Excellent Machinability. Aluminum sheets possess excellent machinability. However, the machinability characteristics can vary greatly among different types of aluminum alloys and in the various states they exhibit after production, necessitating the use of specialized machinery or technology during the machining process.
Chemical etching is a conventional process used for reducing the thickness of metals, either in alkaline or acidic solutions. This method allows for the uniform removal of metal from complex large surfaces and is highly cost-effective. The process is widely applied to etch pre-fabricated aerospace components, achieving a high strength-to-weight ratio. Entirely reinforced aluminum wing and fuselage sections require chemical etching to produce good cross-sections and thin skin thicknesses. Aluminum trusses, girders, floor beams, and frames in construction projects are also commonly prepared using this method.
Formability is one of the more important characteristics of many aluminum sheets. Specific tensile strength, yield strength, ductility, and corresponding work-hardening rates govern the variation in the amount of deformation allowed. The formability ratings of the deformable aluminum alloys commercially available vary with the forming process, and these ratings can only serve as a rough guide in qualitative comparisons of metalworking properties; they cannot be used as quantitative limits for formability. The choice of condition depends on the extent and nature of the forming operation. For deep drawing, rolling forming, or small-radius bending, for instance.
Ductility. Aluminum sheets can be forged into complex shapes and a wide variety of forgings, offering a broad range of final part forging design standards (based on the predetermined application). Deformed aluminum alloy forgings, particularly those produced by closed-die forging, can typically achieve better surface finishes compared to hot-forged carbon steel and/or alloy steel. For aluminum sheets of a given forging shape, the forging temperature can vary significantly, primarily depending on the chemical composition of the alloy being forged, the forging process method used, the forging strain rate, the type of forging processed, lubrication conditions, and the temperatures of the forging and die.
