Abstract
Measurements of the fatigue crack tip opening displacement and strain for the aluminum alloys 7075 and 7091 have been used together with a crack tip model to infer the relevant microstructural parameters affecting fatigue crack growth rate. The two alloys studied are metallurgically quite different: alloy 7075 is an ingot metallurgy material with large pancake grains, while alloy 7091 is prepared by powder metallurgy techniques, resulting in small tubular-shaped grains. However, careful microstructural measurements showed that the dispersoid mean free path for the two alloys was nearly the same and of the same magnitude as the relevant microstructural parameter derived using the model. It is concluded that dispersoids in aluminum alloys play a larger role in fatigue crack growth rate than is commonly recognized. The effects of environment are also considered in this paper.
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