Abstract
Creep crack growth behavior of two Al-Li-Cu-Mg-Zr alloys with and without the addition of Ge was determined under static load at 150 °C and the results were analyzed using the linear elastic and elastic-plastic fracture mechanics methods. The alloys were produced through conventional ingot metallurgy processing and extruded into a plate form. Texture is more pronounced in the alloy that does not contain Ge. Because of the texture, crack growth rates in the two alloys differ significantly for the L-T and T-L orientations. The growth occurs by the nucleation of microcracks ahead of the main crack which grow and coalesce with the main crack. While this leads to rapid crack growth in the T-L orientation, it causes crack tip bifurcation and even complete crack arrest in the L-T orientation.
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