An up to date review of the stress corrosion cracking performance of wrought high strength aluminum alloys is presented. Special emphasis is placed on factors of microstructure and its directionality and the effect of ancillary alloying elements, and environmental factors.
Examples of typical service problems encountered with stress corrosion cracking of high strength aluminum alloys are described along with means of combating them, such as peening, coatings, or the use of special stress corrosion resistant alloys.
In the development of high-strength, weldable aluminum alloys it is necessary to determine the resistance to stress corrosion cracking of experimental combinations of parent plate and filler alloys. Several types of specimen and methods of loading have been studied to evaluate techniques suitable for rapid screening of alloys and for demonstrating the serviceability of alloys. Stress corrosion tests have been conducted in 3.5 per cent sodium chloride by alternate immersion and in seacoast and industrial atmospheres, comparing beam and tension specimens. The beam specimens were loaded by constant deformation, and tension specimens were loaded both by constant deformation and by constant load. Welded specimens designed to investigate the effect of residual welding stresses upon both butt welds and fillet welds also are included.
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