Abstract
The interrelationships between precipitate characteristics and mechanical properties of Al-Li-Cu alloy AF/C-458 were quantified. The microstructure, precipitation response, and fatigue crack growth (FCG) rates in the Al-Li-Cu alloy AF/C-458 were studied following single and duplex aging treatments for varying aging times on specimens that were given a 6% stretch after solution heat treatment. The aging response was studied using hardness and compression yield strength measurements. Quantitative transmission electron microscopy methods were used to characterize average size, volume fraction, number density, and interparticle spacing of strengthening precipitates [i.e., δ’ (Al3Li) and T1 (Al2CuLi)]. Strength and FCG rates for select heat treatments were obtained and were related to the precipitate microstructure and yield strength data.
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