CN101781729A - Magnesium-based wear-resistant damping alloy material and preparation method thereof - Google Patents

Abstract

The invention provides a magnesium-based wear-resistant damping vibration-reduction alloy material and a preparation method thereof. The alloy material improves the damping effect of the alloy by providing a stable lath compound in a matrix. The method has simple process, low production cost and is suitable for industrialized production. The alloy material uses a magnesium alloy as a matrix, and compound complexes are evenly distributed on the magnesium alloy matrix. The weight percentage of the chemical composition of the alloy material: Al is 5% to 9%, Sr is 2% to 4%, Sn 2%-3% for Fe, 0.5%-3% for Fe, 0.03-0.09% for C, 0.5%-1.5% for Dy, 1.1%-3% for Y, 0.5%-2% for La, and Mg for the rest.

Description

Magnesium-based wear-resistant damping vibration-damping alloy material and preparation method thereof

1. Technical field

The invention belongs to the field of metal materials, and relates to a magnesium-based damping alloy material and a preparation method thereof.

2. Technical background

At present, in the field of metal materials, magnesium alloys are widely used as wear-resistant damping and vibration-reducing materials.

Application No. CN200910023238.5 discloses a high-damping magnesium alloy containing quasi-crystalline reinforcement phase and its preparation method. The alloy composition and its weight percentage are: 0.9%-1.0% zinc, 0.15%-0.2% yttrium, 0.6% of zirconium. Magnesium and zinc are both industrial pure magnesium and industrial pure zinc; alloy elements yttrium and zirconium are added in the form of magnesium-30% yttrium and magnesium-30% zirconium master alloys respectively; through preheating, smelting and forming, a quasi-crystalline reinforcement is prepared Phase high damping magnesium alloy. However, the elements of this material are strictly controlled, and the improvement of the damping effect is limited only by the quasicrystalline reinforcement phase formed by limited yttrium.

Zhao Xu and other materials engineering journals published the study on the wear performance of magnesium alloy AZ31 in the fifth issue of 2008. The as-cast magnesium alloy AZ31 is composed of the matrix phase α2Mg and the second phase Mg17A112, the content of the second phase is small and distributed in the matrix in granular form. The wear mass loss of the specimen increases linearly with the wear time under different loads. In different load ranges, the change rate of wear mass loss is different, among which the rate of wear mass loss is lower in the range of 50-75N, and the rate of wear mass loss in the range of 75-100N is the largest. The increase of load makes the loss of wear mass more significant, and the wear form changes from oxidative wear to abrasive wear and then to spalling wear, and the wear becomes more and more serious. The wear resistance of ordinary magnesium alloy is not high.

3. Contents of the invention

The object of the present invention is to address the above-mentioned technical defects and provide a magnesium-based wear-resistant damping and vibration-damping alloy material. The alloy material improves the damping effect of the alloy by providing a stable lath compound in the matrix.

Another object of the present invention is to provide a preparation method of the above-mentioned magnesium-based wear-resistant damping and vibration-reduction alloy material, which has simple process, low production cost and is suitable for industrial production.

The purpose of the present invention is achieved through the following technical solutions:

A magnesium-based wear-resistant, damping and vibration-reducing alloy material. The alloy material uses a magnesium alloy as a matrix, and compound complexes are evenly distributed on the magnesium alloy matrix. The weight percentage of the chemical composition of the alloy material: Al is 5% to 9%, Sr 2%~4%, Sn 2%~3%, Fe 0.5%~3%, C 0.03-0.09%, Dy 0.5%~1.5%, Y 1.1%~3%, La is 0.5% to 2%, and the rest is Mg.

The preparation method of the above-mentioned magnesium-based wear-resistant damping vibration-reduction alloy material, its preparation process is as follows:

According to the total weight of raw materials, Al is 5% to 9%, Sr is 2% to 4%, Sn is 2% to 3%, Fe is 0.5% to 3%, C is 0.03-0.09%, and Dy is 0.5% to 1.5%, Y is 1.1%~3%, La is 0.5%~2%, and the rest is Mg for batching;

Put aluminum, strontium, tin, iron, magnesium, and carbon in the above-mentioned raw materials in a heating container protected by SF6 gas to melt to form magnesium, aluminum, strontium, carbon, tin, and iron alloy liquid; C is added in the form of carbon particles, and carbon particles The size is 0.1-1mm, Sr is added in the form of magnesium-strontium alloy, wherein the mass content of Sr is 25%, and the rest is added in the form of pure metal;

When the alloy liquid is heated to 710-725°C, press the prepared rare earth metals Y, Dy, and La into the alloy liquid with a bell jar. The corresponding castings can be cast in ~10 minutes; the formed castings are placed in a heat treatment furnace at 110-130° C. for 0.5-0.8 hours, and then taken out to obtain the required wear-resistant damping and vibration-reduction alloy.

The beneficial effects of the present invention compared with prior art are as follows:

In the magnesium-based wear-resistant damping and vibration-reduction alloy of the present invention, during the synthesis process of the material, iron and aluminum, tin and strontium, etc. react easily to form harmful and hard needle-like compounds, and the needle-like shape has a large splitting and destructive effect on the matrix, which seriously reduces the The mechanical properties of the alloy, the rare earth elements dysprosium, lanthanum and yttrium are surface active elements, which can interfere with the preferred growth of a certain phase during the solidification and growth of the compound, and inhibit the formation of needle-like compounds.

Yttrium can form compounds with tin and iron. Dysprosium can form compounds with aluminum and iron. The compounds formed by lanthanum, tin, and magnesium have strong affinity with tin-strontium compounds, magnesium-tin compounds, and iron-aluminum compounds, and can combine tin-strontium compounds, magnesium-tin compounds, and iron-aluminum compounds in the alloy to form short rods. Compound complex, distributed in a flexible matrix solid solution.

Dysprosium has the effect of refining solid solution grains. When the alloy is solidified, the rare earth, carbon, and aluminum form fine particles. These fine particles become the nucleation core of the solid solution and compound complex, increasing the number of solid solution and compound particles, increasing the dispersion of the compound complex, and promoting the compound. The complexes are evenly distributed.

In the magnesium matrix of the alloy material of the present invention, a large amount of group-like compound complexes are formed, and the hard tin-strontium compounds and iron-aluminum compounds in the compound complexes are interphase melted in magnesium-tin compounds and rare earth iron-silicon compounds with certain toughness. The hard compound complex is surrounded by ductile solid solution.

The interface formed between the short rod-shaped compound complex and the matrix and the interface formed by multiple compound phases inside the compound complex form several sources of internal friction. Therefore, the role of the rod-shaped rare earth compound complex is to effectively cut off the transmission of vibration, thereby greatly improving the vibration reduction of the alloy. Damping effect.

In the compound complex, the hard tin-strontium compound is surrounded by a compound with certain toughness, and the compound complex is surrounded by a tough solid solution. The tough compound complex that plays an anti-wear role should not be broken and peeled off in the friction with the partner. , the material has good wear resistance.

The properties of the alloy of the present invention are shown in Table 1.

The preparation process of the alloy is simple and convenient, the performance of the produced alloy material is good, and the production cost is low, which is very convenient for industrialized production.

4. Description of drawings

Fig. 1 is the metallographic structure of the wear-resistant damping and vibration-damping alloy prepared in Example 6 of the present invention. In the figure, the black area is the solid solution dendrite, and the white area is the rare earth compound complex.

5. Specific implementation

Embodiment one

According to the total weight of raw materials: Al is 5%, Sr is 2%, Sn is 2%, Fe is 0.5%, C is 0.03%, Dy is 0.5%, Y is 1.1%, La is 0.5%, and the rest is Mg. Ingredients;

Put aluminum, strontium, tin, iron, magnesium, and carbon in the above-mentioned raw materials in a heating container protected by SF6 gas to melt to form magnesium, aluminum, strontium, carbon, tin, and iron alloy liquid; C is added in the form of carbon particles, and carbon particles The size is 0.1-1mm, Sr is added in the form of magnesium-strontium alloy, wherein the mass content of Sr is 25%, and the rest is added in the form of pure metal;

When the alloy liquid is heated to 710-725°C, press the prepared rare earth metals Y, Dy, and La into the alloy liquid with a bell jar, in which the particle size of the rare earth metal is 1-3mm, and keep it warm for 5-10 minutes. Casting into corresponding castings; the formed castings are placed in a heat treatment furnace at 110-130° C. for 0.5-0.8 hours, and then taken out to obtain the required wear-resistant damping and vibration-reducing alloy.

Embodiment two

According to the total weight of raw materials: Al is 9%, Sr is 4%, Sn is 3%, Fe is 3%, C is 0.09%, Dy is 1.5%, Y is 3%, La is 2%, and the rest is Mg. Batching, its preparation process is with embodiment one.

Embodiment three

According to the total weight of raw materials: Al is 6%, Sr is 2.5%, Sn is 2.4%, Fe is 2%, C is 0.06%, Dy is 1%, Y is 2%, La is 1%, and the rest is Mg. Batching, its preparation process is with embodiment one.

Embodiment four (the example of unqualified alloy composition)

According to the total weight of raw materials: Al is 10%, Sr is 5%, Sn is 4%, Fe is 4%, C is 0.12%, Dy is 2%, Y is 3%, La is 2%, and the rest is Mg. Batching, its preparation process is with embodiment one.

Embodiment five (the example of unqualified alloy composition)

According to the total weight of raw materials: Al is 9%, Sr is 4%, Sn is 3%, Fe is 3%, C is 0.09%, Dy is 1.5%, Y is 4%, La is 3%, and the rest is Mg. Batching, its preparation process is with embodiment one.

It can be seen from Examples 4 and 5 that the composition of the alloy material is not in an appropriate range, and its wear resistance is obviously reduced.

Embodiment six

According to the total weight of raw materials: Al is 5%, Sr is 2%, Sn is 3%, Fe is 3%, C is 0.09%, Dy is 1.5%, Y is 1.1%, La is 0.5%, and the rest is Mg. Batching, its preparation process is with embodiment one. The metallographic structure of the prepared alloy material is shown in Fig. 1 .

Contrast alloys 1 and 2 in Table 1 are products of the prior art, and products 1 to 5 are alloy materials prepared by the method of the present invention, wherein the components of products 4 and 5 are not within the content range required by the design, for performance comparison.

Table 1:

Alloy No. Element Damping performance tanφ(1 Hz, amplitude 40μm) Wear mg (load 100N, wear time 100min) Comparative Alloy 1 Components in CN200910023238.5 application 0.0108-0.0121 Contrast Alloy 2 (Journal of Materials Engineering, Issue 5, 2008, Zhao Xu) AZ31 130 product one Each component is as embodiment one of the present invention 0.0121 8

Alloy No. Element Damping performance tanφ(1 Hz, amplitude 40μm) Wear mg (load 100N, wear time 100min) product two Each composition is as the second embodiment of the present invention 0.0127 5 product three Each component is as the third embodiment of the present invention 0.0124 6 product four The ingredients are as in Example 4 of the present invention 0.0126 108 product five Each composition is as embodiment five of the present invention 0.0122 82

It can be seen from the above table that the content of Al, Sr, Sn, Fe, C, La, Y, and Dy in the alloy increases within the scope of this case, and the damping performance improves; if the content of Al, Sr, Sn, Fe, C, La, Y, and Dy Beyond the scope of this case, the amount of rare earth compounds is too large to form a network, which will obviously reduce the mechanical properties of the material.

Claims (2)

1. magnesium-based wear-resistant damping alloy material, this alloy material is a matrix with the magnesium alloy, is uniform-distribution with the compound complex body on magnesium alloy substrate, and the following chemical components in percentage by weight of this alloy material: Al is 5%～9%, Sr is 2%～4%, Sn is 2%～3%, and Fe is 0.5%～3%, and C is 0.03-0.09%, Dy is 0.5%～1.5%, Y is 1.1%～3%, and La is 0.5%～2%, and all the other are Mg.

2. the preparation method of the described magnesium-based wear-resistant damping alloy material of claim 1, its preparation process is as follows:

Be 5%～9% by accounting for raw material gross weight Al respectively, Sr is 2%～4%, and Sn is 2%～3%, and Fe is 0.5%～3%, and C is 0.03-0.09%, and Dy is 0.5%～1.5%, and Y is 1.1%～3%, and La is 0.5%～2%, and all the other are prepared burden for Mg;

Aluminium, strontium, tin, iron, magnesium, carbon in the above-mentioned raw materials are placed formation magnesium, aluminium, strontium, carbon, tin, iron alloy liquid with fusing in the heating container of SF6 gas shield; C adds with the carbon granules form, and carbon granules is of a size of 0.1-1mm, and Sr adds with magnesium strontium alloy form, and wherein the mass content of Sr is 25%, and all the other add with form of pure metal;

When alloy liquid is heated to 710～725 ℃, rare earth metal y, Dy, the La for preparing is pressed into alloy liquid with bell jar, wherein the particle size of rare earth metal y, Dy, La is 1-3mm, is incubated 5～10 minutes, can be cast into corresponding foundry goods; The foundry goods that forms places 110-130 ℃ heat treatment furnace insulation after 0.5-0.8 hour, takes out and just obtains required wear-resistant damping alloy.

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