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Characterization of al-cu-li alloy 2090 near net shape extrusion
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Birt, M. J. Hafley, R. A. Pollock, W. D. Domack, M. S. |
| Copyright Year | 1998 |
| Description | Aluminum-lithium (Al-Li) alloys near net shape extrusions are being evaluated for potential application in launch vehicle structures. The objective of this study was to determine tensile and fracture properties, corrosion resistance, and weldability of integrally stiffened panels of Al-Cu-Li alloy 2090 in the T8 temper. The microstructure was pre-dominantly unrecrystallized. Texture analyses revealed the presence of fiber components in the stiffeners and a combination of fiber and rolling components in the skin. Variations in grain morphology and texture through the extruded cross section were correlated with the tensile, fracture, and corrosion behavior. Tensile strengths at room and cryogenic temperatures of the 2090 extrusions were similar to other 2090 product forms and were higher than 2219-T87, the primary structural material in the Space Shuttle external tank; however, ductilities were lower. The fracture resistance of the 2090 extrusion was lower than 2219-T87 plate at room temperature. At cryogenic temperatures, tensile ductility and fracture behavior of the 2090 extrusion were similar to other 2090 product forms but were lower than 2219-T87 plate. The exfoliation and stress corrosion resistance of the 2090 extrusion compared favorably with the characteristics of other 2090 product forms. The weldability and weldment properties of the extrusions were similar to 2090 and 2219 plates. |
| File Size | 5848626 |
| Page Count | 76 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19980197316 |
| Archival Resource Key | ark:/13960/t9n34sk0v |
| Language | English |
| Publisher Date | 1998-05-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Fracture Mechanics Ductility Space Shuttles Aluminum-lithium Alloys Aluminum Alloys Lithium Alloys Cryogenic Temperature Textures Corrosion Resistance Welded Joints Stress Corrosion External Tanks Launch Vehicles Copper Alloys Morphology Weldability Fracture Strength Microstructure Tensile Properties Room Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
