Abstract
The Nb3(Al1−xSnx) superconductor with enhanced critical current density (Jc) is prepared by the process of mechanical alloying (MA) and subsequent low‐temperature sintering and the enhancement mechanism of Jc in Nb3(Al1−xSnx) is discussed. The analysis of the flux pinning force implies that there is an additional pinning mechanism apart from grain boundary pinning in Nb3(Al1−xSnx). The existence of dispersed Nb2Al nanoparticles (<30 nm) in Nb3(Al1−xSnx) 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(Al1−xSnx)'s Jc performance.
The enhancement mechanism of Jc in Nb3(Al1−xSnx) is discussed. The existence of dispersed Nb2Al nanoparticles (<30 nm) in Nb3(Al1−xSnx) is confirmed. These nanosized Nb2Al particles can serve as flux pinning centers, which leads to an increase of the flux pinning force as well as the enhancement of Nb3(Al1−xSnx)'s Jc performance.