The influence of grain structure and Ce on the strength ductility combination for aluminum lithium alloy was investigated. The strength ductility combination of pancake shape unrecrystallized grains is superior to that of recrystallized grains. A significant improvement in strength ductility combination can be achieved by adding Ce to alloy 2090. According to the research results about fracture and properties of monotonic tension for Al Li alloys 2090 and 2090+Ce, the relationship among grain structure, strength differences between grain within and grain boundary, stress localization degree at grain boundary and extrinsic strengthening effect was researched. The method and mechanisms of optimizing strength ductility were discussed, including grain structure, subgrain, T 1 phase, rare earth element Ce and aging procedure.
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