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Characterization of Al-Cu-Li Alloy 2090 Near Net Shape ExtrusionAluminum-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.
Document ID
19980197316
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Birt, M. J. (Analytical Services and Materials, Inc. Hampton, VA United States)
Domack, M. S. (NASA Langley Research Center Hampton, VA United States)
Hafley, R. A. (Analytical Services and Materials, Inc. Hampton, VA United States)
Pollock, W. D. (Analytical Services and Materials, Inc. Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1998
Subject Category
Metallic Materials
Report/Patent Number
NAS 1.15:207668
NASA/TM-1998-207668
L-17611
Funding Number(s)
PROJECT: RTOP 232-01-04-07
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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