A TiO2 in-situ modified aluminum matrix composite material for additive manufacturing and its preparation method

By generating Al3Ti particle-reinforced aluminum-based composite materials through laser melting and forming, the problem of microstructure control in aluminum-based composite materials in traditional methods has been solved. This method achieves synergistic optimization of high strength and toughness, forms a multi-level refined heterogeneous grain structure, and improves the overall performance of the material.

CN122327031APending Publication Date: 2026-07-03TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Filing Date
2026-04-13
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Traditional powder metallurgy processes are difficult to achieve precise and orderly multi-scale microstructure control of aluminum-based composite materials in additive manufacturing. Furthermore, the added ceramic particles have problems such as poor dispersion and weak interfacial bonding, resulting in high hot cracking sensitivity of additively manufactured high-strength aluminum alloys and making it difficult to achieve synergistic optimization of high strength and toughness.

Method used

TiO2 powder and AA2024 aluminum alloy powder are mixed and then laser-melted to generate an Al3Ti reinforcing phase in situ. The laser powder bed melting technology is used to realize the in-situ reduction reaction of TiO2 and liquid aluminum at high temperature, generating fine and uniformly distributed Al3Ti particles, forming a multi-level refined heterogeneous grain structure.

Benefits of technology

It significantly improves the strength and hardness of aluminum-based composite materials, enhances the toughness and crack propagation resistance of the materials, achieves synergistic optimization of strength and toughness, and avoids the problems of uneven distribution of reinforcing phase and weak interfacial bonding in traditional methods.

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Abstract

This invention discloses a TiO2 in-situ modified aluminum-based composite material for additive manufacturing and its preparation method, belonging to the technical field of additive manufacturing for preparing aluminum-based composite materials. The method includes the following steps: mixing and sieving TiO2 powder with AA2024 aluminum alloy powder; laser melting the mixed powder to form a composite material, thereby in-situ modifying the AA2024 aluminum alloy with TiO2 to generate an Al3Ti particle-reinforced aluminum-based composite material. This invention utilizes laser melting technology to achieve in-situ modification of the AA2024 aluminum-based composite material with TiO2, resulting in a uniformly dispersed reinforcing phase at the nanometer to submicron scale within the matrix. Simultaneously, it induces the formation of a multi-layered, refined heterogeneous grain structure, significantly improving the material's strength and hardness. Therefore, this invention has significant technical advantages and broad application prospects.
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