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Metallurgical characterization of the fracture of several high strength aluminum alloysThe fracture behavior for structural aluminum alloys (2024, 6061, 7075, and 7178) was examined in selected heat treatments. The investigation included tensile, shear, and precracked notch-bend specimens fractured at ambient temperature under monotonic loading. Specimens were obtained from thin sheets and thick plates and were tested in longitudinal and transverse orientations at different strain rates. Microstructures of alloys were examined using the optical microscope and the scanning electron microscope with associated energy dispersive X ray chemical analysis. Several different types of second phase particles, some not reported by other investigators, were identified in the alloys. Fracture morphology was related to microstructural variables, test variables, and type of commercial product. Specimen orientation examined in the present investigation had little effect on fracture morphology. Test strain rate changes resulted in some change in shear fracture morphology, but not in fracture morphology of tensile specimens.
Document ID
19840003162
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Bhandarkar, M. D. (NASA Langley Research Center Hampton, VA, United States)
Lisagor, W. B. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
December 1, 1977
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NAS 1.60:1086
L-11255
NASA-TP-1086
Accession Number
84N11230
Funding Number(s)
PROJECT: RTOP 505-01-34-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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