The typical SEM microstructure of an excellent critical current density NbTi/Cu superconductor is found to have a very fine and clear subband as well as a homogeneously-distributed plate-like precipitate.

• 优异临界电流密度NbTi/Cu超导体的典型SEM显微结构呈现出很细微、清晰的亚带与均匀分布的片状沉淀相。