Abstract
The primary requirement of aircraft design is safety. The fatigue fracture is difficult to detect and prevent, which is a major safety hazard during aircraft service. In this paper, the influence of solution heat treatment on the microstructure and resistant of fatigue crack growth of 7050 alloy is investigated. For one-stage solution heat treatment, with the solution temperature increases, the area fraction of the coarse constituent phase decreases and the recrystallization fraction increase, and conresponsively the strength and fracture toughness increase and the fatigue crack growth rates decrease. Under the two-stage solution heat treatment, the alloy has the best fatigue crack growth resistance compare with the one-stage solution heat treatments. The effect of solution heat treatment on the properties can be understood on the basis of the combined influence of the constituent phase and the recrystallized fraction.
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