Three different ribbons of amorphous Til 1?x Be x alloys such as Ti 0.59 Be 0.41 ,Ti 0.61 Be 0.39 andTi 0.63 Be 0.37 were made by melt-spinning method to be used as brazing filler metals for joining Zircaloy-4 nuclear fuel cladding tubes, and their crystallization behavior as well as microstructure of the brazed zone were examined. The crystallization behavior was investigated in teams of thermal stability, crystallization temperature and activation energy. The crystallization of the Ti 1?x Be x alloys proceeded in two steps by the formation of α -Ti at a lower temperature and of TiBe at a higher temperature. The crystallization temperature and activation energy of Ti 1?x Be x alloys were higher and larger than those of Zr 1?x Be x alloys and PVD Be. Those resulted thinner joining layer with Ti 1?x Be x alloys, which kept sound thickness of Zircaloy-4 nuclear fuel cladding tubes after brazing. But in the brazed zones made by Ti 1?x Be x filler metals, a little solid-solution layers composed of Zr and Ti were formed toward the Zr cladding tube and Zr was detected in the brazed zones. Microstructure of brazed zone was changed from globular to dentrite with decreasing Be content in the Ti 1?x Be x filler metal.