Investigation and Synthesis of High Temperature and Increased Stiffness RSP Aluminum Alloys.
Abstract
The objective of this research is to investigate two promising systems as the basis for high temperature aluminum alloys useful to 425 C (800 F). The first is a metal matrix composite consisting of an aluminum-magnesium alloy matrix reinforced by spinel (magnesium aluminate) particulate. The second system is tri-aluminum (zirconium, vanagium) dispersed in aluminum matrix. Here the lattice parameter matches that of the matrix. Research on dilute alloys has shown a low coarsening rate for this intermetallic at 425 C. Study of more concentrated alloys with the necessary volume percent of dispersid for high temperature creep and fatigue resistance is underway. A procedure for preparing specimens of the aluminum alloy matrix-spinel composite has been worked out and specimens are being prepared. In the procedure rapidly solidified alloy powder and oxide are mechanically alloyed, cold pressed, hot pressed, pressure forged and annealed. Extrusions containing 5 volume percent tri-aluminum (0.75 vanadium, 0.25 zirconium) were prepared for this research by Lockhead-Palo Alto from rapidly solidified foil. The measured creep rate at 425 C is much lower than in the current aluminum-iron-cerium alloy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1986
- Accession Number
- ADA174598
Entities
People
- Julia R. Weertman
- Morris E. Fine
Organizations
- Northwestern University