A laboratory-scale alloy development program was undertaken. Property goals established for the program included 4-5 % lower density than conventional alloys and 7 % higher modulus. Strength, corrosion resistance, and fracture toughness were to be equal to or better than 2124-T851. Intended use is for parts machined from up to 150 mm plate, requiring good damage tolerance properties in all orientations. Five Al-Cu-Li-Mg-Zr candidate compositions having a wide range of Cu:Mg ratios were selected. These were successfully cast as 160 kg DC ingots. Ingots were homogenized and hot rolled to 15 mm plate. Two of the alloys were also rolled to 32 mm plate. Heat treating and aging practices were developed for both cold-water and hot-water (simulating thick plate), quenched material. Each alloy was tested in a peak aged condition. Only the Mg-free composition consistently demonstrated high resistance to stress corrosion. Four of the alloys met strength and toughness goals in all orientations.
Aluminium-lithium aloy development. For parts made form thick plate
Aluminiumlithiumlegierung für Teile aus dicken Platten
1991
9 Seiten, 11 Bilder, 4 Tabellen, 8 Quellen
Conference paper
English
ALUMINIUM ALLOY, MECHANICAL PARTS MADE THEREFROM, AND USE THEREOF
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