A preparation method of ternary nano-enhanced aluminum matrix composite based on in-situ laser remelting

By generating ternary nanosolid solutions through in-situ laser remelting, the problem of partial melting of ceramic particles in existing technologies has been solved, enabling efficient preparation and performance improvement of aluminum-based composite materials, which are applicable to aerospace, automotive and other fields.

CN118060556BActive Publication Date: 2026-06-30NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2024-01-19
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In existing technologies, aluminum-based composites with nanoscale ceramic particles as reinforcing phases only partially melt after laser forming, which reduces the interfacial bonding performance between the reinforcing phase and the matrix, limiting the improvement of material properties. Furthermore, the process is difficult and costly.

Method used

The scanning strategy of in-situ laser remelting is adopted to mix micron-sized TiC and ZrC ceramic powders with aluminum alloy powders, and then perform in-situ laser remelting through a laser powder bed melting and forming equipment to generate ternary nano solid solutions. This promotes the complete melting or reaction of micron-sized ceramic particles to form ternary nano solid solutions, thereby increasing their uniform distribution and distribution density in the matrix.

Benefits of technology

It improves the mechanical properties of the material, shortens the production cycle, reduces production costs, and enables the forming of parts with complex geometries. The strength and hardness of the material are significantly improved.

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Abstract

This invention discloses a method for preparing ternary nano-reinforced aluminum matrix composites based on in-situ laser remelting. During laser forming, an in-situ laser remelting scanning strategy is employed to further melt or completely melt micron-sized TiC and ZrC ceramic particles. In subsequent rapid solidification, a (Ti,Zr)C ternary nano-solid solution is generated and precipitated in the matrix. These ternary nano-solid solutions are uniformly dispersed and have a high distribution density in the matrix, providing numerous effective nucleation sites. This increases the nucleation rate while reducing grain growth rate, refining grain size, and hindering dislocation movement, thus providing dispersion strengthening. Compared to micron-sized ceramic reinforcing phases, the in-situ generated ternary nano-solid solutions exhibit better interfacial bonding with the matrix, refining grain size and hindering dislocation movement, thereby transferring interfacial loads and improving the material's strength.
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