Alternative aluminum alloys are under consideration for drop-in replacement and refurbishment of corrosion and stress corrosion cracking prone AA7075-T6 (UNS A97075) components on aging military aircraft. An assessment of new materials for refurbishment and replacement of older generation, aging components is necessary for a viable life extension program. A quantitative database of stress corrosion cracking (SCC) properties of old generation materials compared to currently available materials is needed as a guideline/justification for part replacement. This effort evaluates AA7150-T7751 (UNS A97150) and AA7040-T7651 (UNS A97040), both which meet mechanical property requirements and are thought to be superior to AA7075-T6 in terms of corrosion performance. Specifically, stress corrosion crack growth rates for these plate alloys were documented and found to be similar in various bulk aqueous chloride environments and to represent a significant improvement over measured rates for AA7075-T651.

Subject
Test methods, Crack growth, Stress intensity, Corrosion rate, Sodium chloride, Bulk solution, Incubation, Corrosion growth, Immersion, Alloys, Chlorides, Stress corrosion cracking, Chloride stress corrosion cracking
Keywords:
aluminum, crack growth rate, cracking, environmentally assisted corrosion, sodium chloride, stress corrosion cracking
NACE International
2005
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