Variable thickness extrusion for variable extrudate product properties

A processed, shear-assisted extrusion product, comprising:

• at least a portion of unfurled, flattened extrudate tubing, the at least a portion including:
• a first axial region extruded from a first portion of a feedstock;
• and
• a second axial region extruded from a second portion of a same feedstock;
• wherein:
• the first and second axial regions have a substantially similar thickness;
• and
• the first region comprises different physical properties than the second region.

A system for solid phase processing (SPP) of a billet or other feedstock, the system comprising:

• an extrusion die including:
• a die face configured to have relative rotational motion relative to a feedstock material;
• and
• a die orifice arranged to establish an outer dimension of an extrudate tubing;
• a first driver configured to apply an axial extrusion force to drive the feedstock material and the die face together, during the relative rotational motion;
• a tapered mandrel extending through the die orifice and slidingly translatable therethrough, the tapered mandrel configured to establish an inner dimension of an extrudate tubing;
• and
• a system controller configured to establish or adjust the rotation of the die face relative to the feedstock material and contemporaneously establish or adjust an axial position of the tapered mandrel, relative to a face of the die modulate an extrusion aperture defined between the die orifice and the tapered mandrel to thereby vary a wall thickness between a first extrudate portion and a second extrudate portion.