Effects of initial cold work conditions on the deformation and current capacity of monofilamentary and multifilamentary Bi-2223 conductors

被引:11
作者
Lee, DF [1 ]
Martin, PM [1 ]
Kroeger, DM [1 ]
Rupich, MW [1 ]
Li, Q [1 ]
Riley, GN [1 ]
机构
[1] AMER SUPERCONDUCTOR CORP,WESTBOROUGH,MA 01581
关键词
D O I
10.1088/0953-2048/10/9/011
中图分类号
O59 [应用物理学];
学科分类号
摘要
The influences of initial cold work conditions on the deformation characteristics and the current-carrying capability of Bi-2223 powder-in-tube conductors have been investigated by varying the working friction and the amount of reduction per pass. The results demonstrate that deformation of the conductors can be very inhomogeneous depending on the working parameters. Specifically, dead zones are found within the transverse cross-sections of the tapes close to the tools-sample interfaces such that the bulk of the deformation is restricted to the central portions of the conductors. Since the core of monofilamentary tape is located outside the dead zones, it is highly densified when deformed under high friction condition resulting in the largest J(c). On the other hand, a large number of filaments in multifilamentary tape reside within the dead zones such that high working friction does not result in optimum J(c). Instead, a combination of low friction and large reduction per pass resulted in the most homogeneous deformation and highest current capacity.
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页码:702 / 711
页数:10
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共 22 条
[21]   MICROSTRUCTURAL STUDY OF BI(2223)/AG TAPES WITH JC(77-K, 0 T) VALUES OF UP TO 3.3X10(4)A CM-2 [J].
YAMADA, Y ;
OBST, B ;
FLUKIGER, R .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 1991, 4 (04) :165-171
[22]   EFFECT OF DEFORMATION OF PARAMETERS ON INTERFACE MORPHOLOGY OF SILVER-SHEATHED HIGH-TEMPERATURE SUPERCONDUCTOR TAPES [J].
ZEIMETZ, B ;
PAN, A ;
DOU, SX .
PHYSICA C, 1995, 250 (1-2) :170-174