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测定了含不同浓度有害杂质及Ｃｅ的８０９０合金薄板不同方向力学性能及断裂性能．结果表明：Ｆｅ，Ｓｉ使各方向的断裂韧性下降，并使４５°方向上的裂纹启裂阻力下降，Ｎａ，Ｋ除对Ｔ－Ｌ方向的启裂阻力不造成明显损害外，能够损害各方向的断裂性能．在合金中添加０．０９％Ｃｅ即可显示有益的合金化作用；如果添加０．２８％Ｃｅ，可明显改善含一定量Ｆｅ，Ｓｉ的合金薄板各方向的断裂性能，其主要原因在于Ｃｅ可通过使再结晶组织均匀，细化晶粒，减少晶界析出相及改善断裂过程等机制抑制杂质对断裂性能的危害．
The mechanical properties and fracture properties of 8090 alloy sheet with different concentrations of harmful impurities and Ce were measured. The results show that the fracture toughness of Fe and Si decrease in all directions, and the crack initiation resistance in 45 ° direction decreases. Na and K can not damage the cracking resistance in T-L direction obviously, Fracture properties. Adding 0.09% Ce into the alloy can show beneficial alloying effect. If 0.28% Ce is added, the fracture properties of the alloy sheet containing a certain amount of Fe and Si can be obviously improved. The main reason is that Ce By making the recrystallization structure uniform, grain refinement, grain boundary precipitation and the improvement of the fracture mechanism and other mechanisms to inhibit impurities on the fracture performance hazards.