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Casting method of aluminum alloy

A technology of aluminum alloy and alloy, which is applied in the field of alloy casting, can solve the problem that ingots cannot be used

Inactive Publication Date: 2019-05-14
青岛四通八达商贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These defects can be removed by machining, and in some cases the presence of cracks renders the ingot unusable and must be remelted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0005] The method of the present invention is applicable to highly oxidizable aluminum alloys containing at least about 0.1% magnesium and / or at least about 0.1% lithium, and the method of the present invention is particularly applicable to aluminum alloys of the 2XXX, 3XXX, 5XXX, 6XXX, 7XXX or 8XXX series alloys, especially when these alloys do not contain intentionally added beryllium and / or calcium. The method of the invention is particularly advantageous for alloys containing less than 3 ppm beryllium, or even less than 1 ppm beryllium and / or less than 15 ppm calcium, or even less than 5 ppm calcium. Examples of alloys for which the method of the invention is particularly advantageous are: alloys AA2014, AA2017, AA2024, AA2024A, AA2027, AA2139, AA2050, AA2195, AA2196, AA2098, AA2198, AA2214, AA2219 and AA2524 in the 2XXX series of alloys; Alloys AA3003, AA3005, AA3104, and AA3915; alloys AA5019, AA5052, AA5083, AA5086, AA5154, AA5182, AA5186, AA5383, AA5754, and AA5911 in ...

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Abstract

The invention relates to a casting method of aluminum alloy containing at least about 0.1% of magnesium and / or at least about 0.1% of lithium. In most process of solidification, the liquid surface ofthe alloy is made to make contact with dry air containing at least about 2% by volume and having the moisture pressure lower than 150 Pa. The casting method is characterized in that the aluminum alloywith quite high degree of oxidation, particularly the aluminum alloy containing magnesium and / or lithium can be cast safely without additives like beryllium and / or calcium and without any expensive device and / or gas, and ingots with no surface defect and pollution are available.

Description

technical field [0001] This invention relates to the casting of aluminum alloys, and in particular to the casting of oxidation-sensitive alloys containing magnesium and / or lithium. Background technique [0002] Oxidation of liquid aluminum alloys can have detrimental consequences during casting. Oxidation of metal in furnaces and transfer sprues first results in a net loss of metal, called loss on ignition. In addition, during the casting process, excessive oxidation of the liquid metal produces surface defects on the ingot, which have a detrimental effect on the use of the product produced. These problems are particularly pronounced for alloys containing magnesium and / or lithium. [0003] A major defect is the vertical wrinkling on the surface of the sump especially due to the wrinkling of the oxide film. In some cases, especially when casting 7xxx alloys, this problem can be particularly serious because these folds, especially when they are long and deep, tend to cause ...

Claims

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Application Information

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IPC IPC(8): B22D21/04
Inventor 吕志敏
Owner 青岛四通八达商贸有限公司