Characterization of High Cycle Fatigue Behavior of a New Generation Aluminum Lithium Alloy
Abstract
The high cycle fatigue life characteristics of an Al-Li alloy were studied as a function of microstructure. While for the parent microstructure fatigue life decreased as grain size increased, no such effect was noted at high stresses. This decrease in fatigue life was correlated with lower crack initiation life due to small crack effect. under multiaxial stress conditions, the alloy exhibited intergranular cracking. The cross-linking of intergranular cracks (in the T8 condition) caused a further deterioration in fatigue life. Additionally, planar slip movements (in the T3 condition) in stage I crack propagation were observed. Slip planarity depended on both the sample texture and the nature of the precipitates. Fractographic and textural evidence is presented.
Recommended Citation
R. S. Mishra et al., "Characterization of High Cycle Fatigue Behavior of a New Generation Aluminum Lithium Alloy," Acta Materialia, Elsevier, Sep 2011.
The definitive version is available at https://doi.org/10.1016/j.actamat.2011.06.003
Department(s)
Materials Science and Engineering
Sponsor(s)
Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
Keywords and Phrases
Fracture; Aluminum alloys; Fatigue
International Standard Serial Number (ISSN)
1359-6454
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2011 Elsevier, All rights reserved.
Publication Date
01 Sep 2011
