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A kind of high-performance mg-y-mn-gd deformed magnesium alloy and its preparation method

A mg-y-mn-gd, wrought magnesium alloy technology, applied in the field of magnesium alloys, can solve the problems of low mechanical properties, high cost of heavy rare earth magnesium alloys, complicated preparation processes, etc., and achieve the effect of low Gd content

Active Publication Date: 2019-01-11
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide a deformed magnesium alloy composed of Mg-Y-Mn-Gd elements and a preparation method thereof, so as to solve the problem of relatively low mechanical properties of rare earth-containing magnesium alloys in the prior art. Magnesium alloys low or containing a large amount of heavy rare earths have high cost, high density, and complicated preparation process. The magnesium alloy is processed by a two-stage aging heat treatment process after extrusion deformation, which has both high strength and high plasticity, and has obtained Excellent comprehensive mechanical properties

Method used

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  • A kind of high-performance mg-y-mn-gd deformed magnesium alloy and its preparation method
  • A kind of high-performance mg-y-mn-gd deformed magnesium alloy and its preparation method
  • A kind of high-performance mg-y-mn-gd deformed magnesium alloy and its preparation method

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Embodiment 1

[0042] The composition (mass percentage) of the deformed alloy is: Y 8.0%, Mn 0.4%, Gd 0.3%; the rest is magnesium and unavoidable impurities.

[0043] According to the composition ratio of Example 1, the deformed magnesium alloy of the present invention is obtained by the following preparation method:

[0044] (1) Alloy smelting and casting: first preheat pure Mg, Mg-Y master alloy, Mg-Mn master alloy and Mg-Gd master alloy at 150°C for 30min; 2 and SF 6 Heat pure magnesium in a resistance furnace protected by mixed gas, keep warm at 700°C to melt the masterbatch, then add preheated Mg-Y master alloy, Mg-Mn master alloy and Mg-Gd master alloy, and heat up to 730°C Keep it warm for 30 minutes, wait until the alloying elements are completely melted, stir evenly, let it stand for 20 minutes, then cool down to 690°C, in CO 2 and SF 6 Cast into ingots under the protection of mixed gas; CO 2 and SF 6 In the mixed gas, by volume percentage, CO 2 Accounting for 99~99.5%, SF 6 ...

Embodiment 2

[0048] The composition (mass percentage) of the deformed magnesium alloy is: Y 10.0%, Mn 0.4%, Gd 0.3%; the rest is magnesium and unavoidable impurities.

[0049] According to the composition ratio of Example 2, the deformed magnesium alloy of the present invention is obtained by the following preparation method:

[0050] (1) Alloy smelting and casting: first preheat pure Mg, Mg-Y master alloy, Mg-Mn master alloy and Mg-Gd master alloy at 180°C for 25min; 2 and SF 6 Heat pure magnesium in a resistance furnace protected by mixed gas, keep warm at 720°C to melt the masterbatch, then add the preheated Mg-Y master alloy, Mg-Mn master alloy and Mg-Gd master alloy, and heat up to 740°C Keep warm for 25 minutes, wait until the alloying elements are completely melted, stir evenly, let stand for 20 minutes, then cool down to 700°C, in CO 2 and SF 6 Cast into ingots under the protection of mixed gas; CO 2 and SF 6 In the mixed gas, by volume percentage, CO 2 Accounting for 99~99.5...

Embodiment 3

[0054] The composition (mass percentage) of the deformed magnesium alloy is: Y 12.0%, Mn 0.4%, Gd 0.3%; the rest is magnesium and unavoidable impurities.

[0055] According to the composition ratio of Example 3, the deformed magnesium alloy of the present invention is obtained by the following preparation method:

[0056] (1) Alloy smelting and casting: first preheat pure Mg, Mg-Y master alloy, Mg-Mn master alloy and Mg-Gd master alloy at 200°C for 20min; 2 and SF 6 Heat pure magnesium in a resistance furnace protected by mixed gas, keep warm at 710°C to melt the masterbatch, then add the preheated Mg-Y master alloy, Mg-Mn master alloy and Mg-Gd master alloy, and heat up to 750°C Keep warm for 20 minutes, wait until the alloying elements are completely melted, stir evenly, let stand for 20 minutes, then cool down to 710°C, in CO 2 and SF 6 Cast into ingots under the protection of mixed gas; CO 2 and SF 6 In the mixed gas, by volume percentage, CO 2 Accounting for 99~99.5...

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Abstract

The invention relates to the field of magnesium alloys, in particular to a high-performance Mg-Y-Mn-Gd deformed magnesium alloy and a preparation method thereof. The magnesium alloy is prepared from the following elements in percentage by mass: 8.0-12.0% of Y, 0.3-0.5% of Mn, 0.2-0.4% of Gd and the balance of magnesium and inevitable impurities. The high-performance Mg-Y-Mn-Gd deformed magnesium alloy adopts industrial pure magnesium ingot, Mg-Y intermediate alloy, Mg-Mn intermediate alloy and Mg-Gd intermediate alloy as raw materials, and the raw materials are subjected to alloy smelting and casting, alloy extrusion processing and double-stage ageing thermal treatment of extruded materials to obtain the magnesium alloy. The magnesium alloy has good extrusion properties and forming properties, can obtain excellent plasticity under an extrusion-state condition, and can obtain high strength after ageing treatment; the preparation method is simple in preparation process, and is low in preparation cost; the prepared deformed magnesium alloy has high strength and high plasticity, so that the problems that the magnesium alloy not containing rare earth is relatively low in mechanical property or the magnesium alloy containing a great deal of rare earth is relatively high in cost and is relatively great in density in the prior art are solved.

Description

technical field [0001] The invention relates to the field of magnesium alloys, in particular to a high-performance Mg-Y-Mn-Gd series deformed magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of light weight, shock absorption, good electromagnetic shielding performance, and excellent machinability. It has important application value and broad application prospects in aerospace, electronic products, automobiles and other industries. However, magnesium alloys have a typical hexagonal close-packed structure, and there is only a single basal slip system when deformed at room temperature, resulting in poor deformability of magnesium alloys, which severely limits the application of magnesium alloys. At present, the most widely used wrought magnesium alloys are mainly AZ, ZK, and AM series. The strength of these magnesium alloys is generally low, and the mechanical properties cannot meet the industrial needs. Therefo...

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 周吉学唐守秋马百常王金伟吴建华王世芳王美芳刘运腾林涛
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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