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A turbine wheel for use in a gas turbine engine having a plurality of blades attached to a rotor disk. Each blade is formed from a composite comprising ceramic matrix material. The blades each include a root that fits within dovetail slots of the rotor disk and cooperates with a blade retention asse

A turbine wheel for use in a gas turbine engine having a plurality of blades attached to a rotor disk. Each blade is formed from a composite comprising ceramic matrix material. The blades each include a root that fits within dovetail slots of the rotor disk and cooperates with a blade retention assembly to couple the blades to the rotor disk.

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1. A turbine wheel for a gas turbine engine, the turbine wheel comprising a disk formed to include a fir tree slot that extends through the disk in an axial direction from a forward side to an aft side of the disk and inwardly in a radial direction from an outer diameter of the disk toward a central

1. A turbine wheel for a gas turbine engine, the turbine wheel comprising a disk formed to include a fir tree slot that extends through the disk in an axial direction from a forward side to an aft side of the disk and inwardly in a radial direction from an outer diameter of the disk toward a central axis, a blade comprising ceramic-containing materials, the blade integrally formed to include an airfoil that extends outwardly in the radial direction from the outer diameter of the disk and a root that extends into the fir tree slot, the root including a stem that extends from the airfoil into the fir tree slot and a retention head arranged in the fir tree slot that extends from the stem, anda blade retention assembly including at least two clamp blocks that cooperate to form a fir tree shape corresponding to the fir tree slot, wherein the at least two clamp blocks engage the retention head of the root and are received in the fir tree slot of the disk so that centrifugal forces applied to the blade when the turbine wheel is rotated about the central axis are transferred from the retention head through the blade retention assembly to the disk, wherein the clamp blocks are shaped to extend radially inward to a point substantially similar to a radially-innermost surface of the blade, and wherein the retention head extends in axially forward and aft direction out from the stem. 2. The turbine wheel of claim 1, wherein the retention head extends circumferentially out from the stem. 3. The turbine wheel of claim 1, wherein the at least two clamp blocks are moveable independent of one another within the fir tree slot. 4. The turbine wheel of claim 1, wherein the at least two clamp blocks are fixed to one another to trap the root of the blade engaged by the at least two clamp blocks. 5. The turbine wheel of claim 4, wherein the at least two clamp blocks are diffusion bonded to one another. 6. The turbine wheel of claim 4, wherein the at least two clamp blocks are diffusion brazed to one another. 7. The turbine wheel of claim 4, wherein the at least two clamp blocks are fixed to one another in positions to exert clamp force on the root of the blade engaged by the at least two clamp blocks when the turbine wheel is stationary. 8. The turbine wheel of claim 7, further comprising at least one compliant member having greater compliance than the at least two clamp blocks and the root of the blade, wherein the at least one compliant member is arranged between at least one of the two clamp blocks and the root of the blade to distribute clamp force applied to the root of the blade by the clamp blocks. 9. A turbine wheel for a gas turbine engine, the turbine wheel comprising a disk formed to include a fir tree slot that extends through the disk,a blade integrally formed to include an airfoil that extends outwardly in a radial direction from an outer diameter of the disk and a root that extends into the fir tree slot, the root including a stem that extends from the airfoil into the fir tree slot and a retention head arranged in the fir tree slot that extends from the stem, anda blade retention assembly including clamp blocks that cooperate to form a fir tree shape corresponding to the fir tree slot, wherein the clamp blocks engage the retention head of the root and are received in the fir tree slot to couple the blade to the disk, wherein the clamp blocks are shaped to extend radially inward to a point substantially similar to a radially-innermost surface of the blade, and wherein the retention head extends in axially forward and aft direction out from the stem. 10. The turbine wheel of claim 9, wherein the retention head extends circumferentially out from the stem. 11. The turbine wheel of claim 9, wherein the clamp blocks are moveable independent of one another within fir tree slot. 12. The turbine wheel of claim 9, wherein the clamp blocks are fixed to one another to trap the root of the blade engaged by the at least two clamp blocks. 13. The turbine wheel of claim 12, wherein the clamp blocks are diffusion bonded to one another or diffusion brazed to one another. 14. The turbine wheel of claim 9, further comprising at least one compliant member having greater compliance than the clamp blocks and the root of the blade, wherein the at least one compliant member is arranged between at least one of the clamp blocks and the root of the blade to distribute clamp force applied to the root of the blade by the clamp blocks. 15. A method of making a turbine wheel for a gas turbine engine, the method comprising clamping a retention head included in a root of a ceramic-containing blade between at least two clamp blocks included in a blade retention assembly, the retention head extending axially forward and aft out from a stem included in the root of the ceramic-containing blade,fixing the at least two clamp blocks to one another to exert clamp force on the retention head of the blade engaged by the at least two clamp blocks,machining the blade retention assembly into a fir tree shape corresponding to a fir tree slot formed in a disk and so that the retention assembly extends to a radial position substantially similar to a radially-innermost surface of the blade, andinserting the retention head and blade retention assembly into the dovetail slot formed in the disk to couple the ceramic-containing blade to the disk,wherein the ceramic-containing blade includes an airfoil arranged outside the blade retention assembly. 16. The method of claim 15, wherein fixing the at least two clamp blocks to one another includes diffusion bonding them to one another. 17. The method of claim 15, wherein fixing the at least two clamp blocks to one another includes diffusion brazing them to one another. 18. The method of claim 15, further comprising positioning at least one compliant member having greater compliance than the at least two clamp blocks and the root of the blade between at least one of the two clamp blocks and the retention head of the blade to distribute clamp force applied to the retention head of the blade by the clamp blocks.