To provide a cast and hot isostatically pressed turbo-machine airfoil that has fewer or no surface irregularities.

A cast and hot isostatically pressed gamma titanium aluminide turbine blade 26 has an airfoil portion 38 including a concave pressure surface 44 and a convex suction surface 46. The concave pressure surface 44 has surface irregularities that are produced by the action of the hot isostatic pressing process on voids located within the cast turbo-machine airfoil and that are located in a region 50 of the concave pressure surface 44 where in operation aerodynamic separation occurs to minimize the aerodynamic effects of the surface irregularities upon the operation of the turbine blade 26. The remaining portion of the concave pressure surface 44 and the whole of the convex suction surface 46 are free of surface irregularities.