Performance Data of a Multifilamentary Nb3Sn Conductor and Magnet
Grain boundaries are thought to be the most important flux-pinning centers for Nb3Sn without second-phase particles. Relatively fine grained structures are necessary to maximize the critical-current density of these materials. In the absence of second-phase particles, such as Zr and U added to nucleate grains that inhibit their subsequent growth, the grain size of Nb3Sn formed by the bronze diffusion method is considered to be a function of heat treatment variables and the tin content of the bronze matrix . The multifilamentary approach offers the advantage of growing a significant volume of fine-grained material at relatively low reaction time and temperature. An understanding of the effects of heat treatment on Nb3Sn grain structure is essential in properly designing materials and processing to attain optimum properties.
KeywordsReaction Layer Superconducting Magnet Layer Growth Rate Round Wire Nb3Sn Layer
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- 4.M. Suenaga, W. B. Sampson, and T. S. Luhman, Brookhaven National Laboratory, Upton, New York, private communication.Google Scholar