Institute of Materials, Shanghai University, Shanghai 200072, China;
Laboratory for Microstructures, Shanghai University, Shanghai 200444, China;
School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051. China;
School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
Zr-Nb; alloy; β-Nb; phase; Phase; interface; Segregation; Atom; probe; tomography;