Synthesis and Properties of Elevated Temperature P/M Aluminum Alloys.
Abstract
The dispersed phases in the Al-8Fe, Al-10Fe-1.5Mo-1V, Al-8.8Fe-3.7Ce and Al-8.9Fe-6.9Ce RSP P/M alloys have been examined for composition and coarsening rate. Additionally, effects of prior heat treatment and deformation on particle coarsening have been studied. Energy dispersive spectroscopy on extracted particles from the Al-8Fe and Al-10Fe-1.5Mo-1V alloys in the as-received condition as well as after aging at 316 C indicated that the particles have compositions close to Al6Fe. In these two alloys, aging 240 hours at 425 C gives particles close to Al13Fe4 in composition. In A1-Fe-Ce alloys aged at 425 C, two kinds of particles are present with composition close to Al13Fe4 and Al10Fe2Ce. Some Al6Fe is seen in these alloys in the as-received condition and also after aging at 316 C. Overall coarsening rates of the dispersed phases indicate that at 375 and 425 C the Al-Fe-Mo-V alloy coarsens more slowly than the other three alloys. Creep deformation of the Al-8.8Fe-3.7Ce alloy enhances particle coarsening rates while no such effect is noted after fatigue deformation. A high temperature age preceding a low temperature age gives a stable microstructure at the lower temperature. The improved lattice matching previously observed in the equilibrium, tetragonal Al3(V0.875Zr0.125) over the unalloyed Al3Zr phase was also found in the respective metastable cubic phases. Originator-supplied keywords include: Ostwald ripening (coarsening); aluminum-iron cerium alloy; aluminum-zirconium-vanadium alloy; iron-molybdenum-vanadium alloy, and aluminum-molybdenum-vanadium alloy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1984
- Accession Number
- ADA151031
Entities
People
- J. R. Weertman
- M. E. Fine
Organizations
- Northwestern University