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The fatigue response of the aluminium-lithium alloy, 8090The fatigue response of an Al-Li-Cu-Mg-Zr (8090) alloy has been studied at room temperature. The initiation and growth of small and long cracks has been examined at R = 0.1 and at a frequency of 100 Hz. Initiation was observed to occur dominantly at sub-grain boundaries. The growth of the small cracks was crystallographic in character and exhibited little evidence of retardation or arrest at the grain boundaries. The long crack data showed the alloy to have a high resistance to fatigue crack growth with underaging providing the optimum heat treatment for fatigue crack growth resistance. In general, this can be attributed to high levels of crack closure which resulted from the presence of extensive microstructurally related asperities.
Document ID
19910059234
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Birt, M. J.
(NASA Langley Research Center Hampton, VA, United States)
Beevers, C. J.
(Birmingham, University United Kingdom)
Date Acquired
August 15, 2013
Publication Date
January 1, 1989
Subject Category
Metallic Materials
Meeting Information
Meeting: International Aluminum-Lithium Conference
Location: Williamsburg, VA
Country: United States
Start Date: March 27, 1989
End Date: March 31, 1989
Accession Number
91A43857
Distribution Limits
Public
Copyright
Other

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