funded by the National Natural Science Foundations of China(Nos.52075449,51975480 and U1737205);the Aeronautical Science Foundation of China(No.20185470007)。
TiAlNb based intermetallic alloys,a potential competitor for next-generation super alloys,are susceptible to high-temperature embrittlement due to nucleation of a metastable single B2 phase in the fusion zone(FZ)durin...