Abstract
The high-strength aluminum alloy Al–5.5Zn–2.5Mg–1.5Cu (AA 7075) is extensively used in aerospace applications. An injector body of a gas generator for a turbine rotor in a liquid propulsion system was fabricated out of AA 7075 forgings in the T7352 condition, and, subsequent to a qualification hot test, one of the injector discs showed the presence of cracks on the top face of the body. Detailed metallurgical investigation indicated that the failure was caused by stress-corrosion cracking (SCC).
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