Fatigue Characteristics and Microstructural Analysis of Thermomechanically-Processed, High-Magnesium Aluminum-Magnesium Alloy.
Abstract
Particular emphasis was placed on study of the microstructural changes which occur during cyclic loading. The study was conducted utilizing a simple binary alloy, A1-10.2 wt pct Mg, and a ternary A1-8.14 wt pct Mg-0.40 wt pct Cu alloy. Both alloys were given similar processing; in particular, both alloys were examined for two rates of quenching to determine the effect of cooling rate from the homogenization temperature on the tensile properties and fatigue characteristics of the alloys. The primary strengthening mechanism in the high-magnesium aluminum-magnesium alloys was determined to be the dislocation substructure developed during warm rolling. In fatigue, the A1-10.2 wt pct Mg alloy appears to exhibit an endurance limit, with a fatigue strength to yield strength ratio in excess of 0.6 in the oil quenched condition. Microstructural refinement achieved through more rapid quenching or through alloying additions was found to degrade the fatigue response although providing improved strength and ductility. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1981
- Accession Number
- ADA104589
Entities
People
- Charles A. Cadwell Jr
Organizations
- Naval Postgraduate School