CN102644040A - Heat treatment process for improving electromagnetic shielding performance of high-strength wrought magnesium alloy - Google Patents
Heat treatment process for improving electromagnetic shielding performance of high-strength wrought magnesium alloy Download PDFInfo
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Abstract
The invention provides a heat treatment process for improving the electromagnetic shielding performance of high-strength wrought magnesium alloy, which comprises the steps of: carrying out solution treatment on a magnesium alloy board treated by extrusion plastic deformation at 380-420 DEG C, and carrying out heat preservation for 4-6 hours; carrying out water quenching till room temperature is achieved; then, heating up to 130-190 DEG C for aging, carrying out heat preservation for 4-50 hours, and cooling to the room temperature by air; and directly heating the magnesium alloy board up to 130-200 DEG C for aging, carrying out heat preservation for 4-90 hours, and cooling to the room temperature by air. The process provided by the invention can remarkably improve the electromagnetic shielding performance of the high-strength wrought magnesium alloy when guaranteeing good mechanical property. After being treated by the heat treatment technology, the wrought magnesium alloy is wide in application scope and can meet the actual demand of fields such as 3C (computer, communication and consumer electronic) products, aerospace, national defense military industry and the like; furthermore, the heat treatment technology is simple in equipment, lower in cost and easy to operate.
Description
Technical field
The present invention relates to a kind of thermal treatment process of deformed magnesium alloy material, particularly improve the heat-treatment technology method of high-strength wrought magnesium alloys capability of electromagnetic shielding.
Background technology
Along with the development of electronic industry and the height of electronics are used, the EMI that electromagnetic radiation causes not only influences people's orthobiosis, and threatens the information security and the military secrecy of country day by day.Especially on the modernized battlefield that ECM upgrades gradually, during the susceptible device susceptor of the various military equipments of electromagnetic waves, possibly cause weapons such as the paralysis of the other side's radio communication command system, radar are vast and hazy, guided missile cannon out of control.In addition, people are also given in electromagnetic radiation has healthyly brought stern challenge, like nervous function disorder, compromised immune, endocrine system function reduction etc.Therefore, electromagnetic radiation shielding disturbs and not only can improve stability, the security of electronics, electric equipment operation to greatest extent, but also can alleviate the electromagnetic pollution to human habitat.
Shielding material is the important means of electromagnetic radiation protection, and existing shielding material mainly is metallic substance and matrix material.Yet all there is certain limitation in some aspects in these two types of materials, and are bigger like metallic substance (Cu, Fe, Ni and alloy thereof) density; Not high enough and the shielding less stable of the mechanical property of matrix material and capability of electromagnetic shielding.Compare with above-mentioned two types of materials; Magnesiumalloy has that density is low, specific tenacity is high, conduction and magnetic property well, need not do too many complex processing, just can obtain shielding properties preferably to satisfy the demand of fields such as electronics, communication, aerospace and national defense and military industry to lightweight, energy-conservation and radioprotective etc.Therefore, magnesium and magnesiumalloy are the potential shielding materials of a kind of ten minutes, and developing magnesiumalloy high-strength, high shielding is the important directions that shielding material is developed.
Yet, find that according to early-stage Study of the present invention the effectiveness of shielding of high-strength magnesium alloy is not high, this is can influence the conductivity of magnesiumalloy owing to add more alloying element, thereby reduces its shielding properties.Therefore, it is very important to improve the capability of electromagnetic shielding of high-strength magnesium alloy.At present, suitable thermal treatment process can increase substantially magnesium alloy strength, and in view of this, applicant of the present invention considers to start with from high-strength wrought magnesium alloys, improves its capability of electromagnetic shielding through suitable thermal treatment process.
Summary of the invention
Above-mentioned deficiency to prior art exists the purpose of this invention is to provide a kind of thermal treatment process that improves the high-strength wrought magnesium alloys capability of electromagnetic shielding; Through said thermal treatment process, when guaranteeing excellent mechanical performances, significantly improve the capability of electromagnetic shielding of high-strength wrought magnesium alloys.
The objective of the invention is to realize like this: the thermal treatment process that improves the high-strength wrought magnesium alloys capability of electromagnetic shielding; It is characterized in that: will push the magnesium alloy plate after the viscous deformation, and, be incubated 4 ~ 6 hours 380 ~ 420 ℃ of solid solutions; Shrend is to room temperature; Reheat to 130 ~ 190 ℃ timeliness is incubated 4 ~ 50 hours, and air cooling is to room temperature.
Further, said reheat is 130 ~ 170 ℃ of timeliness, is incubated 15 ~ 25 hours, and air cooling is to room temperature.
Further, the present invention improves the thermal treatment process of high-strength wrought magnesium alloys capability of electromagnetic shielding, can also be with magnesium alloy plate direct heating to 130 ~ 200 of extruding after the viscous deformation ℃, is incubated 4 ~ 90 hours, and air cooling is to room temperature.
Further, said magnesium alloy plate direct heating to 150 ~ 170 ℃ is incubated 4 ~ 50 hours, and air cooling is to room temperature.
In above-mentioned two kinds of schemes, said magnesiumalloy is handled through homogenizing earlier before the extruding viscous deformation, promptly in heat treatment furnace, magnesium alloy ingot is carried out homogenizing and handles, and processing parameter is: 360 ~ 430 ℃ of temperature, 6 ~ 20 hours time.
Compare prior art, the present invention has following advantage:
1, to improve the effect of high-strength wrought magnesium alloys capability of electromagnetic shielding remarkable in the present invention; The high-strength wrought magnesium alloys of extruding attitude is through thermal treatment process of the present invention; Can when guaranteeing excellent mechanical performances, significantly improve its capability of electromagnetic shielding; Solve present extruding attitude high-strength magnesium alloy because capability of electromagnetic shielding is not high enough, and limited the problem of its range of application.
2, close with the present invention thermal treatment process generally all is the mechanical property that is used to improve magnesiumalloy; And the present invention applies to improve the capability of electromagnetic shielding of magnesiumalloy with it; And obtained good effect; The capability of electromagnetic shielding of high-strength wrought magnesium alloys is promoted significantly, and mechanical property also is guaranteed.
3, the present invention uses wide: applicable to the commercial high-strength wrought magnesium alloys system (like ZK system or AZ system) of the multiple trade mark.
4, cost of the present invention is lower: the heat treatment furnace that is adopted is a common equipment, and technology is simply ripe, and operation easily is so cost is lower.
Description of drawings
Fig. 1 organizes photo for the scanning after the ZK60 magnesiumalloy extruding;
Fig. 2 is for after the ZK60 magnesiumalloy extruding, through 400 ℃ of solid solutions 5 hours, and shrend then, through 130 ℃ of timeliness 4 hours, photo was organized in the scanning behind the air cooling again;
Fig. 3 is for after the ZK60 magnesiumalloy extruding, through 400 ℃ of solid solutions 5 hours, and shrend then, through 130 ℃ of timeliness 20 hours, photo was organized in the scanning behind the air cooling again;
Fig. 4 is for after the ZK60 magnesiumalloy extruding, through 400 ℃ of solid solutions 5 hours, and shrend then, through 170 ℃ of timeliness 25 hours, photo was organized in the scanning behind the air cooling again;
Fig. 5 is for after the ZK60 magnesiumalloy extruding, and through 150 ℃ of timeliness 4 hours, photo was organized in the scanning behind the air cooling;
Fig. 6 is for after the ZK60 magnesiumalloy extruding, and through 150 ℃ of timeliness 15 hours, photo was organized in the scanning behind the air cooling;
Fig. 7 is for after the ZK60 magnesiumalloy extruding, and through 150 ℃ of timeliness 25 hours, photo was organized in the scanning behind the air cooling;
Fig. 8 is for after the ZK60 magnesiumalloy extruding, and through 150 ℃ of timeliness 50 hours, photo was organized in the scanning behind the air cooling.
Fig. 9 is for after the ZK60 magnesiumalloy extruding, and through 150 ℃ of timeliness 90 hours, photo was organized in the scanning behind the air cooling.
Embodiment
Combine specific embodiment with reference to the accompanying drawings, further set forth the present invention, what should explain is: these embodiment are used to explain the present invention, rather than limitation of the present invention, and protection scope of the present invention is not limited to following embodiment.
Embodiment 1:A kind of heat-treatment technology method that improves the high-strength wrought magnesium alloys capability of electromagnetic shielding,
This thermal treatment process may further comprise the steps:
(1) adopt raw material magnesium alloy: use common ZK60 high-strength wrought magnesium alloys ingot casting to be raw material, alloying constituent (weight percentage) is: 6.37%Zn, 0.53%Zr, impurity element are less than 0.007%, and all the other are Mg.
(2) homogenizing of magnesium alloy ingot is handled: the homogenizing of in heat treatment furnace, carrying out magnesium alloy ingot is handled, and processing parameter is: 420 ℃ of temperature, 12 hours time.
(3) extruding viscous deformation: the magnesium alloy ingot after the homogenizing processing is pushed on extrusion machine, and processing parameter is: 390 ℃ of extrusion temperatures, extrusion ratio are 3.33.
Fig. 1 is a ZK60 wrought magnesium alloys ingot casting, the scanned photograph after the extruding viscous deformation.As can be seen from the figure, the magnesiumalloy of extruding attitude is at crystal boundary and intracrystalline more second (MgZn and the MgZn mutually that distribute
2), and in the more serious intercrystalline of the deformation ratio tiny dynamic recrystallized structure that also distributing.ZK60 magnesiumalloy tensile strength at room temperature after crimp is 283MPa, and ys is 230MPa, and unit elongation is 26%; When frequency was 200MHz and 1200MHz, the effectiveness of shielding of alloy was respectively 60.2dB, 55.8dB.
(4) solid solution+aging thermal treating process: will push wrought magnesium alloys after the viscous deformation 400 ℃ of solid solutions, and be incubated 5 hours, shrend is to room temperature, and reheat to 130 ℃ timeliness is incubated 4 hours, and air cooling is to room temperature.
Fig. 2 is that extruding attitude ZK60 magnesiumalloy is through the metallographic structure photo behind solid solution+aging thermal treating process.Compare with the described extruding attitude of above-mentioned steps (3) magnesiumalloy, grain-size is bigger, and some second are separated out on matrix.Through the ZK60 of technology solid solution+ageing treatment of the present invention wrought magnesium alloys, tensile strength at room temperature is 327MPa, and ys is 270MPa, and unit elongation is 23%; When frequency was 200MHz and 1200MHz, the effectiveness of shielding of alloy was respectively 63.7dB, 56.8dB.
Embodiment 2:Raw material magnesium alloy and homogenizing treatment process, viscous deformation, solution heat treatment technology and parameter are identical with embodiment 1.Just the aging thermal treating process parameter after the solution heat treatment is different, and parameter is: 130 ℃ of temperature, 20 hours time.
Handle the ZK60 wrought magnesium alloys that obtains through embodiment 2, tensile strength at room temperature is 319MPa, and ys is 252MPa, and unit elongation is 20%; When frequency was 200MHz and 1200MHz, the effectiveness of shielding of alloy was respectively 68.7dB, 60.0dB.
Embodiment 3:Employing is handled, is pushed viscous deformation, solution heat treatment technology with embodiment 1 same raw material magnesium alloy, magnesium alloy ingot homogenizing, and processing parameter is identical.Different is that the wrought magnesium alloys after the embodiment 1 described solution heat treatment is carried out aging heat treatment processing parameter difference, and parameter is: 170 ℃ of temperature, 25 hours time.
Fig. 4 is that photo is organized in the scanning after the extruding attitude ZK60 magnesiumalloy process embodiment 3 said thermal treatments, and as can be seen from the figure, the intracrystalline of alloy all has a large amount of second to separate out mutually with crystal boundary, be disperse, uniform distribution, and second phase amount is than Fig. 3 showed increased.Handle the ZK60 wrought magnesium alloys that obtains through embodiment 2, tensile strength at room temperature is 327MPa, and ys is 294MPa, and unit elongation is 21%; When frequency was 200MHz and 1200MHz, the effectiveness of shielding of alloy was respectively 70.5dB, 63.1dB.
Embodiment 4:Employing is handled, is pushed viscous deformation with embodiment 1 same raw material magnesium alloy, magnesium alloy ingot homogenizing, and processing parameter is identical.Different is not carry out after the extruding viscous deformation handling but directly carry out artificial aging as implementing 1 described solid solution treatment process, and its processing parameter is: be heated to 150 ℃ of timeliness, be incubated 4 hours, air cooling is to room temperature.
Handle the ZK60 wrought magnesium alloys that obtains through embodiment 4, tensile strength at room temperature is 303MPa, and ys is 241MPa, and unit elongation is 20%; When frequency was 200MHz and 1200MHz, effectiveness of shielding was respectively 71.7dB, 65.5dB.
In the present embodiment after the extruding viscous deformation ZK60 magnesiumalloy scanning of direct labor's ageing treatment organize as shown in Figure 5.Contrast visiblely with Fig. 2, the crystal grain of Fig. 5 is comparatively tiny, separate out second be evenly distributed mutually, tiny, intensive, and quantity is more.This is owing under the as-heat-treated condition of direct aging, Deformation structures such as dislocation when alloy has kept the extruding viscous deformation and substructure, and they provide a large amount of forming core points, help second and separate out mutually.
Embodiment 5:The raw material magnesium alloy that present embodiment adopts, magnesium alloy ingot homogenizing are handled, the extruding plastic deformation process is all identical with embodiment 4, and processing parameter is also consistent.The soaking time that artificial aging that different with embodiment 4 is is handled is different, and soaking time is 15 hours.
Fig. 6 pushes attitude ZK60 magnesiumalloy through 150 ℃ of timeliness, the scanned photograph after the insulation 15h thermal treatment.As can be seen from the figure, the alloy after the ageing treatment has still kept the tissue that partly pushes after the viscous deformation, and promptly grain size is inhomogeneous, has separated out a large amount of tiny Mg-Zn second phases on the magnesium matrix.Handle the ZK60 wrought magnesium alloys that obtains through embodiment 5, tensile strength at room temperature is 316MPa, and ys is 269MPa, and unit elongation is 20%; When frequency was 200MHz and 1200MHz, effectiveness of shielding was respectively 77.3dB, 71.6dB.
Embodiment 6:The raw material magnesium alloy that present embodiment adopts, magnesium alloy ingot homogenizing are handled, the extruding plastic deformation process is all identical with embodiment 4, and processing parameter is also consistent.Different is the soaking time difference of ageing treatment, and soaking time is 25 hours.
Present embodiment interalloy artificial aging handles that (150 ℃ * scanning after 25h) is organized as shown in Figure 7, compares with Fig. 6, and separating out of second phase is more even.Handle the ZK60 wrought magnesium alloys that obtains through embodiment 6, tensile strength at room temperature is 304MPa, and ys is 274MPa, and unit elongation is 17%; When frequency was 200MHz and 1200MHz, effectiveness of shielding was respectively 70.0dB, 65.6dB.
Embodiment 7:The raw material magnesium alloy that present embodiment adopts, magnesium alloy ingot homogenizing are handled, the extruding plastic deformation process is all identical with embodiment 4, and processing parameter is also consistent.Different is the soaking time difference of ageing treatment, and soaking time is 50h hour.
Handle the ZK60 wrought magnesium alloys that obtains through embodiment 7, tensile strength at room temperature is 313MPa, and ys is 285MPa, and unit elongation is 19%; When frequency was 200MHz and 1200MHz, the effectiveness of shielding of alloy was respectively 79.5dB, 68.4dB.
Embodiment 8:The raw material magnesium alloy that present embodiment adopts, magnesium alloy ingot homogenizing are handled, the extruding plastic deformation process is all identical with embodiment 4, and processing parameter is also consistent.Different is the soaking time difference of ageing treatment, and soaking time is 90h hour.
Fig. 9 is 150 ℃ of direct aging of ZK60 wrought magnesium alloys, and photo is organized in the scanning of insulation 50h, finds that with Fig. 5,6,7,8 contrasts alloy is timeliness under identical temperature, and along with the prolongation of aging time, second separates out mutually and increase, and grain-size increases a little.Handle the ZK60 wrought magnesium alloys that obtains through embodiment 8, tensile strength at room temperature is 319MPa, and ys is 295MPa, and unit elongation is 16%; When frequency was 200MHz and 1200MHz, the effectiveness of shielding of alloy was respectively 71.2dB, 58.0dB.
High-strength wrought magnesium alloys capability of electromagnetic shielding and mechanical property are relatively in table 1 the foregoing description
The mechanism of action of magnesiumalloy shielding electromagnetic wave is the coefficient results of three kinds of attenuating mechanisms (reflection loss, attenuation by absorption, inner multiple attenuation), and the various factors of the above-mentioned mechanism of every influence (specific conductivity, magnetic permeability, material thickness, frequency etc.) all can influence the capability of electromagnetic shielding of alloy to a certain extent.Especially the conductivity variations of alloy is bigger to the influence of capability of electromagnetic shielding, and the specific conductivity of alloy is high more, and its capability of electromagnetic shielding is just good more.It is generally acknowledged that now the specific conductivity of wrought magnesium alloys can regulate and control through thermal treatment.The present invention is through the control thermal treatment process; Alloying element in the magnesiumalloy is separated out with the form of second phase; Reduced the scattering process of magnesium matrix to conduction electron; Thereby improve the specific conductivity of alloy, finally make the shielding properties of the capability of electromagnetic shielding of heat treatment state alloy, and the tensile strength of alloy also has rising to a certain degree apparently higher than extruding attitude alloy.This is that conventional process techniques is not available.
Can know through above embodiment and table 1 analysis: common high-strength deforming magnesium alloy can obtain all good high-strength wrought magnesium alloys of capability of electromagnetic shielding and mechanical property through thermal treatment process of the present invention.High-strength wrought magnesium alloys after thermal treatment process of the present invention is handled has wide range of applications, and can satisfy the actual demand of fields such as 3C Product, electronics, communication, aerospace and defence and military to high-strength, high shielding properties and lightweight material.And the used processing unit of the present invention is simple, the lower and easy handling of cost.
Because length, the present invention is an objective for implementation with typical high-strength wrought magnesium alloys ZK60 only, equally other similar high-strength wrought magnesium alloys is not had the effect that is equal to but do not get rid of the inventive method; Technology according to the invention widely applicable is applicable to the high-strength wrought magnesium alloys system of the multiple trades mark such as ZK system, AZ system or ZM system.
Equally, to the temperature of timeliness of the present invention, the value that soaking time also is not limited to embodiment.Aging temp is according to the difference of high-strength wrought magnesium alloys system, and optional about 130 ~ 200 ℃ any value is like 140 ℃, 160 ℃, 175 ℃ or 190 ℃ etc.; Soaking time also is the difference according to the high-strength wrought magnesium alloys system, optional 4 ~ 90 hours, like 10 hours, 35 hours or 60 hours or the like; All can get a desired effect through experiment, owing to the length reason, no longer burdensome at this.Process method of the present invention especially is fit to through after the extruding viscous deformation, and tensile strength is that the high-strength magnesium alloy of 250 ~ 400MPa improves capability of electromagnetic shielding.
Claims (5)
1. improve the thermal treatment process of high-strength wrought magnesium alloys capability of electromagnetic shielding, it is characterized in that: will push the magnesium alloy plate after the viscous deformation, 380 ~ 420 ℃ of solid solutions; Be incubated 4 ~ 6 hours, shrend is to room temperature, reheat to 130 ~ 190 ℃ timeliness; Be incubated 4 ~ 50 hours, air cooling is to room temperature.
2. the thermal treatment process of raising high-strength wrought magnesium alloys capability of electromagnetic shielding according to claim 1 is characterized in that: said reheat is 130 ~ 170 ℃ of timeliness, is incubated 15 ~ 25 hours, and air cooling is to room temperature.
3. improve the thermal treatment process of high-strength wrought magnesium alloys capability of electromagnetic shielding, it is characterized in that: will push magnesium alloy plate direct heating to 130 ~ 200 ℃ after the viscous deformation, and be incubated 4 ~ 90 hours, air cooling is to room temperature.
4. according to claim
3The thermal treatment process of described raising high-strength wrought magnesium alloys capability of electromagnetic shielding is characterized in that: said magnesium alloy plate direct heating to 150 ~ 170 ℃, be incubated 4 ~ 50 hours, and air cooling is to room temperature.
According to claim 1 or
3The thermal treatment process of described raising high-strength wrought magnesium alloys capability of electromagnetic shielding; It is characterized in that: said magnesiumalloy is before the extruding viscous deformation; Handle through homogenizing earlier; Promptly in heat treatment furnace, magnesium alloy ingot is carried out homogenizing and handle, processing parameter is: 360 ~ 430 ℃ of temperature, 6 ~ 20 hours time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103710655A (en) * | 2014-01-16 | 2014-04-09 | 张霞 | Heat treatment method of heat-resistant magnesium alloy |
| CN116145060A (en) * | 2023-03-01 | 2023-05-23 | 昆明理工大学 | High-conductivity high-electromagnetic shielding effect Mg-Zn-Y alloy and preparation method thereof |
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| CN1544683A (en) * | 2003-11-20 | 2004-11-10 | 洛阳铜加工集团有限责任公司 | Process for rolling deformation magnesium and magnesium alloy sheet material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103710655A (en) * | 2014-01-16 | 2014-04-09 | 张霞 | Heat treatment method of heat-resistant magnesium alloy |
| CN103710655B (en) * | 2014-01-16 | 2015-07-29 | 徐茂航 | A kind of heat treating method of heat resistance magnesium alloy |
| CN116145060A (en) * | 2023-03-01 | 2023-05-23 | 昆明理工大学 | High-conductivity high-electromagnetic shielding effect Mg-Zn-Y alloy and preparation method thereof |
| CN116145060B (en) * | 2023-03-01 | 2023-12-26 | 昆明理工大学 | High-conductivity high-electromagnetic shielding effect Mg-Zn-Y alloy and preparation method thereof |
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Application publication date: 20120822 |