L12 aluminum alloys with bimodal and trimodal distribution
AssigneeUnited Technologies Corporation
InventorAwadh B. Pandey
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Abstract
A two or three phase aluminum alloy having high strength, modulus, ductility and toughness, comprising a fine grain matrix phase nano L12 alloy having a particle size ranging from about 20 nm to 5 microns and a more ductile larger aluminum alloy coarse grain phase having a particle size ranging from about 25 to 250 microns. The fine grain matrix phase alloy comprises aluminum, at least one of scandium, erbium, thulium, ytterbium, and lutetium; and at least one of gadolinium, yttrium, zirconium, titanium, hafnium, and niobium. The alloy may also include ceramic reinforcements in addition to the fine grain matrix phase and the coarse grain phase.
Claims13
An aluminum alloy with at least a bimodal microstructure comprising large grains in a fine grained matrix wherein:
- the large grains comprise any aluminum alloy having a grain size ranging from about 25 to about 250 microns;
- and
- the fine grain matrix having a grain size ranging from about 20 nm to about 5 microns comprises an aluminum alloy strengthened with L12 Al3X dispersoids wherein X comprises at least one first element selected from scandium, erbium, thulium, ytterbium, and lutetium, and at least one second element selected from gadolinium, yttrium, zirconium, titanium, hafnium, and niobium.
Dependencies are inferred from the claim text.