Characterization of High Cycle Fatigue Behavior of a New Generation Aluminum Lithium Alloy (Preprint)
Abstract
The high cycle fatigue life characteristics of an Al-Li alloy was studied as a function of microstructure. For the parent microstructure, fatigue life decreased with an increase in the grain size. No such effect was however noted at high stresses. This decrease in fatigue life was correlated with the lower crack initiation life arising due to small crack effect. Under multiaxial stress conditions, the alloy exhibited intergranular type of cracking. The cross-linking of intergranular cracks (in T8 condition) caused a further deterioration in fatigue life. Additionally, planar type of slip movements (in T3 condition) in stage-I crack propagation was observed. The slip planarity depended on both the sample texture and the nature of precipitates. Fractographic and textural evidences for this are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2011
- Accession Number
- ADA550829
Entities
People
- J. A. Baumann
- P. S. De
- R. S. Mishra
Organizations
- Missouri University of Science and Technology