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US 4,731,132 AGranted
Oxide dispersion hardened aluminum composition
AssigneeTechnical Research Associates, Inc.
InventorGuy B. Alexander
Life of this patent
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Abstract
Refractory metal oxide particles are dispersed in an aluminum melt which is then cast to form a dispersion hardened aluminum alloy composition. A master mix of carrier metal particles surrounding individual oxide particles is pressed into a billet. The billet is dissolved in the melt in the presence of a wetting metal.
Claims16
A metallic product in cast form, said cast product comprising:
- a matrix consisting essentially of aluminum;
- particles of a strengthening oxide dispersed throughout said matrix;
- said strengthening oxide having a free energy of formation greater than 100 K Cal/gram atom of oxygen in the oxide;
- and a wetting metal for said stengthening oxide;
- said wetting metal being reactive to form an oxide having a free energy of formation greater than that of said strengthening oxide;
- said particles of strengthening oxide having a mean particle size no greater than 0.025 microns;
- said particles of strengthening oxide occupying no greater than 1% of the volume of said metallic product;
- the interparticle spacing for said particles being less than 0.2 microns;
- said cast product being weldable without destroying its physical properties at the temperature of welding.
6 more elements
Dependencies are inferred from the claim text.