# US 12,215,409 B2 · High-strength and high-corrosion-resistant ternary magnesium alloy and preparation method thereof

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- Number: US 12,215,409 B2
- Document ID: US12215409B2
- Status: Granted
- Kind: B2
- Application number: 17/793,044
- Filed: 2021-03-15
- Published: 2023-03-02
- Granted: 2025-02-04
- Earliest claimed: 2020-03-19
- Assignees: Shanghai Jiao Tong University
- Applicants: Shanghai Jiao Tong University
- Inventors: Yangxin Li; Xiaoqin Zeng; Qingchun Zhu; Tao Ying
- Web page: https://patentgrep.com/patent/US12215409B2

## CPC

- C22C 1/03: using master alloys
- C22C 23/06: with a rare earth metal as the next major constituent
- C22F 1/002: {by rapid cooling or quenching; cooling agents used therefor}
- C22F 1/06: of magnesium or alloys based thereon
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)

## Abstract

The present invention relates to a high-strength, high-corrosion resistance ternary magnesium alloy and a preparation method therefor, the magnesium alloy comprising the following element components by mass percentage: 8-12 wt % of Y, 0.6-3 wt % of Al and the remainder being Mg. The method comprises: (1) under a protective atmosphere, preparing a Mg—Y intermediate alloy, an aluminum ingot and a magnesium ingot into a magnesium alloy melt; (2) under a protective atmosphere, allowing the magnesium alloy melt to stand after stirring, then carrying out refining, degassing, and slag removal, allowing the magnesium alloy melt to stand again, then thermally insulating to obtain a magnesium alloy liquid; and (3) casting and molding the magnesium alloy liquid under a protective atmosphere, and forming a cast ingot; the three steps above ultimately obtain a high-strength, high-corrosion resistance ternary magnesium alloy.

## Claims

### Claim 1

A preparation method of a high-strength and high-corrosion-resistant ternary magnesium alloy, the method comprising the following steps:
(1) under a protective atmosphere, preparing a magnesium alloy melt from an Mg—Y master alloy, an aluminum ingot and a magnesium ingot;
(2) under the protective atmosphere, stirring the magnesium alloy melt, holding at 720-740° C. for 20-60 min, then performing refined degassing and deslagging at 730-750° C., holding again at 720-740° C., and performing heat preservation at 720-740° C. for 20-60 min to obtain a magnesium alloy liquid; and
(3) under the protective atmosphere, casting the magnesium alloy liquid into a mold to form an ingot, and finally obtaining the corrosion-resistant ternary magnesium alloy,
wherein the corrosion-resistant ternary magnesium alloy includes the following elements in percentage by weight: 8-12 wt % of Y, 0.6-3 wt % of Al, and the balance of Mg, and
wherein the corrosion-resistant ternary magnesium alloy includes a lath-shaped LPSO phase and Al2Y particles,
wherein the ingot is solution-treated to obtain the corrosion-resistant ternary magnesium alloy,
wherein a temperature of the solution treatment is 500-580° C., a time of the solution treatment is 8-24 h.

### Claim 2 (depends on 1)

The preparation method of the high-strength and high-corrosion-resistant ternary magnesium alloy according to claim 1, wherein preparing the magnesium alloy melt comprises the following specific steps: under the protective atmosphere, after the magnesium ingot is melted, adding the Mg—Y master alloy and the aluminum ingot at 660-700° C., and after the Mg—Y master alloy and the aluminum ingot are melted, obtaining the magnesium alloy melt.

### Claim 3 (depends on 2)

The preparation method of the high-strength and high-corrosion-resistant ternary magnesium alloy according to claim 2, wherein a protective gas is a mixed gas of SF6 and CO2.

### Claim 4 (depends on 1)

The preparation method of the high-strength and high-corrosion-resistant ternary magnesium alloy according to claim 1, wherein the ingot is solution-treated, and then is extruded and water-quenched to obtain the corrosion-resistant ternary magnesium alloy.

### Claim 5 (depends on 4)

The preparation method of the high-strength and high-corrosion-resistant ternary magnesium alloy according to claim 4, wherein a temperature of extrusion is 300-450° C., an extrusion ratio is (9-30):1, and an outflow speed of an extruded section is 3-10 m/min.

### Claim 6 (depends on 1)

The preparation method of the high-strength and high-corrosion-resistant ternary magnesium alloy according to claim 1, wherein a protective gas is a mixed gas of SF6 and CO2.