A semi-solid injection multi-element micro-alloyed Al-Zn series magnesium alloy and a preparation method thereof

By employing Bi-Te-Eu ternary microalloying and gradient heat treatment processes, a grain boundary discrete microtube core-shell structure was constructed, which solved the problem of insufficient plasticity and corrosion resistance of magnesium alloys. This enabled the forming of high-strength, high-toughness, and low-corrosion magnesium alloys, suitable for aerospace, automotive lightweighting, and 3C electronics fields.

CN122445984APending Publication Date: 2026-07-24TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Filing Date
2026-04-24
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The β-Mg17Al12 phase continuously distributed at the grain boundaries in existing magnesium alloys deteriorates plasticity. Traditional heat treatment processes are difficult to control grain boundary characteristics, resulting in high corrosion rates and increased costs. There is a lack of dedicated alloy systems and supporting processes for high strength, toughness and corrosion resistance.

Method used

By constructing a grain boundary discrete microtube core-shell structure through Bi-Te-Eu ternary synergistic microalloying, and combining semi-solid injection molding with a dedicated gradient heat treatment process, including three-stage gradient solution treatment and two-stage aging treatment, nanopillars with a Bi-rich core phase, a Te-rich shell layer and an Eu-rich surface layer are formed, which block corrosion channels and improve strength and plasticity.

Benefits of technology

It significantly reduces the continuous area of ​​grain boundaries, improves tensile strength, yield strength and elongation, reduces corrosion rate, shortens heat treatment time and energy consumption, enhances the comprehensive performance of magnesium alloys, and is suitable for forming complex structural parts.

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Abstract

The application belongs to the technical field of metal materials, and particularly relates to a kind of multi-element micro-alloyed Al-Zn series magnesium alloy for semi-solid injection and a preparation method thereof, which comprises the following steps: raw materials and pretreatment; vacuum induction melting and purification are carried out on the raw materials to obtain a melt containing multi-element micro-alloyed Al-Zn series; the melt is rapidly solidified and powdered to obtain petal-shaped magnesium alloy granules; the magnesium alloy granules are subjected to semi-solid injection molding to obtain a magnesium alloy molded part; the magnesium alloy molded part is subjected to special gradient heat treatment to obtain a magnesium alloy heat-treated part; and finishing treatment is carried out on the surface of the magnesium alloy heat-treated part. In addition, the application also prepares a multi-element micro-alloyed Al-Zn series magnesium alloy by using the above preparation method. The application realizes the synergistic improvement of strength-plasticity-corrosion resistance by constructing a unique grain boundary dispersed micro-tube core-shell structure and combining semi-solid injection molding and special heat treatment process.
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