The Nb₃(Al_1−xSn_x) superconductor with enhanced critical current density (J_c) is prepared by the process of mechanical alloying (MA) and subsequent low‐temperature sintering and the enhancement mechanism of J_c in Nb₃(Al_1−xSn_x) is discussed. The analysis of the flux pinning force implies that there is an additional pinning mechanism apart from grain boundary pinning in Nb₃(Al_1−xSn_x). The existence of dispersed Nb₂Al nanoparticles (<30 nm) in Nb₃(Al_1−xSn_x) is confirmed by microstructure observation. These nanosized Nb₂Al particles can serve as flux pinning centers, which leads to the increase of the flux pinning force as well as the enhancement of Nb₃(Al_1−xSn_x)'s J_c performance.

中文翻译：

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掺锡Nb3Al超导体中的附加助焊剂固定

通过机械合金化（MA）和随后的低温烧结过程以及Nb ₃（Al中的J _c的增强机理），制备了具有增强的临界电流密度（J _c）的Nb ₃（Al _{1- x} Sn _x）超导体。讨论_{1- x} Sn _x）。磁通钉扎力的分析表明，除了Nb ₃（Al _{1- x} Sn _x）中的晶界钉扎以外，还有其他钉扎机制。分散Nb的存在₂的Al纳米颗粒（<30nm）的铌₃通过组织观察确认到（Al _{1- x} Sn _x）。这些纳米级的Nb ₂ Al颗粒可作为助焊剂固定中心，从而导致助焊剂固定力的增加以及Nb ₃（Al _{1- x} Sn _x）的J _c性能增强。