Environmental fatigue in aluminum-lithium alloys
Technical Report
·
OSTI ID:6958508
Aluminum-lithium alloys exhibit similar environmental fatigue crack growth characteristics compared to conventional 2000 series alloys and are more resistant to environmental fatigue compared to 7000 series alloys. The superior fatigue crack growth behavior of Al-Li alloys 2090, 2091, 8090, and 8091 is due to crack closure caused by tortuous crack path morphology and crack surface corrosion products. At high R and reduced closure, chemical environment effects are pronounced resulting in accelerated near threshold da/dN. The beneficial effects of crack closure are minimized for small cracks resulting in rapid growth rates. Limited data suggest that the 'chemically small crack' effect, observed in other alloy system, is not pronounced in Al-Li alloys. Modeling of environmental fatigue in Al-Li-Cu alloys related accelerated fatigue crack growth in moist air and salt water to hydrogen embrittlement.
- Research Organization:
- National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
- OSTI ID:
- 6958508
- Report Number(s):
- N-92-32423; NASA-TM--107640; NAS--1.15:107640; CNN: RTOP 538-02-10-01
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
COPPER ALLOYS
CORROSION
CRACK PROPAGATION
EMBRITTLEMENT
FATIGUE
FLUIDS
GASES
HYDROGEN EMBRITTLEMENT
LITHIUM ALLOYS
MECHANICAL PROPERTIES
MORPHOLOGY
SALINITY
VAPORS
WATER VAPOR
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
COPPER ALLOYS
CORROSION
CRACK PROPAGATION
EMBRITTLEMENT
FATIGUE
FLUIDS
GASES
HYDROGEN EMBRITTLEMENT
LITHIUM ALLOYS
MECHANICAL PROPERTIES
MORPHOLOGY
SALINITY
VAPORS
WATER VAPOR