A heat-resistant, high-strength, rare-earth-reinforced aluminum alloy formula and preparation method for 3D printing

Preparing heat-resistant and high-strength rare earth-strengthened aluminum alloy powder through 3D printing technology solves the problem of insufficient performance of traditional aluminum alloys under high temperature conditions and achieves multi-scale synergistic strengthening effects of high strength, heat resistance and creep resistance.

CN117626060BActive Publication Date: 2025-01-24CENT SOUTH UNIV
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Patent Information

Application Number
CN202311370733.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-23
Publication Date
2025-01-24
Estimated Expiration
2043-10-23

AI Technical Summary

Technical Problem

Traditional aluminum alloys are difficult to meet the high strength, heat resistance and creep resistance requirements in aerospace and other fields under high temperature conditions.

Method used

Heat-resistant and high-strength rare earth-strengthened aluminum alloy powder is prepared using 3D printing technology. Through vacuum smelting and argon atomization powdering process, elements such as Cr, Fe, Sc, Zr, Er, V and Si are added to form a multi-scale synergistically strengthened alloy. structure.

Benefits of technology

The high strength, heat resistance and creep resistance of the alloy at high temperature, the tensile strength at room temperature exceeds 520MPa, the tensile strength of 300 ° C exceeds 300MPa, the extension rate exceeds 10%, which significantly improves the high temperature comprehensive performance of aluminum alloy. Essence

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Abstract

The present invention discloses a formula of heat-resistant, high-strength, rare-earth-reinforced aluminum alloy powder for 3D printing. The alloy powder is a pre-alloyed powder, and the composition is (mass fraction) in terms of mass percentage, Cr: 0.5-4wt%; Fe: 0.5-4wt%; Sc: 0.05-0.7wt%; Zr: 0.1-0.9wt%; Er: 0.0-0.3wt%; V: 0.01-0.3wt%; Si: 0.02-0.5wt%, and the rest is Al. On the one hand, this invention fills the research gap of alloy heat resistance in the field of 3D printing, explores and finally designs a heat-resistant aluminum-scandium alloy system for laser powder bed fusion forming (LPBF), so that it has excellent mechanical properties such as no cracks, high strength, and high toughness, laying the foundation for designing high-performance heat-resistant aluminum alloys for LPBF forming. On the other hand, the alloy has low cost and is suitable for mass production. It utilizes the synergistic strengthening effect between elements to maximize the strengthening effect of the precipitated particles and maintains the matrix strength at high temperatures, thereby achieving excellent high-temperature performance.
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Citation Information

Patent Citations

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    CN106834814A

  • High-strength high-toughness heat-resistant aluminum-iron alloy and 3D printing method thereof

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