Synthesis and properties of elevated-temperature p/m aluminum alloys. Annual technical report, 1 October 1983-30 September 1984
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 were 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 Al/sub 6/Fe. In these two alloys, aging 240 hours at 425 C gives particles close to Al/sub 13/Fe/sub 4/ in composition. In A1-Fe-Ce alloys aged at 425 C, two kinds of particles are present with composition close to Al/sub 13/Fe/sub 4/ and Al/sub 10/Fe/sub 2/Ce. Some Al/sub 6/Fe 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 Al/sub 3/(V0.875Zr0.125) over the unalloyed Al3Zr phase was also found in the respective metastable cubic phases.
- Research Organization:
- Northwestern Univ., Evanston, IL (USA). Dept. of Materials Science and Engineering
- OSTI ID:
- 5626756
- Report Number(s):
- AD-A-151031/2/XAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
EDS study of the dispersed phase in the Al-Fe-Ce RSP P/M alloy
Degradation of RSP/PM Al-8Fe-4Ce during creep
Related Subjects
ALUMINIUM BASE ALLOYS
PHASE STUDIES
CERIUM ALLOYS
IRON ALLOYS
MOLYBDENUM ALLOYS
VANADIUM ALLOYS
ZIRCONIUM ALLOYS
CREEP
DEFORMATION
DISPERSIONS
HIGH TEMPERATURE
LOW TEMPERATURE
MICROSTRUCTURE
PARTICLES
POWDER METALLURGY
SPECTROSCOPY
ALLOYS
ALUMINIUM ALLOYS
CRYSTAL STRUCTURE
MECHANICAL PROPERTIES
METALLURGY
RARE EARTH ALLOYS
360101* - Metals & Alloys- Preparation & Fabrication