摘要:
A method for forming a friction stir welded assembly is provided, as is an associated component assembly formed according to such a method. The method includes coating surface portions of one or more untreated articles with a coating material. Thereafter, the articles are friction stir welded to form an assembly. A thermal treatment is performed before or after the welding operation, e.g., to simultaneously heat treat the articles and cure the coating.
摘要:
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).
摘要:
An apparatus and method are provided for angularly extruding a workpiece through a die to form blanks and articles having refined grain structure. The die is also used to form the workpiece to a desired shape, such as a cylinder. The angular extrusion method can be used in place of some heat treatments, thereby lowering the cost and time for manufacturing articles. The method is compatible with materials with high strength-to-weight ratios such as aluminum, titanium, and alloys thereof. The blanks can be used to form articles having favorable mechanical properties such as strength, toughness, formability, and resistance to fatigue, corrosion, and thermal stresses.
摘要:
A method for preparing ultra-fine, submicron grain titanium or titanium-alloy articles (78) used for joining or assembling of detail components. Coarse-grained titanium or titanium-alloy materials (52) are severely mechanically deformed using cryogenic milling into an ultra-fine, submicron grain powder, degassed and consolidated under controlled pressure and temperature. The resulting fasteners, articles, or components manufactured from such material have improved material performance characteristics associated with this ultra-fine, submicron grain material structure.
摘要:
The invention is a high-strength, pre-coated, titanium or titanium-alloy material component comprising a titanium or titanium-alloy material article having ultra-fine, submicron grain size microstructure and an organic coating of phenolic resin applied to the surface of the article. The article is prepared from a coarse grain titanium or titanium-alloy powder material that is cryomilled into an ultra-fine, submicron grain material, degassed, and densified. The densified material is formed or otherwise processed into a article, and pre-coated with an organic coating containing phenolic resin prior to installation or assembly.
摘要:
A test method for determining, quantifying, and qualifying the flow characteristics of a sealant material compound comprising the steps of applying a uniform layer of known initial mass of sealant material between two test surfaces and compressing the sealant material between the surfaces at a specific pressure for a specific length of time, and at a specific temperature, causing an amount of sealant to be extruded from between the test surfaces. The amount of the extruded sealant is measured and compared to the total mass of initial sealant material to determine the ratio of the extruded to initial sealant material. Based upon the mass ratio of extruded sealant material versus the initial sealant material, the flow characteristics of the sealant material may be expressed for any given combination of temperature, pressure, and duration and compared to other sealant materials.
摘要:
A test method for determining, quantifying, and qualifying the stress-relaxation characteristics of a sealant material compound comprising applying a sealant material layer between a first plate and a second plate, disposing a fastener assembly through the plates, and providing tension preload upon the fastener assembly so as to compress the plates together. The elongation of the fastener assembly is measured and the test assembly is heated and cooled under controlled parameters and the elongation of the fastener assembly is again measured. The stress-relaxation of the sealant material compound is correlated to the corresponding change in fastener assembly elongation for the purposes of measuring, quantifying, and qualifying the sealant material compound.
摘要:
The present invention is directed to a method for applying to a substrate, in the form of a seal, a polysiloxane-containing coating, preferably a polysiloxane(amide-ureide) coating capable of inhibiting corrosion as well as the accumulation of ice. One embodiment of the present invention is directed to a polysiloxane(amide-ureide) that forms a durable, long lasting, anti-corrosive and anti-ice coating when applied to a substrate as a seal.
摘要:
The invention is a high-strength, pre-coated, aluminum or aluminum-alloy component comprising an aluminum or aluminum-alloy article having ultra-fine, submicron grain microstructure and an organic coating of phenolic resin applied to the surface of the article. The article is prepared from a coarse grain aluminum or aluminum-alloy material that is cryomilled into an ultra-fine, submicron grain material, degassed, and densified. The densified material is formed into an article, and coated with an organic coating containing phenolic resin prior to installation or assembly.
摘要:
A high-strength, corrosion- and heat-resistant aircraft structural component such as a fastener is prepared by providing a corrosion-resistant stainless steel or heat-resistant superalloy metallic component precursor that is not in its final heat-treated state, and coating with an aluminum-containing, curable polyaromatic phenolic coating material having a non-volatile portion that is predominantly organic and is curable at about the high-strength metallic alloy component's stress equalizing tempering temperature. The coated, high-strength metallic-alloy component is then thermally treated to concurrently impart pre-determined metallurgical properties to the finished, metallic substrate, and cure the organic, aluminum-containing coating.