Synthesis of Bulk Nanostructured Al Alloys with Ultra-High Strength and Wear Resistance for Army Applications
Abstract
An Al alloy with a chemical composition of Al85Ni10La5 (at.%) has been selected for exploratory development of new bulk nanostructured Al alloys aiming at ultra-high strength as well as good wear performance for future Army systems. The selected alloy has a high potential to be a candidate due to its inherent good glass forming ability, thermal stability and mechanical properties. Amorphous powders of the Al85Ni10La5 alloy were produced using a gas atomization technique. These powders can be used for synthesizing ultra-high strength bulk nanostructured Al alloy via crystallization from the amorphous phase. In addition, Al85Ni10La5 ribbon was also fabricated using a melt spinning technique. The amorphous alloy of Al85Ni10La5 (at.%) was successfully fabricated in terms of melt-spun ribbons and, particularly, gas-atomized powders (<25 micrometers). The devitrification behavior and kinetics were investigated using SEM, XRD, DSC and TEM etc. Useful information has been obtained for the following consolidation procedure to produce bulk nanostructured Al alloy. It was shown that the Al85Ni10La5 amorphous powders have high thermal stability and a processing at 250 degrees C could result in a grain size of 20^30 nm. Efforts on the investigation of the stabilization mechanisms in bulk nanostructured Al materials were also carried out.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 03, 2003
- Accession Number
- ADA419177
Entities
People
- E. J. Lavernia
- F. A. Mohamed
Organizations
- University of California, Irvine