Method for forming hollow profile non-circular extrusions using shear assisted processing and extrusion (ShAPE)
A process for forming extruded products using a device having a scroll face configured to apply a rotational shearing force and an axial extrusion force to the same preselected location on material wherein a combination of the rotational shearing force and the axial extrusion force upon the same location cause a portion of the material to plasticize, flow and recombine in desired configurations. This process provides for a significant number of advantages and industrial applications, including but not limited to extruding tubes used for vehicle components with 50 to 100 percent greater ductility and energy absorption over conventional extrusion technologies, while dramatically reducing manufacturing costs.
1. A shear assisted extrusion process for producing high entropy alloys; the process comprising the steps of:
positioning preselected high entropy pre-cursor materials in contact with a rotating scroll pattern on a face of a rotating die within a shear assisted extrusion device, the scroll pattern including grooves configured to draw material into an aperture of the die; and
simultaneously applying a rotational force and an axial force upon the pre-cursor materials by rotating the scroll face and pushing the scroll face into the pre-cursor materials sufficient to cause plasticization and mixing of the pre-cursor materials at an interface of the rotating scroll pattern with the pre-cursor materials thereby homogenizing and consolidating the pre-cursor materials into a high entropy alloy that is extruded through the aperture of the rotating die.
2. The process of claim 1 wherein the rotating scroll face has at least two starts.
3. The process of claim 2 wherein the rotating scroll face rotates at a rate of 10-1000 rotations per minute.
4. The process of claim 2 wherein the rotational shearing force is less than 50 MPa.