Fatigue crack propagation in Al-Li 8090 alloy at room (300 K) and cryogenic (77 K) temperatures
- Pohang Univ. of Science and Technology (Korea, Republic of). Center for Advanced Aerospace Materials
It has been reported that Al-Li alloys display enhanced ductility and fracture toughness at lower temperatures than room temperature. Therefore, Al-Li alloys have been considered as an attractive material for cryogenic fuel tanks as well as for aircraft structure parts. While many investigations have been carried out on the tensile and fracture behavior of Al-Li alloys at cryogenic temperatures, cryogenic fatigue properties have been investigated only recently. Previous study indicates that the fatigue strength increases as the test temperature decreases. The improved fatigue strength at cryogenic temperatures has been attributed to the increased tendency for more homogeneous plastic deformation and delamination toughening. The objectives of the present work are to examine the fatigue crack propagation behavior of an Al-Li 8090 alloy at room (298 K) and cryogenic (77 K) temperatures and also to study the microstructural effect on the cryogenic fatigue properties.
- OSTI ID:
- 186792
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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