Al and Mg Alloys for Aerospace Applications Using Rapid Solidification and Powder Metallurgy Processing.
Abstract
The first section of the progress report is concerned with the development of rapidly solidified Al-8Fe-2Mo-SI alloys for elevated temperature applications. Rapidly solidified Al-8FE-2Mo alloys containing silicon in the range of 0 to 1wt pct were produced by melt spinning. In the second annual report, preliminary results of the effect of Si on the formation of the Sone A microstructure and on subsequent changes of this structure during heat-treatment were described. It was shown that addition of Si has a dramatic effect on the trasnformation behavior and microstructure of heat-treated ribbons. In contrast to the thermally unstable, multiphase precipitate distribution in the ternary Al-8FE-2Mo alloy, quarternary Si-containing alloys showed a uniform dispersion of fine cuboidal/polygonal precipitates, which displayed a remarkable resistance to coarsening. A typical TEM micrograph portraying this effect is shown in FIg 1 for a Al-8Fe-2Mo0-0.5Si alloy heat treated at 450 C for 50 hrs. To identify the nature of the precipitates, x-ray and electron diffraction were used, and these results are reported here. Keywords: Molybedenum alloys; Silicon aluminum alloys; Iron alloys.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1987
- Accession Number
- ADA179547
Entities
People
- Fraser
Organizations
- University of Illinois Urbana–Champaign