Role of Microstructure on Fatigue Durability of Aluminum Aircraft Alloys
Abstract
In some 7050 thick plate, the constituent particle population controls the fatigue crack initiation behavior. Constituent particle distributions were quantified on four microstructural variants of 7050 using automated image analysis. Plate produced with very low microporosity was found to have nearly the same particle distributions as the control plate (standard processing and composition). Plate 1.0 inch thick had the same area fraction of particles measured (approx. 1%), but the large amount of deformation reduced the mean and standard deviation of the particle size. A low mean and standard deviation of the size distribution was achieved in plate with low particle volume fraction. Since the largest values of the particle size distribution affect the fatigue crack initiation behavior, reducing the upper tail of the size distribution is particularly important.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 15, 1993
- Accession Number
- ADA272117
Entities
People
- A. J. Hinkle
- J. R. Brockenbrough
- Jing Liu
- P. E. Magnusen
- R. J. Bucci
Organizations
- Alcoa