354 results about "Friction stir processing" patented technology

A low-temperature friction-based coating method termed friction stir fabrication (FSF) is disclosed, in which material is deposited onto a substrate and subsequently stirred into the substrate using friction stir processing to homogenize and refine the microstructure. This solid-state process is capable of depositing coatings, including nanocrystalline aluminum and/or metal matrix composites and the like, onto substrates such as aluminum at relatively low temperatures. A method of making rod stock for use in the FSF process is also disclosed.

Solid state processing is performed on a workpiece that operates alone or is a component of equipment used in various demanding, harsh and wearing environments in which failure of a product could compromise safety or the environment or otherwise result in significant cost for repair or replacement, wherein the solid state processing performed by using a tool capable of friction stir processing, friction stir mixing, or friction stir welding results in a workpiece that offers a longer life-cycle and/or improved performance and/or improved reliability as a result of the solid state processing.

Solid state processing is performed on a workpiece by using a tool capable of friction stir processing, friction stir mixing, or friction stir welding, wherein solid state processing modifies characteristics of a workpiece while substantially maintaining a solid phase in some embodiments, allowing some elements to pass through a liquid phase in other embodiments, and wherein modified characteristics of the material include, but are not limited to, microstructure, macrostructure, toughness, hardness, grain boundaries, grain size, the distribution of phases, ductility, superplasticity, change in nucleation site densities, compressibility, expandability, coefficient of friction, abrasion resistance, corrosion resistance, fatigue resistance, magnetic properties, strength, radiation absorption, and thermal conductivity.

An apparatus for a friction stir and a friction stir processing of the present invention suppress an occurrence of a surface defect in an area processed by the friction stir. The apparatus for the friction stir includes a tool having a columnar tip-side part, a rotating unit for rotating the tool on a central axis, a first pressing unit for pressing a tip of the tool rotated by the rotating unit against a work, a jig having a tool insertion hole into which the tip-side part of the tool is inserted so that the tip-side part of the tool is encircled around the jig, a second pressing unit for slidably pressing the jig against the work, and a press control unit for controlling the first pressing unit so that the tip-side part of the tool is gradually pulled out of the work by the first pressing unit while moving the tool and the jig relative to the work, in a state that the tool is rotated by the rotating unit and the tip of the tool has been sunk into the work to a predetermined depth by the first pressing unit.

A friction stir tool is provided to perform friction stir riveting using a partially consumable pin, wherein the pin includes a cutting edge on a bottom surface thereof, wherein the tool is rotated at a first speed to enable cutting by the pin into a first material that is overlapping a second material, wherein after the pin has cut to a sufficient depth, the rotational speed of the tool is increased to thereby enable plasticization of the consumable pin, the first material, and the second material, wherein the tool is then rapidly decelerated until stopped, enabling diffusion bonding between the pin, the first material and the second material.

Local heat may be generated through surfaces of sheet metal workpieces by supporting the workpiece(s) on a hard surfaced anvil and engaging the opposite surface of the workpiece with a rotating, and optionally translating, friction stir tool that is pressed against the work surface. Advantages are realized in friction stir processing (e.g. seam or spot welding) of such sheet metal workpieces by using an anvil with appreciable thermal conductivity, or a liquid cooled anvil body, to suitably cool the site(s) of the workpiece engaged by the friction stir tool to minimize or eliminate distortion of the workpiece.

A method of selecting a geometry for a friction stirring tool, said tool having a melting point that is higher than the workpiece material, wherein the tool is placed in motion against the workpiece to generate heat in the workpiece such that workpiece material is transported in surface features of the tool, and wherein surface features manage workpiece material flow around the tool, and wherein the tool can be used in friction stir processing, friction stir mixing, friction stir welding, and friction stir spot welding of high melting temperature materials or high softening temperature materials.

Additive friction stir methods for joining materials are provided. The methods comprise providing first and second substrates to be joined; providing a forming plate comprising one or more forming cavities; placing the first and second substrates in communication with the forming plate; placing the first and second substrates in communication with each other; rotating and translating an additive friction-stir tool relative to the substrates; feeding a filler material through the additive friction-stir tool; deforming the filler material and the first and second substrates; and extruding one or more of the filler material and the first and second substrates into one or more of the forming cavities of the forming plate. Interaction of the friction-stir tool with the substrates generates plastic deformation at the joint to weld the substrates at the joint. The methods include introduction of reinforcing material at the joint through addition of the filler material.

A fastener component is formed from aluminum or aluminum-alloy material having a head portion and an elongate shank portion, the shank portion having an end and intermediate or transition region. At least the shank portion of the fastener is cold-worked or heat-treated to an intermediate hardness stage, typically to a T6 condition. The intermediate region of the shank portion is further cold-worked to harden or strengthen the intermediate region of the shank portion with respect to the end of the shank, typically to a T8 condition. The aluminum or aluminum-alloy material of the component advantageously has ultra-fine grain size of less than about 5 microns. The ultra-fine grain size is advantageously obtained by friction stir processing (FSP) or equal angle extrusion (EAE).

A method for joining materials using additive friction stir techniques is provided. The method joins a material to a substrate, especially where the material to be joined and the substrate are dissimilar metals. One such method comprises (a) providing a substrate with one or more grooves; (b) rotating and translating an additive friction-stir tool relative to the substrate; (c) feeding a filler material through the additive friction-stir tool; and (d) depositing the filler material into the one or more grooves of the substrate. Translation and rotation of the tool causes heating and plastic deformation of the filler material, which flows into the grooves of the substrate resulting in an interlocking bond between the substrate and filler material. In embodiments, the depositing of the filler material causes deformation of the grooves in the substrate and an interlocking configuration between the grooves of the substrate and the filler material results.

Friction stir processing is applied to an aluminum-scandium alloy workpiece in either a wrought or cast state including scandium-containing precipitates. The process selectively modifies the microstructure of the aluminum-scandium workpiece, for example, by reducing grain size and recrystallization of the substrate. Benefits include increased physical properties of the aluminum-scandium alloys as well as the ability to form unique alloy structures.

The invention relates to a method for preparing a composite high-speed steel wear-resistant layer on the surface of an aluminum alloy. First, a high-speed steel coating with a thickness of 0.2 mm to 1.5 mm is thermally sprayed on the surface of an aluminum alloy, and then the thermally sprayed high-speed steel is processed by friction stir processing. The coating is evenly inlaid and fused in the aluminum alloy surface layer to form a good wear-resistant layer, and a metallurgical bond is formed between the coating and the substrate. In the invention, the thermal spraying coating is evenly inlaid and fused in the surface layer of the aluminum alloy through friction stirring processing to form a good wear-resistant layer, and a metallurgical bond is formed between the coating and the substrate. The hardness of the wear-resistant layer of the high-speed steel obtained by the invention is greater than 520HV, and the bonding strength is greater than 70MPa.

A friction stir processing tool and method for manufacturing the same are provided. The tool includes a non-consumable, interchangeable friction stir probe body. The tool includes a material flow path defined by an outer surface of a probe body, which has a non-linear, continuous, monotonically-decreasing axial profile. The probe body is adapted to engage a workpiece material to perform a friction stir process by rotating about an axis thereof thereby directing a weld material toward a distal end of the probe body along the flow path. The flow path varies in pitch as the lateral cross-sectional dimension of the probe body decreases toward the distal end thereby causing the weld material to maintain a controlled speed as it travels along the flow path. Geometric surface features such as threads, helical grooves, ridges, flutes, and/or flats, integrated with the probe body may define the flow path.

A method for developing fine grained, thermally stable metallic material in which friction stir welding or friction stir processing is performed along at least a portion of the material. Thereafter, a thin layer is removed from either side, or both sides of the material to eliminate the origin of abnormal grain growth occurring when the friction stir welded or friction stir processed material is subjected to subsequent hot forming processes. A sheet of extraneous material is optionally attached to either side, or both sides of the material prior to the friction stir welding or friction stir processing, and this extraneous material is removed after the friction stir welding or friction stir processing. A layer containing pinning particles or a sheet of extraneous material containing pinning particles is further optionally introduced on either side, or both sides of the material prior to the friction stir processing.

A method for preparing an aluminum-based composite material plate by friction stir comprises the following steps of: (1) forming a plurality of holes on an aluminum plate of base material, and placing reinforcing particles in the holes, thus forming an intermediate plate; (2) holding and arranging the intermediate plate between aluminum plates of surface layer, the component of which is the same with that of the aluminum plate of base material, thus forming a composite plate; (3) carrying out friction-stir processing to the composite plate by utilizing a stirring head, thus obtaining the aluminum-based composite material plate. By using the prepared Ti/Al composite plate, Ti particles are distributed uniformly in the plate and refined obviously, and particles of large size are reduced. The prepared aluminum-based composite material has high hardness which is about 2 to 3 times of matrix hardness.

The invention relates to aluminum matrix composites and the field of welding, specially provides a process for improving the strength of a friction stir welding (FSM) joint for discontinuously reinforced aluminum (DRA) matrix composites, which is suitable for DRA matrix composites capable of being subjected to reinforced heat treatment. The process comprises the following steps: carrying out solution treatment on aluminum matrix composites which can be subjected to reinforced heat treatment; after the quenching operation is performed, carrying out friction stir welding on the obtained object within four hours; and carrying out natural ageing or artificial aging on the obtained weld assembly in the air according to the application demands, or carrying out reinforced heat treatment again onthe weld assembly by using a commonly-used industrial process. By using the welding process provided by the invention, the weldability of DRA matrix composites can be improved obviously, the tool wear can be reduced, and the mechanical property of a composite joint can be improved.

Friction stir processing (FSP) modifies the surface microstructure of metals so that thick-section metal workpieces can be bent over large angles without formation of surface cracks. A thick 2519-T8 aluminum plate (25.4 mm thick and 50.8 mm wide) was friction stir processed across the pre-tensile surface to a depth of 6.3 mm, and was then bent at room temperature over a punch with radius 38.1 mm into a v-shaped die to an 80° bend angle. Whereas unprocessed workpieces of this type exhibited surface cracking at 31° bend angle and failed at 40° bend angle, no cracking was evident for the friction stir processed workpiece up to 80° bend angle.

The invention discloses an in-situ reaction method for preparing an aluminum-base composite material. The in-situ reaction method is characterized by comprising arranging at least one groove on the surface of an aluminum material to be processed, and forming a processing area; placing the aluminum material to be processed on a friction stir processing machine tool and fixing the aluminum material by a fixture; filling and compacting packing which is about to be in in-situ reaction with a matrix to generate an enforcement in the grooves, and enabling the packing to be flush with the surface of the aluminum material; and carrying out friction stirring processing for the aluminum plate for multiple times by the aid of a stirrer with the size matching with that of the processing area to obtain the aluminum-base composite material. The aluminum-base composite material prepared by the method has the advantages that sizes of in-situ generated reinforced phases are effectively reduced, and dispersion degree of the in-situ generated reinforced phases is increased.

A method for treating a wear reducing material welded to a surface of a tool used in a wellbore operation that includes friction stirring the wear reducing material into the surface of the tool is disclosed. Method for improving the properties of a wear reducing material on a tool are also disclosed.

A friction stir tool is provided to perform friction stir riveting using a partially consumable pin, wherein the pin includes a cutting edge on a bottom surface thereof, wherein the tool is rotated at a first speed to enable cutting by the pin into a first material that is overlapping a second material, wherein after the pin has cut to a sufficient depth, the rotational speed of the tool is increased to thereby enable plasticization of the consumable pin, the first material, and the second material, wherein the tool is then rapidly decelerated until stopped, enabling diffusion bonding between the pin, the first material and the second material.

The invention discloses an additive manufacturing method of ultrafine-grained materials. The method comprises the steps of firstly, raw material preparing, wherein metal powder and ceramic powder areevenly mixed and are subject to vacuum drying, cold spraying powder is obtained, and the volume ratio of the metal powder to the ceramic powder is 70 to 90 : 30 to 10; secondly, cold spraying deposition forming, wherein the cold spraying powder prepared in the first step is sprayed to a base body or the surface of a pre-deposited body, and a cold spraying deposition body of a ceramic doped metal base composite material is formed; thirdly, stirring friction processing, wherein the cold spraying deposition body is placed on a stirring friction body, a stirring tool is adjusted to be aligned withthe deposition body, under high-speed rotation, and sinks and is pressed into the cold spraying deposition body under high-speed rotation to carry out stirring, the stirring tool head is moved, and covers the whole to-be-machined area to carry out stirring friction machining treatment, and the cold spraying deposition area of an uniform superfine-grained structure is obtained. According to the method, the preparing of the ultrafine-grained materials with the complex shape parts is achieved.