Abstract:
A method of making twin roll cast clad material (17) includes producing a composite material using a liner stock produced by drag casting techniques. The drag cast liner stock (7) can be directly used in a twin roll continuous casting process (5) without additional process steps such as heat treatment, surface cleaning and/or rolling. The drag cast liner stock (7) can be applied to one or both of the surfaces of the twin roll cast material (5) to produce a composite material (17) that is useful in a cast form or can be adapted for reduction by rolling processes or the like. The twin roll cast cladding process can utilize aluminum alloy core and cladding materials to form a brazing sheet from the as-cast composite material. The figure shows the production of twin roll cast clad material (17).
Abstract:
An apparatus for and method of continuous molten material cladding of elongated products such as extrusions includes a molten material cladding apparatus (10) comprising a crucible (1) and a molten material dispensing tool (3) engaged therewith. The crucible and molten material dispensing tool form a chamber (14) to retain molten material, the molten material flowing through passageways (23) in the molten material dispensing tool to form menisci in a bore (21) thereof. An extrusion (33) passing through the molten material dispensing tool punctures the menisci, wherein molten material flows through the molten material dispensing tool and clads the outer surface of the extruded product passing therethrough. By using menisci of molten material, a smooth surfaced, uniform thickness clad product is produced having a wide range of cladding thicknesses.
Abstract:
Strength anisotropy of aluminum-lithium alloy wrought products is reduced by subjecting these types of alloys to improved T8 temper practice. The wrought product, after solution heat treating and quenching, is subjected to a combination of cold rolling and stretching steps prior to aging. The cold rolling can range between 1 and 20 % reduction with the stretching step ranging between 0.5-10 %. The cold rolling step may be performed in one or a multiple of passes. When multiple passes are used, the cold rolling may be done in different directions to further enhance reductions in strength anisotropy for these types of alloys. Table X and Figure 8 summarize the results of inventive practive (D), (E) or (F) on the highest and the lowest (TYS) value and compares it with the conventional practice. The relative closeness of (TYS) by inventive practice suggests commercial exploitation of the wrought Al-Li alloys in high strength applications.
Abstract:
An aluminum-based alloy useful in aircraft and aerospace structures which has low density, high strength and high fracture toughness consists essentially of the following formula: CuaLibMgcAgdZreAlbal, wherein a, b, c, d, e and bal indicate the amount in wt.% of alloying components, and wherein 2.8
Abstract:
A channel bag (20) and a one piece spout sock (12) and channel bag assembly for casting metal ingots. The channel bag (20) includes diverter strips (10) along upper portions of the sides and a diverter panel (11) in the bottom of the channel bag positioned to be beneath a downspout (15) during a casting process. The diverter strips (10) and panel (11) deflect poured molten metal and reduce turbulence during the casting process thereby reducing the formation of oxides and other impurities. In the one piece spout sock (12) and channel bag assembly (20), the spout sock (12) is utilized to receive and properly align a downspout (15). An ingot casting procedure utilizing the apparatus of the present invention reduces or eliminates the use of skimmers and ingot scalping.
Abstract:
An aluminum based alloy useful in aircraft and aerospace structures which has low density, high strength and high fracture toughness consists essentially of the following formula: CuaLibMgcAgdZreAlba1, wherein a, b, c, d, e and ba1 indicate the amount in wt. % of alloying components, and wherein 2.4
Abstract:
A method of improving the corrosion properties of an aluminum alloy product containing solid solution alloying elements depends on a rapid quench step (see process steps in the figure). This method of improvement includes the step of rapidly quenching the alloy product after it has been heated or hot deformed so as to maintain the alloying elements in solid solution to avoid microsegregation of solid solution alloying elements and minimize preferential sites for corrosion onset.
Abstract:
A bridge structure includes an essentially isotropic bridge deck formed of modular deck panels (2110, 2112) spliced to each other on site. The deck panels (2110, 2112) are preferably shop fabricated by longitudinal welding of adjacently placed multi-void elongate aluminum structural elements (102). Longitudinally adjacent elongate elements are spliced by providing internally disposed shear elements (518, 520) prior to longitudinal welding of adjacent spliced elongate elements, with the end joints between spliced elongate elements being arrayed in a staggered manner.
Abstract:
A method and apparatus (10) for continuously cladding cast material (11) includes simultaneously roll bonding a cladding liner stock (25) to a material (11) exiting a continuous casting apparatus (1). At the same time the liner stock (25) is roll bonded to the cast material (11), the clad cast material (37) is hot worked to form a clad product (35). A spray shield (29) is positioned near the interface (31) where the liner stock (25) contacts the as cast material (11) to prevent any impurities such as rolling lubricants from contaminating the bonding interface (31) between the liner stock (25) and the surface of the as cast material (33). The sole drawing is a schematic representation of the inventive apparatus (10) for simultaneously cladding and hot working an as cast material.
Abstract:
Free-machining aluminum alloys are disclosed containing effective amounts of tin and indium. The tin and indium additions are especially adapted for use as free-machining constituents in aluminum alloys, such as AA2000 and AA6000 series aluminum alloys. The additions can be used in place of bismuth and lead in currently available free machining alloys. In alloys containing bismuth and tin, the indium can be used to replace the bismuth. A method of producing a free-machining aluminum alloy product also is described.