CN104152773A

CN104152773A - High-damping Mg-Zn-Y alloy and preparation technique thereof

Info

Publication number: CN104152773A
Application number: CN201410376527.4A
Authority: CN
Inventors: 王敬丰; 鲁若鹏; 秦德昭; 吴忠山; 杨文翔
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2014-08-01
Filing date: 2014-08-01
Publication date: 2014-11-19
Anticipated expiration: 2034-08-01
Also published as: CN104152773B

Abstract

The invention discloses a high-damping Mg-Zn-Y alloy containing rare-earth yttrium and a manufacturing method thereof. The magnesium alloy is composed of the following components in percentage by weight: 4.0-4.8% of Y, 6.6-8.9% of Zn, and the balance of magnesium and inevitable impurities. By designing the Zn and Y contents according to the synthesis components, the alloy is mainly a two-phase alloy composed of a magnesium phase and a long-period phase, wherein the long-period phase is an effective strengthening phase in the magnesium alloy and is beneficial to the damping capacity of the alloy. The alloy composition control and smelting techniques are adopted to control the grain size and long-period phase (LPSO) distribution in the alloy, thereby greatly enhancing the damping capacity of the alloy, ensuring the alloy strength and implementing the balanced optimization of damping and mechanical properties of the magnesium alloy. The technique is simple and easy to operate, has the advantages of high transferability and lower cost, and can be used for aerospace, track traffic and textile technology to achieve the effects of damping and noise reduction.

Description

High damping Mg-Zn-Y alloy and preparation technology thereof

Technical field

The present invention relates to a kind of metallic substance, particularly a kind of high damping Mg-Zn-Y alloy and preparation technology thereof.

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Background technology

Increasingly lightweight, high speed and the high-power of modern weapons equipment Development, it is particularly outstanding that the vibration causing thus and noise problem become.In addition, the various vehicles, 3C Product (Computer, Communication, Consumption Electronics Products) have proposed more urgent requirement to structure lightweight and vibration and noise reducing.Therefore, low density, high specific strength, high-damping metal structured material are one of materials demands urgent in aerospace, new-type weapon and equipment and development of modern industry.Magnesium is the lightest commercial structural metallic materials, meets light-weighted demand, and magnesium is also the best metallic substance of damping capacity simultaneously, meets the demand of vibration and noise reducing.Pure magnesium damping capacity good (than ratio of damping >60%), but intensity is too low.And magnesium alloy (Mg-Al-Zn, Mg-Zn-Zr, Mg-RE-Zr) strengthening mechanism is mainly solution strengthening, precipitation strength etc., but solute atoms and precipitated phase cause damping capacity greatly to reduce (than ratio of damping 5 ~ 10%) to the strong pinning of magnesium basal plane dislocation slippage.The contradiction solving between magnesium alloy damping performance and mechanical property is a major issue urgently to be resolved hurrily.

Japanese scholars mentions at " Plastic Deformation Behavior of Mg97Zn1Y2 Extruded Alloys " (58 (2010) 6282 – 6293.) literary composition the mechanical property that LPSO is conducive to alloy mutually, have obvious strengthening effect, this also can find out that the introducing of long period phase can be conducive to solve the contradiction between magnesium alloy damping performance and mechanical property.On the other hand, research also shows that long period is a kind of very stable phase composition mutually, and conventional thermal treatment is difficult to it to regulate and control.

" the high-strength Mg-Cu-Mn-Zn-Y of high damping " alloy is disclosed in CN 101805864 B, it adds Zn and Y element in Mg-Cu-Mn alloy, make Mg, Zn, Y in alloy, form accurate crystalline substance and/or long period phase, these accurate crystalline substances or long period are met and in magnesium matrix, are introduced a large amount of new mobile dislocations, and the mobile dislocation newly increasing in magnesium matrix by these improves the damping capacity of magnesium alloy.This alloy over-all properties is comparatively excellent, but after deformation process, and more due to solid solution atom, second-phase, crystal grain is less, and damping capacity does not also reach a gratifying degree.

At present, demand is a kind of can contain the technique of long period phase alloy by Effective Regulation, and prepares Novel high-damping magnesium alloy to meet the demand to vibration and noise reducing such as current defence and military and civilian industry.

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Summary of the invention

For prior art above shortcomings, the object of this invention is to provide a kind of high damping Mg-Zn-Y alloy, ensureing, under the condition of certain intensity, significantly to improve damping capacity, to meet current national defence and the demand of civilian technique to vibration and noise reducing.

Further, the present invention also provides the preparation technology of described high damping Mg-Zn-Y alloy.

Realize above-mentioned purpose, the present invention adopts following technical scheme: a kind of high damping Mg-Zn-Y alloy, it is characterized in that, this magnesium alloy is elementary composition by Mg, Zn, tri-kinds of Y, main phase composition is the duplex alloy of Mg and long period phase, its each composition weight percent is: Zn=4.0～4.8, and Y=6.0～9.0, surplus is magnesium and inevitable impurity.

Further, this magnesium alloy is elementary composition by Mg, Zn, tri-kinds of Y, and it respectively forms weight percent and is: Y=8.2, Zn=4.6; Its shape characteristic is: mainly by magnesium phase and long period phase composite, alloy grain size is ~ 100 μ m, and grain boundaries is block long period phase, and intracrystalline is lamellar long period phase.

A kind of preparation technology of high damping Mg-Zn-Y alloy, comprise step 1, adopt described formula reinforced, and be warming up to 800 ~ 820 DEG C insulation and electromagnetic induction stir raw material is fully melted, all after fusing, continue to leave standstill insulation 10 ~ 20 minutes at 760 ~ 780 DEG C until alloy, cast and obtain alloy cast ingot;

Step 2, alloy ingot casting carries out secondary smelting, and (1) is warming up to 800 ~ 820 DEG C of region insulation 2 ~ 4h; (2) after melting completely, be incubated 1 ~ 2h in thermograde in 620 ~ 660 DEG C of regions, sample is placed in room temperature air cooling by (3).

Further, (3) described in step 2 are to be first 400 ~ 450 DEG C of region insulation 8 ~ 12h in thermograde, then sample is placed in to room temperature air cooling.

Compared to existing technology, the present invention has following beneficial effect:

1, the present invention controls the atomic ratio of Y/Zn in the design of synthetic ingredient, definitely in alloy Y and Zn mainly form long period phase, alloy is the main duplex alloy by magnesium phase and long period phase composite, long period is effective strengthening phase in magnesium alloy mutually, be conducive to the mechanical property of magnesium alloy, avoid too much phase composition to hinder dislocation motion and reduce alloy damping characteristic simultaneously.

2, common, numerous scholars are mainly devoted to improve by single heat treatment mode the research of alloy damping characteristic, and long period is very stable, and conventional thermal treatment is difficult to it to regulate and control.In Mg-Zn-Y of the present invention, Zn, Y proportion are larger, adopt electromagnetic induction melting once, allow uniform ingredients; Remelting just do not have obvious segregation in soak again; By remelting and heat treatment phase combination, be incubated at specified temp, reach the object that improves damping capacity.

3, in preparation technology of the present invention, adopt by controlling alloying constituent and melting technology, control grain size and long period phase (LPSO) distribution in alloy, can significantly carry heavy alloyed damping capacity.Can be hard layer sheet long period phase by Y, Zn cycling of elements in matrix, alloy has obvious second-phase strengthening left and right, is conducive to alloy damping, and in the time of vibration, a large amount of two-phase interfaces can reach good effectiveness in vibration suppression simultaneously.

4, technique of the present invention is simple, and test parameter control is convenient, portable strong, and easily operation, cost is lower, can be used for aerospace, track traffic, textile technology, reach the effect of vibration and noise reducing, can reach raising Mg-Zn-Y is the object of alloy damping characteristic.

Brief description of the drawings

Fig. 1 is the microtexture photo for as-cast magnesium alloy.

Fig. 2 is the microtexture photo that obtains high damping alloy for embodiment 1.

Fig. 3 is the microtexture photo that obtains high damping alloy for embodiment 2.

Fig. 4 is the damping test result for magnesium alloy.

Embodiment

Below in conjunction with specific embodiments and the drawings, the present invention is described in further detail.

embodiment 1:a kind of high damping Mg-Zn-Y two phase alloys and preparation technology thereof, alloying constituent (weight percent): Y-6.6%, Zn-4.2%, impurity element little Yu 0.1%, all the other are Mg.

The manufacture method of this high damping Mg-Zn-Y alloy, carry out as follows:

Step 1: in vacuum melting furnace, and pass into argon gas protection, according to weight percent Y=6.6%, Zn=4.2% adds alloying element.Wherein, Y, Zn adds with Mg-30Y master alloy and pure Zn form respectively.Under 820 DEG C of conditions, insulation electromagnetic induction stir raw material are fully melted, and all after fusing, continue to leave standstill insulation 15 minutes at 780 DEG C until alloy, then cast.

Step 2: by ingot casting sanding and polishing, alloy ingot casting carries out secondary smelting, is warming up to 820 DEG C of region insulation 3h; After melting completely, be incubated 1h in thermograde in 650 DEG C of regions; Finally, then by sample be placed in room temperature air cooling.

Obtain the microtexture photo of high damping alloy as shown in Figure 2.

embodiment 2:a kind of high damping Mg-Zn-Y alloy and preparation technology thereof, alloying constituent (weight percent):

Y-7.5%, Zn-4.6% impurity element little Yu 0.1%, all the other are Mg.

Step 2: by ingot casting sanding and polishing, alloy ingot casting carries out secondary smelting, is warming up to 820 DEG C of region insulation 3h; After melting completely, be incubated 1h in thermograde in 650 DEG C of regions; Be then 400 DEG C of region insulation 10h in temperature; Again sample is placed in to room temperature air cooling.

Obtain the microtexture photo of high damping alloy as shown in Figure 3.

Fig. 4 is the damping test result of magnesium alloy.

Table 1 is feature and mechanics and the damping capacity of high damping Mg-Zn-Y alloy described in embodiment 1-2

Example

Zn

Y

Mg

Impurity

Shape characteristic

Tensile strength

Damping capacity

Embodiment 1

4.2

6.6

Surplus

0.1

Crystal grain 100 μ m, grain boundaries is mainly block long period phase

180Mpa

0.073

Embodiment 2

4.2

6.6

Surplus

0.1

Crystal grain 100 μ m left and right; Grain boundaries is mainly block long period phase; A large amount of lamellar long period phases are contained in inside

165MPa

0.109

Can find out according to table 1 and Fig. 4, this design mix, through melting again and in specific stable insulation, has changed the pattern of alloy, the damping that has significantly improved alloy.Embodiment 2 and embodiment 1 are, finally alloy are placed in to 400 DEG C of insulation 10h, and a large amount of lamellar second-phases have been separated out in inside, and the damping of alloy is further largely increased.Its damping capacity in the time that strain is 10-3 up to the standard of 0.109(superelevation damping alloy far away, Q-1>0.01).Simultaneously also visible alloy simultaneously, is also keeping certain intensity at high damping properties definitely.

Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.

Claims

1. high damping Mg-Zn-Y alloy, is characterized in that, this magnesium alloy is elementary composition by Mg, Zn, tri-kinds of Y, main phase composition is the duplex alloy of Mg and long period phase, its each composition weight percent is: Zn=4.0～4.8, and Y=6.0～9.0, surplus is magnesium and inevitable impurity.

2. high damping Mg-Zn-Y alloy according to claim 1, is characterized in that, this magnesium alloy is elementary composition by Mg, Zn, tri-kinds of Y, and it respectively forms weight percent and is: Y=8.2, Zn=4.6; Its shape characteristic is: mainly by magnesium phase and long period phase composite, alloy grain size is ~ 100 μ m, and grain boundaries is block long period phase, and intracrystalline is lamellar long period phase.

3. a preparation technology for high damping Mg-Zn-Y alloy, is characterized in that, comprises the following steps:

Step 1, adopts described in claim 1 formula reinforced, and is warming up at 800 ~ 820 DEG C of insulations electromagnetic induction and stirs raw material is fully melted, and all after fusing, continues to leave standstill insulation 10 ~ 20 minutes at 760 ~ 780 DEG C the acquisition alloy cast ingot of cast until alloy;

4. the preparation technology of high damping Mg-Zn-Y alloy according to claim 3, is characterized in that, (3) described in step 2 are to be first 400 ~ 450 DEG C of regions insulation 8 ~ 12h in thermograde, then sample is placed in to room temperature air cooling.