High-strength heat-resistant deformation magnesium alloy and short-process high-efficiency preparation method thereof

By using a few-pass continuous rolling process and multi-stage solution treatment, a high-strength, heat-resistant deformable magnesium alloy with a multi-level microstructure is formed, which solves the problems of poor heat resistance and high processing difficulty of magnesium alloys. This achieves efficient and low-cost magnesium alloy preparation, which is suitable for high-temperature engineering fields.

CN122279342APending Publication Date: 2026-06-26JILIN UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JILIN UNIVERSITY
Filing Date
2026-05-26
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing magnesium alloys have poor heat resistance, their strength decreases sharply with increasing service temperature, they are difficult to process, have low yield, and cannot meet the needs of high-temperature engineering fields. Moreover, existing processes are complex and costly, and it is difficult to simultaneously improve room temperature strength and plasticity and reduce high-temperature degradation rate.

Method used

By employing a short-pass continuous rolling process and using specific alloy compositions and multi-stage solution treatment, a multi-level microstructure is formed, including ultrafine grains, coarse grains, fine grains, and β and γ' precipitates. Combined with melting and gravity casting under CO2 and SF6 gas protection, this process avoids constant diameter angular extrusion and traditional slow extrusion, enabling the short-process preparation of high-strength, heat-resistant, and deformable magnesium alloys.

Benefits of technology

It significantly improves the room temperature strength and ductility and high temperature stability of magnesium alloys. The tensile strength decay rate is less than 1% in the range of 100~200 ℃. It simplifies the process, increases the yield, and reduces the production cost, making it suitable for the industrial production of magnesium alloys.

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Abstract

This invention belongs to the field of magnesium alloys, and relates to a high-strength, heat-resistant, and deformable magnesium alloy and its short-process, high-efficiency preparation method. By mass percentage, it consists of the following components: Gd: 7.0~7.6 wt.%, Y: 3.0~3.5 wt.%, Zr: 0.1~0.3 wt.%, Zn: 1.2~1.5 wt.%, with the balance being Mg and unavoidable impurities ≤0.05%. The alloy preparation method includes: melting, gravity casting, multi-stage solution heat treatment, and short-pass continuous rolling, resulting in a magnesium alloy with a tensile strength of 390~460 MPa. Under high-temperature stretching at 100~200 ℃, the tensile strength reduction rate is 0~1%; specifically, under high-temperature stretching at 100 ℃, the tensile strength reduction rate is 0~0.25%; under high-temperature stretching at 150 ℃, the tensile strength reduction rate is 0.1~0.5%; and under high-temperature stretching at 200 ℃, the tensile strength reduction rate is 0.1~0.5%. High-temperature tensile testing at ℃ resulted in a tensile strength reduction rate of 0.25~1%. This invention eliminates the need for intermediate annealing and slow extrusion processes, achieving a short-process, high-efficiency manufacturing. The resulting magnesium alloy consists of a multi-level microstructure including ultrafine grains, coarse grains, fine grains, precipitates, and interfacial solute co-segregation.
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