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ALUMINUM ALLOYS WITH GRAIN REFINERS, AND METHODS FOR MAKING AND USING THE SAME

We have developed a scalable approach to directly incorporate grain-refining nanoparticles into conventional hot-tear-susceptible aluminum alloy powders. These aluminum alloy powders may be additively manufactured into high-strength, crack-free aluminum alloys with fine equiaxed microstructures by incorporating nanoparticle nucleants to control solidification during additive manufacturing. Some variations provide an additively manufactured aluminum alloy comprising aluminum, one or more strengthening elements, and at least one grain-refining element, wherein the additively manufactured aluminum alloy has a microstructure with equiaxed grains. Aluminum alloys with grain refiners are useful in many processes beyond additive manufacturing. Some variations provide an aluminum alloy comprising aluminum, copper, magnesium, at least one of zinc or silicon, and grain-refining nanoparticles selected from zirconium, tantalum, niobium, or titanium, wherein the aluminum alloy has a microstructure that is substantially crack-free with equiaxed grains.


» Number: US2019032175A1 (A1)

» Publication Date: 19//2/31/0

» Applicant: HRL LAB LLC?[US]

» Inventor: MARTIN JOHN H?[US]; YAHATA BRENNAN?[US]

» More Information

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [310187].