High Strength Aluminum Alloys Prepared by Improved Solidification Techniques.
Final technical rept., 1 Nov 71-31 Oct 72,
MASSACHUSETTS INST OF TECH CAMBRIDGE CASTING AND SOLIDIFICATION SECTION
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The research is presented in three parts. 1 Filtration of Aluminum Alloys - The effectiveness of various filter media in removing oxide particles and synthetic inclusions such as TiB2 from aluminum alloys was investigated. Results showed that by proper choice of filters, particles of different sizes can be effectively filtered from aluminum alloys. Pressures required for metal flow through the smallest pore filters were less than 60 psi. 2 Specific Permeability of Partially Solidified Dendritic Networks of Al-Si Alloys - Segregated interdendritic liquid was successfully removed from partially solidified Al-Si alloys. Porous columnar, equiaxed and grain refined dendritic networks of the alloys were prepared. Specific permeabilities of the porous dendritic networks were measured using a triaxial cell permeameter. For equivalent volume fraction solid, the permeabilities of the grain refined samples were found to be lower than those of the non-grain refined samples. Flow through the partially solid non-grain refined samples obeyed DArcys law. 3 Casting of Aluminum Alloy - Particulate Ceramic Composites - A new process for the preparation and casting of metal-ceramic composites is described. Particulate composite end chill plates containing Al2O3, SiC or glass beads in an Al-Si-Fe alloy matrix were successfully prepared. These plates exhibited good abrasion resistance and improved hardness. Author
- Properties of Metals and Alloys