A high-strength aluminum composite plate and its barrier layer and preparation method

By introducing a barrier layer of alloying elements such as Ti, Sc, V or Hf into the aluminum composite plate and controlling its solid solubility and grain morphology, the strength loss problem caused by Mg diffusion is solved, and the welding effect and mechanical properties of the aluminum composite plate are improved.

CN119078306BActive Publication Date: 2025-09-19HUAFENG ALUMINUM CO LTD
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Patent Information

Application Number
CN202411190603.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-28
Publication Date
2025-09-19
Estimated Expiration
2044-08-28

AI Technical Summary

Technical Problem

During the brazing process of existing high-strength aluminum composite plates, the Mg element easily diffuses, resulting in strength loss and flux poisoning, affecting the welding effect. The existing barrier layer design cannot effectively prevent Mg diffusion and increase the strength of the composite material.

Method used

A barrier layer containing alloying elements such as Ti, Sc, V or Hf is used. By controlling their total solid solubility and recrystallized grain morphology, the diffusion activation energy is increased, the Mg diffusion is reduced, and a three-layer aluminum alloy composite plate structure is designed to optimize the Mg diffusion barrier.

Benefits of technology

The diffusion activation energy of the barrier layer is increased while ensuring the diffusion of the Mg element in the aluminum composite plate, thereby reducing the diffusion distance of the Mg element and improving the mechanical properties and welding quality of the composite material.

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Abstract

The present invention provides a high-strength aluminum composite plate, a barrier layer therefor, and a preparation method. The barrier layer includes any one or a combination of at least two of the alloying elements Ti, Sc, V, or Hf, with the alloying elements Ti, Sc, V, or Hf being denoted as barrier elements. The total solid solubility of the barrier elements in the barrier layer is at least 0.06 wt%. By optimizing the composition and controlling the structure of the barrier layer alloy, the present invention increases the diffusion activation energy of Mg in the barrier layer, reduces the diffusion coefficient, and shortens the diffusion distance of Mg. This reduces the thickness of the barrier layer in the high-strength aluminum composite plate, improves the strength of the high-strength aluminum composite plate, and reduces Mg loss in the core layer, further ensuring the strength of the high-strength aluminum composite plate.
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