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 effects of the impurities and Ce on the fracture behaviour of 8090 alloy sheets were experimentally investigated.Test results show that Fe and Si in 8090 alloy sheets decrease the plane stress fracture toughness in all orientations tested and the crack initiation and propagation resistance in 45°orientation. Na and K decrease the fracture properties in all orientations tested except the crack initiation resistance in T-L orientation.Adding 0.09% Ce into 8090 alloy sheets shows the beneficial effect on the plane stress fracture toughness.The fracture properties of 8090 alloy sheets containing more Fe and Si could be improved by adding 0.28% Ce. The reason behind it may be attributed to that Ce dissolved in a matrix could make the recrystallization microstructure of 8090 alloy sheets more uniform and finer,and reduce the compound particles precipitated along the grain boundaries, which is benefitcal to suppress the tendency of brittle fracture.Correspondent:(MENG Liang,associate professor,Department of Materials Science and Engineering.Northwestern Polytechnical University,Hi'an,710072)
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