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A kind of corrosion-resistant high-strength toughness magnesium alloy and preparation method thereof

A magnesium alloy and corrosion-resistant technology, which is applied in the field of corrosion-resistant high-strength and tough magnesium alloy and its preparation, can solve the problems of increasing the preparation cost, reducing the forming ability of magnesium-zinc-calcium alloy and the like, and achieves cost control, promotion of aging kinetics, The effect of grain refinement

Active Publication Date: 2021-11-12
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when alloying to improve the corrosion resistance of magnesium alloys, it is often necessary to add a higher content of alloying elements, which leads to an increase in the preparation cost; at the same time, high content of alloying elements will also reduce the forming ability of magnesium-zinc-calcium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take the Mg-0.1Zn-0.04Ca-0.01Sm-0.01Sr-0.4Gd alloy as an example (according to the composition mass percentage: Zn: 0.1%, Ca: 0.04%, Sm: 0.01%, Sr: 0.01%, Gd: 0.4 %, the unavoidable sum of impurities≤0.05%, and the balance is magnesium), and its preparation method is as follows:

[0024] (1) Under the protection of argon, add pure magnesium, pure zinc, magnesium-calcium master alloy, magnesium-samarium master alloy, magnesium-strontium master alloy in sequence, and heat and melt at 670-710°C; then add magnesium-gadolinium master alloy Alloy, stir evenly at 670-700°C, refine and degas, and obtain alloy melt after slag removal;

[0025] (2) performing rapid casting and rolling on the alloy melt obtained in step (1), the casting and rolling speed is 10 m / min, and the thickness of the billet in the cast-rolled state is 1.3-3.2 mm, so as to obtain the billet in the cast-rolled state;

[0026] (3) performing a homogeneous heat treatment on the cast-rolled billet obtained in ...

Embodiment 2

[0031] Take the Mg-0.5Zn-0.25Ca-0.05Sm-0.02Sr-0.05Er alloy as an example (according to the composition mass percentage: Zn: 0.5%, Ca: 0.25%, Sm: 0.05%, Sr: 0.02%, Er: 0.05 %, the unavoidable sum of impurities≤0.05%, and the balance is magnesium), and its preparation method is as follows:

[0032] (1) Under the protection of argon, add pure magnesium, pure zinc, magnesium-calcium master alloy, magnesium-samarium master alloy, magnesium-strontium master alloy in turn, heat and melt at 680-720°C; then add magnesium-erbium master alloy Alloy, stir evenly at 680-710°C, refine and degas, and obtain alloy melt after slag removal;

[0033] (2) The alloy melt obtained in step (1) is subjected to rapid casting and rolling, the casting and rolling speed is 5 m / min, and the thickness of the billet in the cast-rolled state is 4 mm, so as to obtain the billet in the cast-rolled state;

[0034] (3) Carrying out homogeneous heat treatment to the cast-rolled billet obtained in step (2), the t...

Embodiment 3

[0040] Take the Mg-1Zn-0.2Ca-0.1Sm-0.02Sr-0.01Pr alloy as an example (according to the composition mass percentage: Zn: 1%, Ca: 0.2%, Sm: 0.1%, Sr: 0.02%, Pr: 0.01% , the unavoidable sum of impurities≤0.05%, and the balance is magnesium), and its preparation method is as follows:

[0041] (1) Under the protection of argon, add pure magnesium, pure zinc, magnesium-calcium intermediate alloy, magnesium-sarium intermediate alloy, magnesium-strontium intermediate alloy in sequence, and heat and melt at 690-730°C; then add magnesium-praseodymium intermediate Alloy, stir evenly at 690-720°C, refine and degas, and obtain alloy melt after slag removal;

[0042] (2) The alloy melt obtained in step (1) is subjected to rapid casting and rolling, the casting and rolling speed is 5.5 m / min, and the thickness of the billet in the cast-rolled state is 4.5 mm, so as to obtain the billet in the cast-rolled state;

[0043] (3) Carrying out homogeneous heat treatment to the cast billet obtained...

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Abstract

The invention belongs to the technical field of metal materials, and discloses a corrosion-resistant high-strength and tough magnesium alloy and a preparation method thereof; the magnesium alloy composition mass percentages are: zinc: 0.04-3%, calcium: 0.04-0.45%, samarium: 0.01-0.01 0.45%, strontium: 0.01‑0.45%, and the rest are magnesium, additive elements and unavoidable impurities. The additive elements are one or any combination of gadolinium, erbium, and praseodymium, and the addition amount is calculated by percentage: gadolinium: 0‑0.45%, erbium: 0‑0.45%, praseodymium: 0‑0.45%; preparation methods include: alloy melting, rapid casting and rolling, multi-pass rolling, solution heat treatment and artificial aging. The added trace rare earth elements interact with other solute atoms to regulate the degree of atomic segregation at grain boundaries, intragranular defects or phase boundaries, thereby realizing the regulation of the corrosion resistance of magnesium alloys. The magnesium alloy of the invention not only has high strength and toughness and stamping formability, but also has high corrosion resistance.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a corrosion-resistant, high-strength and tough magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium-zinc-calcium alloy has good room temperature strength and plastic deformation ability, and zinc and calcium reserves are abundant, and the price is low, so magnesium-zinc-calcium alloy has good commercial application prospects. However, in magnesium-zinc-calcium alloys, Ca is usually formed 2 Mg 6 Zn 3 There is a large potential difference between the second phase and the magnesium alloy matrix, which leads to serious galvanic corrosion. In addition, the larger and more abundant Mg at the grain boundaries 2 The Ca phase also leads to rapid corrosion of the magnesium matrix. Therefore, improving the corrosion resistance of magnesium-zinc-calcium alloys is of great significance for its further application. At present, when alloying to improve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C1/03C22F1/06
CPCC22C1/03C22C23/04C22F1/06
Inventor 李美璇鞠虹王慧远王珵查敏王大为李佳声张凯孟昭元李宜家
Owner JILIN UNIV
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