　　文章编号 2004) Effect of Intermediate Deformation on the Texturing of Bi2223/ Ag Tapes LIN Dong1 ,YI Hanping1 ,2 ,SONG Xiuhua2 ,LIU Wei1 ,LIU Qing1 ( 1 Department of Materials Science Engineering ,Tsinghua University ,Beijing 100084 ,China ; 2 Innova Superconductor Technology Co. ,Ltd ,Beijing 100176 ,China) Abstract :The effect of intermediate deformation ( ID) on texturing of Bi2223 phase was studied during the manufacturing pro cess of Bi2223/ Ag monofilamentary tapes ,by means of SEM and XRD rocking curve. The results show that there exists a peak value for the degree of texturing as a function of ID reduction. The optimum reduction for intermediate rolling and intermediate pressing is 143 % and 107 % ,respectively. The texturing of the Bi2223 phase was further improved by the final heat treat ment after ID. Moreover ,critical current density of the tapes measured using standard fourterminal techniques was directly pro portional to the texturing of the Bi2223 phase. Key words :Bi2223/ Ag superconducting tape ;Bi2223 phase ;intermediate deformation ;XRD rocking curve 1 　引言