Microstructure and formation mechanisms of TiNiNb amorphous powder prepared by mechanical alloying

•The results show that the amorphous phase began to appear when the time reached 30 h.•When the milling time reached 50 h, the amorphous content was about 99% and tended to be stable.•When the ball milling reached 70 h, the average size of powder particles gradually obtained stabilization.