A method of designing a multi-scale microstructure strengthened and plasticized aluminum alloy

By employing a process of solution treatment, large deformation cold rolling, cryogenic treatment, and aging treatment, a multi-scale microstructure is formed, which solves the problem of significantly improving the plasticity of Al-Cu-Mg alloys while maintaining their strength, thus achieving a performance improvement of high-strength and high-plasticity aluminum alloys.

CN117867346BActive Publication Date: 2026-06-19HUNAN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN UNIV OF SCI & TECH
Filing Date
2023-12-08
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies struggle to significantly improve the plasticity of Al-Cu-Mg alloys while maintaining their strength; traditional methods often lead to a decrease in strength when improving plasticity.

Method used

The process of solution treatment, large deformation cold rolling, cryogenic treatment and aging treatment is adopted to form a multi-scale microstructure, including micron-sized grains, micron-sized dislocation arrays, nano-Al2CuMg phase and micron-sized spider web subgrain structure. By controlling the dislocation distribution, the strength and plasticity are synergistically improved.

Benefits of technology

Without reducing strength, the plasticity of Al-Cu-Mg alloy is significantly improved, with hardness greater than 190Hv0.1, tensile strength greater than 600MPa, and plasticity increased by more than 100%.

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Abstract

This invention relates to a design method for multi-scale microstructure-strengthened and plasticized aluminum alloys. The multi-scale microstructure exhibits both strengthening and plasticizing effects, resulting in a product with a hardness greater than 190 Hv. 0.1 Furthermore, the tensile strength is greater than 600 MPa, and the plasticity of the product is improved by at least 100%. The multi-scale microstructure includes micron-sized grains, nano-sized dislocation arrays, nano-sized Al2CuMg phase, and micron-sized spiderweb-like subcrystalline structure. The product comprises the following components by mass percentage: copper 2.0–4.2%, magnesium 0.1–2.8%, iron 0.1–0.6%, manganese 0.2–1.5%, silicon 0.05–0.9%, with the balance being aluminum. The preparation method includes sequentially performing solution treatment, water quenching, large deformation cold rolling with a deformation of ≥30%, liquid nitrogen cryogenic treatment, and aging treatment to obtain the Al-Cu-Mg alloy product. The process of this invention is simple and controllable, and the resulting product has superior performance, facilitating large-scale industrial application.
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