in a circumferential groove in the rotor 1 while guide vanes not shown here are secured in the stator 2 the blades 3 3 u2032 are for example exposed to a pressure of approx 32 bar and a temperature of approx 600 u00b0 c for several thousand hours according to the invention the row of blades illustrated is fitted with two different types of rotor blades 3 3 u2032 to reduce the weight the majority of the rotor blades namely the rotor blades 3 are made of an intermetallic compound preferably a u03b3 titanium aluminide compound the rotor blades 3 u2032 by contrast are made of a material for example a stainless cr u2014 ni steel which is more ductile than the material of the rotor blades 3 at least two more ductile blades 3 of this type which are at a uniform distance from one another in fig1 there are four such blades in this exemplary embodiment are arranged in the row of blades comprising the intermetallic blades 3 in this exemplary embodiment the blades 3 u2032 made of the more ductile material are significantly longer than the intermetallic blades 3 i e in the event of undesirable contact between the blades and the stator during operation these more ductile blades can absorb the frictional forces without any brittle fracture occurring in another variant embodiment it is also possible in order to achieve the same effect for both types of blades 3 3 u2032 to be of the same length.