A method for controlling the heterogeneous structure of an aluminum alloy having alternating fine and coarse grain characteristics

By adjusting the processes of arc-fused wire additive manufacturing, interlayer plastic deformation, and annealing, a heterogeneous aluminum alloy structure with alternating fine and coarse grains was prepared, solving the problem of low mechanical properties in existing aluminum alloy additive manufacturing technologies and achieving efficient manufacturing and performance improvement of heterogeneous structures.

CN117444241BActive Publication Date: 2026-06-02SHENYANG AEROSPACE UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHENYANG AEROSPACE UNIVERSITY
Filing Date
2023-10-31
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing additive manufacturing technologies struggle to effectively fabricate aluminum alloy heterostructures with alternating fine and coarse grain structures, resulting in poor mechanical properties. Furthermore, brittle intermetallic compounds easily form at the interface of heterostructures, affecting performance.

Method used

By combining arc-wire additive manufacturing, interlayer plastic deformation, and post-annealing heat treatment, a heterogeneous microstructure with alternating fine and coarse grains is prepared by adjusting the heat input, deformation amount, annealing temperature, and time of additive manufacturing, and the proportion of these grains is controlled.

Benefits of technology

It significantly improves the mechanical properties of aluminum alloy additive manufacturing, reduces defects, and enhances its application potential in aerospace engineering.

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Abstract

The application provides an aluminum alloy heterogeneous structure regulation method with fine and coarse grain alternating organization characteristics, and fine and coarse grain alternating organization characteristics can be obtained through interlayer plastic deformation composite additive manufacturing; the proportion of the fine and coarse grain organization is regulated by adjusting composite manufacturing parameters and / or heat treatment process parameters; the composite manufacturing parameters include additive heat input and / or interlayer plastic deformation amount; the application combines the electric arc wire additive manufacturing technology, the interlayer plastic deformation process and the post-annealing heat treatment process, and the regulation of the proportion of the fine and coarse grain organization can be realized by changing the additive manufacturing heat input, the deformation amount and the subsequent annealing temperature and time, and the additive manufacturing structural member with better mechanical properties can be obtained.
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