In the present paper, the microstructures of directionally solidified Ti–(43–48)Al–2Cr–2Nb alloys prepared by electromagnetic cold crucible directional solidification technique were studied in detail. The results show that with the decrease of Al content, the interlamellar spacing of α 2 /γ decreases, but the volume fraction of B 2 phase increases. In addition, the fracture toughness of these alloys with different lamellar orientation was investigated by single edge notched beam three-point bending test (SENB). It is revealed that B 2 phase has greatly impacted on the fracture toughness. When the laminates are perpendicular to the loading stress, the increasing of B 2 phase leads to a lower fracture toughness value. On the contrary, B 2 phase becomes barriers for crack propagations and increases fracture toughness value when the laminates are parallel to the loading stress.