Aluminum-copper alloy powder for 3D printing and preparation method thereof

Abstract

The invention relates to a preparation method of aluminum-copper alloy powder for 3D printing, and belongs to the technical field of 3D printing of metal powder. After being heated and molten, aluminum-copper alloy raw materials are fully mixed evenly; aluminum-copper alloy powder is prepared by a gas atomization technology; after gas atomization, the aluminum-copper alloy powder is sieved to obtain the aluminum-copper alloy powder for 3D printing within the required particle size range; and the proportion of aluminum and copper in the aluminum-copper alloy raw materials meets the aluminum-copper alloy powder for 3D printing, specifically, the Cu content is 1.00%wt to 8.00%wt, the Mg content is 0.10%wt to 4.00%wt, the Si content is 0.05%wt to 3.00%wt, the Mn content is 0.04%wt to 2.50%wt,the Zr content is 0.01%wt to 3.00%wt, and the balance is Al. The strength of a sample prepared by selective laser melting (SLM) of the aluminum-copper alloy powder is equal to that of an SLM aluminum-silicon alloy, but the elongation of the sample is obviously higher than that of the common SLM aluminum-silicon alloy, the using demands for an aluminum alloy in most cases can be met, the complex post-treatment process of the malleable aluminum alloy is reduced, and energy and the cost are saved.

Description

Technical field [0001] The invention belongs to the technical field of 3D printing, and particularly relates to an aluminum copper alloy powder used for 3D printing and a preparation method thereof. Background technique [0002] 3D printing is a manufacturing technology that uses three-dimensional model data to obtain products with complex shapes through layers of accumulation. Compared with the traditional preparation methods of plastics, ceramics, metals and alloys, and composite materials, 3D printing technology has a series of advantages such as the ability to prepare high-precision and complex-shaped products, saving raw materials, and saving costs, and has good application prospects. Currently commonly used 3D printing methods include direct three-dimensional printing technology (3DP), selective laser melting technology (SLM), stereo light curing technology (SLA), fused deposition technology (FDM), etc., among which selective laser melting technology (SLM) It is widely use...

AI Technical Summary

Problems solved by technology

The aluminum-silicon alloy prepared by SLM technology has a maximum tensile strength of about 450MPa, an elongation of about 4%, moderate tensile strength and low elongation

2xxx, 7xxx and other series of aluminum alloys with higher strength and better ductility often produce a large number of cracks during SLM processing, resulting in cracks, resulting in poor product performance, which is far from being comparable to conventionally manufactured aluminum alloys. Therefore, Difficult to fabricate by SLM technology

[0006] 2xxx aluminum alloys have high specific strength, excellent fatigue properties and good damage resistance, and are widely used in aerospace and other fields, but the aluminum-copper alloys prepared by traditional methods need to undergo complex post-processing (heat treatment, cold working, hot working and / or stretching), in order to obtain optimized properties, such as high strength, etc.

However, the content of rare earth elements is low and the price is expensive, which is not conducive to large-scale promotion and application