Clean aluminum alloys and methods for forming such alloys
AssigneeJohnson Brass & Machine Foundry, Inc.
InventorsArvin Montes, Lance Johnson
Life of this patent
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Abstract
A method comprises providing a molten aluminum alloy selected from the group consisting of 6000 series aluminum alloys comprises chromium (Cr) in a range of between 0.001 wt % to 0.05 wt %. The molten aluminum alloy is formed into a formed body having beta-AlFeSi particles. The formed body is solution heat treated at a temperature in a range of 1,025-1,050° F. to form a heat-treated body. The solution heat treating transforms substantially all of the beta-AlFeSi particles into alpha-AlFeSi particles such that the heat-treated body is substantially free of the beta-AlFeSi particles.
Claims17
A method, comprising:
- providing a molten aluminum alloy selected from the group consisting of 6000 series aluminum alloys comprising chromium (Cr) in a range of 0.001 wt % to 0.05 wt %;
- forming the molten aluminum alloy into a formed body having beta-AlFeSi particles;
- solution heat treating the formed body at a temperature in a range of 1,025-1,050° F. to form a heat-treated body, the solution heat treating transforming substantially all of the beta-AlFeSi particles into alpha-AlFeSi particles such that the heat-treated body is substantially free of the beta-AlFeSi particles;
- heat aging the heat-treated body to form an aged body;
- and
- anodizing the aged body in a mixed acid bath,
- wherein the cast aluminum alloy article has a breakdown voltage of greater than 1,380 V/mil.
Dependencies are inferred from the claim text.