Devices and methods for performing shear-assisted extrusion and extrusion processes

A method for preparing extruded material by shear assisted processing and extrusion, the method comprising:

• providing a stock material in a container for shear-assisted extrusion;
• and
• establishing both axial and rotational force at an interface between a face of a die tool and the stock material to form an extruded material by plasticizing the stock material and flowing the plasticized stock material through the face of the die tool, wherein the face of the die tool is generally perpendicular to the axial force and comprises at least one spiral groove;
• wherein the establishing the axial force comprises:
• initiating an initial axial force between the stock material and the face;
• and
• maintaining a steady state axial force that does not decrease until completion of the extrusion or until stock material depletion, including:
• maintaining the steady state axial force between the stock material and the face for a first period of time;
• and
• decreasing a rotational speed associated with the rotational force while increasing a ram speed associated with the axial force during a second period of time.

A method for shear-assisted extrusion, the method comprising:

• initiating an initial axial force and a rotational force at an interface of a face of a die tool and a face of a stock material, the stock material located in a container for shear-assisted extrusion, wherein the face of the die tool is generally perpendicular to the axial force and comprises at least one spiral groove;
• and
• wherein the method comprises:
• ramping the initial axial force to a steady state axial force while decreasing a rotational speed associated with the rotational force;
• and
• extruding an extruded material from the stock material, wherein the axial force at the interface does not decrease during steady-state extrusion.