A Fundamental Study of Fatigue in Powder Metallurgy Aluminum Alloys
Abstract
Fatigue response in high strength powder metallurgy aluminum alloys is being evaluated; the primary objective is to establish and understand processing-microstructure-fatigue integrity relationships. The program includes stress-controlled low and high cycle response and a determination of crack propagation rates in both air and saline environments. In scope, there are two concurrent phases of research; in one, the combined effects of powder processing mode and cobalt level (0, 0.4, 0.8%) on fatigue are examined while in the other, cobalt level is kept constant (0.4%) but the powder alloy is processed to give differing but known/controlled levels of deformation (material flow) by forging. S-N curves for axial fatigue (R equal to 0.1) in air reveal a strong influence of processing mode on life in alloys containing cobalt. Anisotropy in fatigue response is observed for each condition of cobalt level and processing mode examined; the degree of anisotropy is a function of processing mode if cobalt is present.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1978
- Accession Number
- ADA069021
Entities
People
- Alan Lawłey
- M. J. Koczak
Organizations
- Drexel University