Investigation and Synthesis of High Temperature and Increased Stiffness RSP Aluminum Alloys
Abstract
The objective of this research was 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 Al3(ZrX), where X is vanadium or titanium dispersed in aluminum matrix. Here the lattice parameter of the Al3(ZrX) intermetallic particles nearly matches that of the matrix. Research on dilute alloys has shown a low coarsening rate for these intermetallics at 425 C. A study of aluminum alloys with a higher concentration of zirconium and vanadium was completed. The creep resistance at 410 C of the spinel composite was much better than that of the alumina composite. Extrusions containing 5 vol.% A13(V.75Zr.25) were prepared. The measured creep rate at 425 C is much lower than that of the current aluminum-iron-cerium alloys. An aluminum-vanadium intermetallic compound, however, forms at grain boundaries leading to a precipitate free zone which grows slowly at 425 C. Dilute alloys containing 1 vol.% A13(ZrTi) were then prepared and these show more promise than the aluminum-zirconium-vanadium alloys.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1988
- Accession Number
- ADA204162
Entities
People
- Julia R. Weertman
- Morris E. Fine
Organizations
- Northwestern University