Turbomachine rotor wheel having composite material blades

A turbomachine rotor wheel having composite material blades, comprising:

• a slideway disk having at its outer periphery a circumferential groove presenting an opening that is narrower than its bottom;
• a plurality of blades of composite material, each blade having a blade root engaged in the groove of the slideway disk and presenting a longitudinal section that is adapted to a longitudinal section of the groove of the slideway disk so as to be held radially therein by co-operating shapes, and a platform for defining a portion of an inner wall of a flow passage for a gas stream passing through the rotor wheel;
• and
• an orientation disk having at its outer periphery a substantially longitudinal portion with a plurality of axial slots, each open at one end and each presenting a cross-section matching a cross-section of a blade root so as to hold the root angularly by co-operating shapes, the orientation disk being mounted on the slideway disk so that its longitudinal portion is received radially between the blade platforms and the opening of the groove of the slideway disk.