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Hydrogen effects on the age hardening behavior of 2024 aluminumIt has been found that the fatigue crack growth rate in aluminum alloys increases significantly in the presence of moisture. This phenomenon along with a moisture effect observed in another context has been attributed to 'embrittlement' of the aluminum by absorbed hydrogen generated by the reaction of moisture with freshly exposed aluminum. A description is given of a number of age hardening experiments involving 2024 aluminum. These experiments show that a mechanism related to the segregation of absorbed hydrogen to the coherent theta-double-prime interfaces may account for the observed reduction in fatigue life. It is pointed out that this segregation promotes a loss of coherency in the hydrogen rich region at a fatigue crack tip. Subsequently, the loss of coherency causes local softening and reduces fatigue life.
Document ID
19860060972
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wagner, J. A.
(NASA Langley Research Center Hampton, VA, United States)
Louthan, M. R., Jr.
(Virginia Polytechnic Institute, Blacksburg, United States)
Sisson, R. D., Jr.
(Worcester Polytechnic Institute, MA, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1986
Publication Information
Publication: Scripta Metallurgica
Volume: 20
ISSN: 0036-9748
Subject Category
Metallic Materials
Accession Number
86A45710
Distribution Limits
Public
Copyright
Other

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