A screw extruder for the continuous extrusion of materials with high viscosity, in particular metals such as aluminum and its alloys. The extruder includes an Archimedes screw (1) rotationally provided within a liner (2) of a screw housing (4) having an inlet (11) for the feeding of the material to be extruded, a compacting or extrusion chamber (5) and an extrusion die assembly with a die (6) which forms the shape of the extruded product (7). The required compaction takes place at the down-stream end of the screw towards the extrusion chamber (5) corresponding to up to 540 of the rotation of the screw, or up to 1.5 turns of the screw flight length. The solid plug of metal formed at the end of the screw and extrusion chamber (5) is restricted from rigid rotation to obtain the required compaction and extrusion pressure.

A screw extruder for the continuous extrusion of materials with high viscosity, in particular metals such as aluminum and its alloys. The extruder includes an Archimedes screw (1) rotationally provided within a liner (2) of a screw housing (4) having an inlet (11) for the feeding of the material to be extruded, a compacting or extrusion chamber (5) and an extrusion die assembly with a die (6) which forms the shape of the extruded product (7). The required compaction takes place at the down-stream end of the screw towards the extrusion chamber (5) corresponding to up to 540 of the rotation of the screw, or up to 1.5 turns of the screw flight length. The solid plug of metal formed at the end of the screw and extrusion chamber (5) is restricted from rigid rotation to obtain the required compaction and extrusion pressure.

A method of processing BMGs in a non-ideal environment (such as air) to create a uniform and smooth surface is provided. By utilizing the contact-line movement and an engineered flow pattern during TPF the method is able to create complex BMG parts that exhibit uniform smooth appearance or even can be atomically smooth. In addition, to mending surface imperfections, this method also eliminates void formation inside the material, allows for the creation of precise patterns of homogeneous appearance, and forms improved mechanical locks between different materials and a BMG.

A method of processing BMGs in a non-ideal environment (such as air) to create a uniform and smooth surface is provided. By utilizing the contact-line movement and an engineered flow pattern during TPF the method is able to create complex BMG parts that exhibit uniform smooth appearance or even can be atomically smooth. In addition, to mending surface imperfections, this method also eliminates void formation inside the material, allows for the creation of precise patterns of homogeneous appearance, and forms improved mechanical locks between different materials and a BMG.

A method for manufacturing a bicycle front fork having a wheel clamping base. The method includes the steps of extruding an aluminum alloy substrate having three rectangular bars, wherein the two of the rectangular bars have assembling segments; cutting the substrate for a blank and placing it into a mold for forging the three rectangular bars into three round bars; placing the blank into another mold for extruding and punching the three round bars to have guide holes; drilling the round bars along the guide holes to form three round tubes; flattening and shrinking openings of two of the three round tubes; molding the assembling segments; downwardly bending the two round tubes having the assembling segments into two fork tubes of a bicycle front fork; punching the assembling segments into locking connection portions for a clamping base of the bicycle front fork.

Shear-assisted extrusion assemblies are provided. The assemblies can include a billet containing assembly containing a billet comprising a billet outer material and a billet inner material in at least one cross-section; a tool operably engaged with the billet; an extrudate receiving channel configured to receive extrudate from the tool, wherein the extrudate comprises extruded outer material and extruded inner material in at least one cross-section, the extruded outer material being the same material as the billet outer material, and the extruded inner material being the same as the billet inner material. Methods for producing multi-material shear-assisted extrudate are also provided.

A superconducting wire comprises a MgB.sub.2 filament, a base material, a high-thermal expansion metal, and a stabilizing material. The high-thermal expansion metal is a metal (for example, stainless steel) having a higher thermal expansion coefficient at room temperature than the MgB.sub.2 and the base material (for example, iron or niobium). The manufacturing method includes a step of packing a mixed powder in a first metal pipe, a step of performing wire-drawing on the first metal pipe formed of the metal to be the base material, a step of producing a composite wire by accommodating the first metal pipe in a second metal pipe formed of the high-thermal expansion metal and the stabilizing material, a step of performing wire-drawing on the composite wire, and a step of performing heat treatment.