A fine-grained superplastic magnesium alloy with low alloy content and a preparation method thereof

CN117363938BActive Publication Date: 2026-01-30JILIN UNIVERSITY
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Patent Information

Application Number
CN202311320142.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-12
Publication Date
2026-01-30
Estimated Expiration
2043-10-12

AI Technical Summary

Technical Problem

Existing technologies make it difficult to obtain fine-grained superplastic magnesium alloys with low alloy content at low cost, and high alloying strategies increase production costs, making it difficult to meet the production needs of complex-shaped components.

Method used

Using a low-alloy composition (Al 0.6-1.1%, Ca 0.2-0.4%, Mn 0.3-0.5%, impurities ≤0.05%, balance Mg), a uniform, fine-grained, superplastic magnesium alloy was prepared by melting and refining under CO2 and SF6 protection, followed by multi-stage step solution treatment and constant diameter angular extrusion. Through the synergistic effect of alloy composition, proportion, and process parameters, a uniform, fine-grained, superplastic magnesium alloy was prepared.

Benefits of technology

It achieves a uniform fine-grained microstructure (average grain size 1-2 μm) with low alloy content, and a fracture elongation of >320% at 325℃ and 1×10-3s-1 strain rate, which significantly reduces production costs and process complexity.

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Abstract

This invention provides a low-alloy-content fine-grained superplastic magnesium alloy and its preparation method. The magnesium alloy, by mass percentage, comprises: Al 0.6-1.1%, Ca 0.2-0.4%, Mn 0.3-0.5%, unavoidable impurities ≤0.05%, and the balance being Mg. The preparation method of the magnesium alloy mainly includes: (1) casting the magnesium alloy melt to obtain an ingot; (2) homogenizing the ingot and then extruding it; (3) performing multiple low-temperature variable extrusion rate equal-diameter angular extrusion treatments. Without adding rare earth elements, the low-alloy-content fine-grained superplastic magnesium alloy prepared by this invention has a uniform fine-grained structure and excellent high-temperature tensile properties. The alloy exhibits an elongation >320% at 325℃. This invention realizes the preparation of low-alloy-content rare-earth-free superplastic magnesium alloys, reduces processing temperature, eliminates the solution treatment before equal-diameter angular extrusion and the annealing step after equal-diameter angular extrusion, and improves alloy performance while contributing to the economical production of superplastic magnesium alloys.
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Citation Information

Patent Citations

  • Sheet metal made of magnesium base alloy and method for producing sheet metal and sheet metal component from said alloy

    CN109923230A

  • Low-alloy-content high-strength plastic magnesium alloy and preparation method thereof

    CN115821136A