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Novel low-expansion binary magnesium alloy and preparation method thereof

A magnesium alloy and low-expansion technology, which is applied in the field of new low-expansion binary magnesium alloy and its preparation, can solve the problems of high cost and brittle second equivalence, and achieve the effects of low cost, low thermal expansion coefficient and simple equipment

Active Publication Date: 2022-06-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to provide a novel low-expansion binary magnesium alloy and its preparation method, and solve the problem that the existing magnesium alloy still has a brittle second phase while reducing the coefficient of expansion. , There are many phase interfaces with the matrix and high cost problems

Method used

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  • Novel low-expansion binary magnesium alloy and preparation method thereof
  • Novel low-expansion binary magnesium alloy and preparation method thereof
  • Novel low-expansion binary magnesium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] 1) A binary Mg-Gd low-expansion magnesium alloy material, wherein the content of Gd element is about 1.6wt.%, and the rest are Mg and inevitable impurity elements. Prepare materials according to the above-mentioned components and polish the raw materials to give a metallic luster. The amount is ready for use, and the raw materials used are high-purity Mg (99.99wt.%) and Mg-30wt.%Gd master alloy.

[0035]2) Put the weighed raw materials into the heat treatment furnace for preheating, the preheating temperature is 250 ℃, then put the preheated pure magnesium into the resistance furnace, the melting temperature is set to 730 ℃, in a dynamic protective atmosphere CO 2 with SF 6 Heating under mixed gas (with a ratio of 99:1), after melting, the preheated Mg-30wt.% Gd master alloy is put in, and the temperature is kept for 15-20 minutes to form an alloy melt.

[0036] 3) The magnesium alloy melt obtained in step 2) was stirred for 2 minutes, kept at 730° C. for 10 minutes, ...

Embodiment 2

[0040] 1) A binary Mg-Gd low-expansion magnesium alloy material, wherein the content of Gd element is about 4.2wt.%, and the rest are Mg and inevitable impurity elements. Prepare materials according to the above-mentioned components and polish the raw materials to give a metallic luster. The amount is ready for use, and the raw materials used are high-purity Mg (99.99wt.%) and Mg-30wt.%Gd master alloy.

[0041] 2) Put the weighed raw materials into the heat treatment furnace for preheating, the preheating temperature is 250 ℃, then put the preheated pure magnesium into the resistance furnace, the melting temperature is set to 730 ℃, in a dynamic protective atmosphere CO 2 with SF 6 Heating under mixed gas (with a ratio of 99:1), after melting, the preheated Mg-30wt.% Gd master alloy is put in, and the temperature is kept for 15-20 minutes to form an alloy melt.

[0042] 3) The magnesium alloy melt obtained in step 2) was stirred for 2 minutes, kept at 730° C. for 10 minutes,...

Embodiment 3

[0046] 1) A binary Mg-Gd low-expansion magnesium alloy material, wherein the content of Gd element is about 10.6wt.%, and the rest are Mg and inevitable impurity elements. Prepare materials according to the above-mentioned components and polish the raw materials to give a metallic luster. The amount is ready for use, and the raw materials used are high-purity Mg (99.99wt.%) and Mg-30wt.%Gd master alloy.

[0047] 2) Put the weighed raw materials into the heat treatment furnace for preheating, the preheating temperature is 250 ℃, then put the preheated pure magnesium into the resistance furnace, the melting temperature is set to 730 ℃, in a dynamic protective atmosphere CO 2 with SF 6 Heating under mixed gas (with a ratio of 99:1), after melting, the preheated Mg-30wt.% Gd master alloy is put in, and the temperature is kept for 15-20 minutes to form an alloy melt.

[0048] 3) The magnesium alloy melt obtained in step 2) was stirred for 2 minutes, kept at 730° C. for 10 minutes...

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Abstract

The invention discloses a novel low-expansion binary magnesium alloy and a preparation method thereof, the magnesium alloy comprises the following components in percentage by mass: 1.6-15.5% of Gd and the balance of magnesium and inevitable impurity elements, and the thermal expansion coefficient of the magnesium alloy at room temperature is 15.7 * 10 <-6 > K <-1 >-16.4 * 10 <-6 > K <-1 >. By adopting the mode of combining accurate control of the content of the Gd element and the solution treatment process, the content of a second phase in the alloy is greatly reduced, meanwhile, a large number of phase interfaces are prevented from being generated with a magnesium matrix, and the thermal expansion coefficient of the magnesium alloy is effectively reduced. The Mg-Gd alloy not only has a low thermal expansion coefficient, but also has good plastic processing performance, the potential of the Mg-Gd alloy serving as a repair welding material or an electronic element material is greatly improved, the engineering field where magnesium alloy can be applied is expanded, meanwhile, a new research direction is provided for research on preparation of low-expansion magnesium alloy, and the Mg-Gd alloy has great significance.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy casting preparation, in particular to a novel low-expansion binary magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloys are considered to be a promising structural application due to their high specific strength, low density, good castability, and good recyclability. Magnesium alloys are rich in resources and have significant lightweight effects. Their large-scale application plays an important role in energy conservation and emission reduction and alleviating resource shortages in my country. Therefore, they are widely used in ground transportation, aerospace, and 3C electronics. [0003] However, pure magnesium has a higher coefficient of thermal expansion (CTE) at room temperature, about 26 × 10 -6 K -1 , resulting in large casting thermal stress, resulting in a large number of casting defects such as shrinkage porosity, shrinkage cavities a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/06
Inventor 蒋斌王翠红宋江凤董志华吴素娟钱晓英郑志莹李旭潘复生
Owner CHONGQING UNIV
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