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US 6,485,583 B1Granted
Aluminium-lithium alloy
AssigneeQinetiq Limited
InventorsWendy J Vine, Andrew D Tarrant
Life of this patent
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Abstract
A dispersion strengthened mechanically alloyed aluminium based alloy is provided which is prepared by mechanical alloying and is characterized by improved isotropic strength, fracture toughness and corrosion resistance. The alloy system contains by weight 1.2 to 1.6% lithium, 4.0 to 6.0% magnesium, 0.15 to 0.7% carbon, up to 1% oxygen and up to 2.0% in total of one or more grain controlling elements to provide microstructural optimization and control, the balance aluminium save for incidental impurities.
Claims8
A method for the production of an aluminum-based alloy product comprising:
- (1) preparing a mechanically alloyed powder having a composition within the following ranges, all of the ranges being specified in weight percent:
- lithium 1.2 to 1.4 magnesium 4.5 to 5.5 carbon 0.25 to 0.40 oxygen up to 1.0
- and optionally, up to 2.0 of grain controlling elements, said elements being selected from scandium, titanium, vanadium and niobium at up to 0.2 weight percent, nickel and chromium at up to 0.5 weight percent, hafnium at up to 0.6 weight percent, and cerium at up to 0.5 weight percent, the balance being aluminum and incidental impurities;
- (2de-gassing and consolidating the powder at an elevated temperature, followed by
- (3) fabricating the de-gassed and consolidated powder into an ultimate product form of the same composition.
2 more elements
Dependencies are inferred from the claim text.