Beta-gamma high Nb-TiAl alloy with excellent high-temperature deformation capacity

The invention provides a beta-gamma high Nb-TiAl alloy with an excellent high-temperature deformation capacity and belongs to the field of metal materials. The alloy is composed of Ti, Al, Nb, B, Y and beta-phase stable elements (Mn, Cr, Mo and V), wherein the content of Al is 40-44at%, the content of Nb is 6-10at%, the content of B is 0.1-0.3at%, and the content of Y is 0.1-0.3at%. The single adding quantity of Mn and Cr is 0.5-3.0at%, the single adding quantity of Mo and V are 0-2.0at%, the total adding quantity is 1.0-7.0at%, and the balance is Ti. The alloy structure is mainly composed ofa gamma phase and a beta phase, the content of an alpha-shape is low and 2.0-5.0%, and the cast alloy structure is fine and uniform isometric crystal. The beta-gamma high Nb-TiAl alloy with the excellent high-temperature deformation capacity has the advantages that the beta-phase stable elements are added, the content of the beta-phase is increased, the Nb-TiAl alloy high-temperature deformation capacity is improved, and