A kind of sc-containing high-strength high-toughness magnesium alloy and preparation method thereof

A high-strength, high-toughness, magnesium alloy technology, applied in the field of high-strength, high-toughness magnesium alloys and their preparation, can solve problems such as the inability to increase the distribution density at will, material ductile plastic failure, and the tendency of alloy thermal cracking, etc., to achieve excellent room temperature and high temperature mechanics Performance, plastic index improvement, room temperature mechanical properties improvement effect

Active Publication Date: 2020-08-25
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in the Mg-Y-Nd-Zr alloy, due to the destruction of the toughness and plasticity of the material due to the precipitation of the strengthening phase, its distribution density in the matrix cannot be increased arbitrarily, and it also leads to a greater tendency of the alloy to be hot cracked, which limits the development of the alloy. Further development

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  • A kind of sc-containing high-strength high-toughness magnesium alloy and preparation method thereof
  • A kind of sc-containing high-strength high-toughness magnesium alloy and preparation method thereof

Examples

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preparation example Construction

[0050] The present invention also provides a method for preparing a Sc-containing high-strength and high-toughness magnesium alloy, comprising the following steps:

[0051] A) batching pure Mg, Mg-Zr master alloy, Mg-Sc master alloy and Mg-RE master alloy according to the following mass fractions, melting and casting;

[0052] RE = Y, Nd and Gd;

[0053] Y: 4.5~6.5wt%, Nd: 1.5~4.0wt%, Gd: 1.5~4.0wt%, Sc: 0.05~0.5wt%, Zr: 0.15~1.5wt%, the balance is Mg, of which the total amount of rare earth elements Not more than 10wt%

[0054]B) heat-treating or extruding the casting to obtain a high-strength and high-toughness magnesium alloy containing Sc.

[0055] In the present invention, the pure Mg, the Mg-Zr master alloy, the Mg-Sc master alloy and the Mg-RE master alloy are preferably proportioned and then dried. The drying temperature is 100-200° C. and the drying time is 1-2 hours;

[0056] (2) Put the dried pure Mg and Mg-RE master alloy into the crucible and raise the temperat...

Embodiment 1

[0077] The high-strength heat-resistant magnesium alloy in this embodiment is composed of the following components by mass percentage: Y: 4.5wt.%, Nd: 1.5wt%, Gd: 1.5wt%, Sc: 0.05wt%, Zr: 0.5wt%, and The amount is Mg and unavoidable impurities.

[0078] The casting molding preparation of the high-strength heat-resistant magnesium alloy of this embodiment comprises the following steps:

[0079] (1) Align the raw material pure Mg, Mg-Zr master alloy, Mg-RE master alloy, and Mg-Sc master alloy in proportion, and then dry them. The drying temperature is 100-200°C, and the drying time is 1-2 hours. .

[0080] (2) During the preparation process, the melt has been in CO 2 and SF 6 Under the protection of mixed gas, CO 2 with SF 6 The ratio is 99.5:0.5.

[0081] (3) Put the dried pure Mg and Mg-RE master alloy into the crucible and raise the temperature with the furnace until it is completely melted, and the temperature is controlled at 780°C.

[0082] (4) Cool the melt down to...

Embodiment 2

[0088] The difference between Example 2 and Example 1 is that the high-strength heat-resistant magnesium alloy is composed of the following components by mass percentage: Y: 6.5wt.%, Nd: 1.5wt%, Gd: 1.5wt%, Sc: 0.1wt% , Zr: 0.5wt%, and the balance is Mg and unavoidable impurities.

[0089] Solution treatment: heat-treat the casting at 510°C for 12h, then air-cool to room temperature. Aging treatment: heat-treat the casting at 225°C for 48 hours, then air-cool to room temperature.

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Abstract

The invention provides a high-strength and high-toughness magnesium alloy containing Sc, which comprises the following components in mass fraction: Y: 4.5-6.5 wt%, Nd: 1.5-4.0 wt%, Gd: 1.5-4.0 wt%, Sc: 0.05 ~0.5wt%, Zr: 0.15~1.5wt%, the balance is Mg, wherein the total amount of rare earth elements does not exceed 10wt%. The high-strength and high-toughness magnesium alloy component in the present invention is Mg-Y-Nd-Gd-Sc-Zr, with the precipitation strengthening of rare earth-containing intermetallic compounds as the main strengthening mechanism, and by adding non-rare earth element Sc to improve the material of the present invention The nucleation density during solidification significantly refines the alloy structure. The material of the invention has excellent mechanical properties at room temperature and high temperature, and has higher plasticity among similar materials. The invention also provides a preparation method of the Sc-containing high-strength and high-toughness magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a high-strength and high-toughness magnesium alloy containing Sc and a preparation method thereof. Background technique [0002] In the field of magnesium alloy research, aging precipitation strengthening is an important direction for the development of high-strength magnesium alloys. The Mg-Y-Nd-Zr alloy system based on this principle has good room temperature and high temperature strength. However, in the Mg-Y-Nd-Zr alloy, due to the destruction of the toughness and plasticity of the material due to the precipitation of the strengthening phase, its distribution density in the matrix cannot be increased arbitrarily, and it also leads to a greater tendency of the alloy to be hot cracked, which limits the development of the alloy. Further development. [0003] Therefore, on the basis of ensuring the high strength and high heat resistance of the alloy material and not redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/06
Inventor 孟健田政管凯杨强张德平孙伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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