EFFECTS OF IMPURITIES AND Ce ON FRACTURE BEHAVIOUR OF 8090 ALLOY SHEETS IN DIFFERENT ORIENTATIONS

Acta Metall Sin

1995, Vol. 31

Issue (1): 40-46 DOI:

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EFFECTS OF IMPURITIES AND Ce ON FRACTURE BEHAVIOUR OF 8090 ALLOY SHEETS IN DIFFERENT ORIENTATIONS

MENG Liang;GENG Dongsheng; ZHENG Xiulin(Northwestern Polytechnical University; Xi'an 710072)(Manuscript received 94-05-09)

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MENG Liang;GENG Dongsheng; ZHENG Xiulin(Northwestern Polytechnical University; Xi'an 710072)(Manuscript received 94-05-09). EFFECTS OF IMPURITIES AND Ce ON FRACTURE BEHAVIOUR OF 8090 ALLOY SHEETS IN DIFFERENT ORIENTATIONS. Acta Metall Sin, 1995, 31(1): 40-46.

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Abstract 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)

Key words: Al-Li alloy impurity Ce fracture behaviour

Received: 18 January 1995

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