Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor
Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor
复制标题
DOI：
10.1088/0953-2048/20/3/015
复制
发表时间：
2007-03
影响因子：
3.6
通讯作者：
Shojiro Ochiai;H. Rokkaku;K. Morishita;J. Shin;S. Iwamoto;H. Okuda;M. Hojo;K. Osamura;M. S
中科院分区：
文献类型：
--
作者：
Shojiro Ochiai;H. Rokkaku;K. Morishita;J. Shin;S. Iwamoto;H. Okuda;M. Hojo;K. Osamura;M. S
提出了一种估算Bi2223/Ag/Ag合金复合超导体在变温条件下热致残余应变积累的方法，该方法利用不同残余应变状态下样品的应力-应变曲线测得的力学性能值、x射线衍射测得的室温下复合带中Bi2223丝的残余应变值以及所报道的组分的热膨胀系数(Bi2223，在相应的温度范围内加入Ag和Ag合金。应用该方法估计了美国超导公司生产的高临界电流型复合带各组分的残余应变随温度的变化。用该方法估计的77 K时的残余应变值和报道的Bi2223细丝的断裂应变能很好地解释77 K时临界电流的应变容限。
A method to estimate the thermally induced residual strain accumulation under varying temperature in a Bi2223/Ag/Ag alloy composite superconductor was presented, in which the mechanical property values measured from the stress–strain curves of the samples with different residual strain states, the residual strain value of Bi2223 filaments in the composite tape at room temperature measured by x-ray diffraction and the reported coefficients of thermal expansion of the constituents (Bi2223, Ag and Ag alloy) in the relevant temperature range were incorporated. This method was applied to estimate the change of the residual strain of all constituents of the high critical current type composite tape fabricated by American Superconductor Corporation as a function of temperature. The residual strain value at 77 K estimated by this method and the reported fracture strain of Bi2223 filaments accounted well for the measured strain tolerance of the critical current at 77 K.