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Constant amplitude and post-overload fatigue crack growth behavior in PM aluminum alloy AA 8009A recently developed, rapidly solidified, powder metallurgy, dispersion strengthened aluminum alloy, AA 8009, was fatigue tested at room temperature in lab air. Constant amplitude/constant delta kappa and single spike overload conditions were examined. High fatigue crack growth rates and low crack closure levels compared to typical ingot metallurgy aluminum alloys were observed. It was proposed that minimal crack roughness, crack path delection, and limited slip reversibility, resulting from ultra-fine microstructure, were responsible for the relatively poor da/dN-delta kappa performance of AA 8009 as compared to that of typical IM aluminum alloys.
Document ID
19920064477
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Reynolds, A. P.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Fatigue and Fracture of Engineering Materials and Structures
Volume: 15
Issue: 6 Ju
ISSN: 8756-758X
Subject Category
Structural Mechanics
Accession Number
92A47101
Funding Number(s)
PROJECT: RTOP 505-63-50-04
Distribution Limits
Public
Copyright
Other

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