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應(yīng)變方式對(duì)Bi-2223/Ag超導(dǎo)帶材中微裂紋的形成及臨界電流的影響
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國(guó)家“863”高技術(shù)研究發(fā)展計(jì)劃（2008AA030601, 2009AA03Z202）；中央高?；究蒲袠I(yè)務(wù)費(fèi)科研專項(xiàng)“研究生科技創(chuàng)新基金”（CDJXS10131156）


Effect of Strain Ways on the Micro-Crack Formation and Critical Current of Bi-2223/Ag Superconducting Tapes
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    摘要:

    對(duì)比研究了拉伸、彎曲和壓縮3種應(yīng)變方式對(duì)Bi-2223/Ag高溫超導(dǎo)帶材中微裂紋的形成以及臨界電流的影響。實(shí)驗(yàn)結(jié)果表明：帶材的臨界應(yīng)變值在不同的應(yīng)變方式作用下表現(xiàn)出明顯的差異。同時(shí)，超導(dǎo)芯中裂紋的擴(kuò)展途徑也有所不同，彎曲時(shí)裂紋從帶材上表面向內(nèi)擴(kuò)展，而拉伸時(shí)裂紋的產(chǎn)生則具有隨機(jī)性。重點(diǎn)討論了帶材內(nèi)部微裂紋的產(chǎn)生機(jī)理，實(shí)驗(yàn)發(fā)現(xiàn)，帶材在拉伸過(guò)程中產(chǎn)生軋向裂紋和橫向裂紋，而在壓縮過(guò)程中以軋向裂紋為主，橫向裂紋較少。正是這兩種裂紋的交互作用導(dǎo)致帶材臨界電流的降低。

    Abstract:

    The effects of different strain ways (tension, bend and compression) on the formation and propagation of micro-cracks and critical current of Bi-2223/Ag superconducting tapes were studied. The results show an obviously differences on the critical strain values of the tapes under various strain ways are presented. Moreover, the propagation ways of the micro-cracks in the superconductor filaments are quite different: the micro-cracks form at the surface and then spread to the center in the bending samples, while the formation of the cracks are at random in the tensile samples. The formation mechanism of micro-cracks in the filaments was mainly discussed. It is found that multitudes of transversal and rolling direction micro-cracks form under tensile deformation. However, predominantly rolling direction micro-cracks and little transversal micro-cracks are found under compressive deformation. It is the interaction of the above mentioned two types of the micro-cracks that leads the degradation of Ic of the tapes.

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陳興品,余曉偉,尚 都,鄭 軍,劉 慶.應(yīng)變方式對(duì)Bi-2223/Ag超導(dǎo)帶材中微裂紋的形成及臨界電流的影響[J].稀有金屬材料與工程,2012,41(7):1206~1210.[Chen Xingpin, Yu Xiaowei, Shang Du, Zheng Jun, Liu Qing. Effect of Strain Ways on the Micro-Crack Formation and Critical Current of Bi-2223/Ag Superconducting Tapes[J]. Rare Metal Materials and Engineering,2012,41(7):1206~1210.]
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  • 收稿日期:2011-07-29
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