CN109825751A - A kind of high thermal conductivity strong mechanical performance magnesium alloy materials and preparation method thereof - Google Patents
A kind of high thermal conductivity strong mechanical performance magnesium alloy materials and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 42
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 30
- 239000011777 magnesium Substances 0.000 claims abstract description 26
- 229910001371 Er alloy Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000000930 thermomechanical effect Effects 0.000 claims abstract description 6
- 229910052691 Erbium Inorganic materials 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 23
- 229910052749 magnesium Inorganic materials 0.000 claims description 23
- 238000004321 preservation Methods 0.000 claims description 22
- 238000001125 extrusion Methods 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 239000010439 graphite Substances 0.000 claims description 19
- 229910002804 graphite Inorganic materials 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims description 9
- 239000011701 zinc Substances 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 239000006104 solid solution Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 238000005275 alloying Methods 0.000 description 5
- 239000004411 aluminium Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Abstract
A kind of high thermal conductivity strong mechanical performance magnesium alloy materials and preparation method thereof, belong to the thermally conductive field of magnesium alloy, each component and mass percent in high thermal conductivity strong mechanical performance magnesium alloy provided by the present invention are as follows: Zn content 5.5~6.5%, Er content is 0.5~6.5%, remaining is Mg and essential impurity.High thermal conductivity Mg-Zn-Er alloy material of the invention is achieved through the following technical solutions, and the steps include: the preparation of 1. cast alloy materials；2. thermomechanical treatment process.Alloy of the invention has high thermal conductivity, is expected to be applied to the fields such as the hardware more demanding to heating conduction such as automobile engine, LED radiator, 3C electronic product skeleton, this greatly expands the application of magnesium alloy.
Description
Technical field
The invention belongs to magnesium alloy is thermally conductive and its preparation field, and in particular to develop a kind of high thermal conductivity magnesium alloy materials and
Preparation method.
Background technique
With the progress that modern industry makes rapid progress, each field starts to occur that device densification and energy high density is presented
The development trend of change, such as phenomena such as the number of chips of electronics industry increases, and the density of electronic component and equipment is higher and higher.By
This bring Hot disaster be also it is huge, such as the service life of 3C Product itself and military service efficiency, the working efficiency of engine, LED light
Luminous efficiency and service life etc. receive severe challenge.Therefore it in order to avoid heat aggregation bring negative effect, improves and produces
The military service efficiency of product and service life ensure the property life security of people, and developing good Heat Conduction Material is to realize this purpose
A kind of economical and effective important means.
Currently, common high-thermal conductive metal material is mostly the alloys such as zinc, aluminium, copper, but copper, zinc can only continue decades, aluminium
Also the centuries can only be maintained.One of the most abundant resource of reserves, reserves 2.4% are only second to iron and aluminium to magnesium on earth,
Occupy the 3rd in common metal.Content in ocean and salt lake is also very considerable, if the content of magnesium in ocean is up to 6 × 1016
Ton.Again since magnesium can be recycled, magnesium is referred to as the metal material of " inexhaustible ".China is
Magnesium resource production and big export country, reserves occupy the first place in the world.Therefore, as conventional metals mineral products are increasingly depleted, magnesium is developed
Resource keeps the sustainable development of metal thermal conductive material, has a highly important social effect and economic effect.
The thermal coefficient of pure magnesium is 158W/mK, and fine copper and fine aluminium are only second in metal material, has been more than space travel
Thermally conductive requirement of the device to material, however its mechanical property is very low, intensity is about 10MPa or so, is added using common preparation
Its yield strength of work method is also extremely difficult to 200MPa or more, this also largely limits its application, for deficiency, commonly
It is that alloying element is added, although this improves mechanical property, the addition of alloying element inevitably makes the lattice of magnesium matrix
It is distorted, scattering is generated to the electronics and phonon of conduction heat, the mean free path of electronics and phonon is reduced, to reduce thermal conductivity
Rate.Solute atoms is influenced the effect of alloy heat/resistivity by several factors, the volume including solute atoms Yu Mg atom
Variance rate (Δ V/VMg), chemical valence and electron outside nucleus distribution of solute atoms etc..It is dissolved " the specific thermal resistance of atom in the magnesium alloy
Rate " and " specific resistance rate " size order are as follows: Zn < Al < Ca < Sn < Mn < Zr.Therefore, when metallic alloying, Zn element is added
It is a selection most friendly to heating conduction.Mg-Zn system alloy is the deformed magnesium alloy being widely used, with good
Ageing strengthening ability has higher intensity and better bearing capacity compared with Mg-Al system alloy.
Although Mg-Zn system alloy mechanical property is excellent, it is limited by thermal conductivity after alloying element raising mechanical property is added
It can reduce, the thermally conductive of As-extruded ZC71 magnesium alloy is 122W/mK, but tensile strength only has 240MPa, and the tensile strength of ZE63A can
Up to 300MPa, but thermally conductive only 109W/mK, in general shifting inversion relationship is presented in heating conduction and mechanical property,
This significantly limits the application of the alloy system.
The scheme that the present invention proposes against the above deficiency has following positive effect: one, specific alloy element having been used to protect
While card reduces thermal conductivity as small as possible, mechanical property is significantly improved；Two, effectively with special thermomechanical treatment process
Precipitation and distribution of second phase in alloy substrate are controlled, is obviously improved alloy heating conduction with mechanical property.
Summary of the invention
The problem of technical purpose of the invention is inverted primarily directed to current traditional magnesium alloy heating conduction and mechanical property,
By special alloying and deformation heat treatment method, a kind of high thermal conductivity is developed and magnesium alloy materials that strong mechanical performance has both,
It is set to be hopeful to be applied to the fields such as the aerospace and automobile structure more demanding to heating conduction.
Each component and mass percent in high thermal conductivity provided by the present invention, strong mechanical performance magnesium alloy are as follows: Zn content 5.5
~6.5%, Er content are 0.5~6.5%, Impurity Fe content≤0.002%, Ni content≤0.001%, Si content≤
0.02%, Cu content≤0.013%, remaining is Mg.
A kind of preparation method of high thermal conductivity strong mechanical performance Mg-Zn-Er alloy material, is achieved through the following technical solutions
's.It the steps include:
1) preparation of cast alloy material；2) thermomechanical treatment process
It is specific as follows:
1) preparation of cast alloy material
(1) weight percent of component in magnesium ingot, zinc ingot metal, Mg-Er intermediate alloy according to target alloy is stocked up, and
It is dried in 200 DEG C of Muffle furnace；
(2) graphite crucible is heated to 200 DEG C of heat preservation 2min in induction furnace and outwells lime-ash；
(3) magnesium ingot preheated in (1) is put into the graphite crucible of (2) and is heated to 720 DEG C, and led into graphite crucible
Enter to protect gas (SF2+N2)；
(4) Mg-Er intermediate alloy and zinc ingot metal in (1) are added after the magnesium ingot in graphite crucible melts completely, melts completely
5min is kept the temperature after change and obtains Mg-Zn-Er alloy solution, stands 5min after stirring 3min, it, will after removing surface scum and oxide skin
Mg-Zn-Er alloy solution is cast in metal die, and Mg-Zn-Er cast alloy is made；
2) thermomechanical treatment process
(1) (SF under the conditions of protection gas2+N2), as cast condition Mg-Zn-Er alloy is put into Muffle furnace and is heated to 350~500 DEG C
Solid solution 6~12h of heat preservation, is subsequently processed into extrusion ingot；
(2) (SF under the conditions of protection gas2+N2), extrusion ingot obtained in (1) is placed in extrusion die and is heated to jointly
Extruded rod is directly squeezed into after 280~450 DEG C of 15~30min of heat preservation, extrusion ratio is 9~26；
(3) (SF under the conditions of protection gas2+N2), extruded rod is put into Muffle furnace be heated to 150~225 DEG C heat preservation 30~
It takes out and is directly placed into water after 90h.
The method that high thermal conductivity Mg-Zn-Er alloy is obtained while of the present invention has the advantages that whole preparation process
Simply, process is short, can solve at present magnesium alloy mechanical property and the unmatched disadvantage of heating conduction on the market, can be used as automobile
Engine, aerospaceplane, the structural member of 3C electronic product and signal communication structural member etc. require heating conduction very high
Structural member application field, expand the application range of magnesium alloy.The heating conduction of gained alloy is not less than 125.5W/mK.Power
Performance yield strength is learned up to 275.5MPa (embodiment does not have yield strength), tensile strength is up to 315.7MPa.
Detailed description of the invention
Fig. 1 is Mg-Zn-Er alloy plastic deformation in example 1,2,3 and the photo after heat treatment；
Fig. 2 is the Mg-Zn-Er alloy optical photograph after being plastically deformed and be heat-treated in example 1；
Fig. 3 is the Mg-Zn-Er alloy stereoscan photograph after being plastically deformed and be heat-treated in example 1；
Fig. 4 is the Mg-Zn-Er alloy thermal diffusion coefficient and thermal conductivity after being plastically deformed and be heat-treated in example 1
It can be with the comparison of cast alloy；
Fig. 5 is the Mg-Zn-Er alloy mechanical property and cast alloy after being plastically deformed and be heat-treated in example 1
Comparison.
Specific embodiment
The present invention is further illustrated below with reference to specific embodiment, it should be pointed out that following embodiment is served only for
Bright specific implementation method of the invention, can not limit rights protection scope of the present invention.
Embodiment 1
1. being divided into Mg-6Zn-1Er according to group of magnesium alloys weighs 435.2g magnesium ingot, 27.7g zinc ingot metal, 35.1gMg-Er is closed centre
Ingot and being put into Muffle furnace is heated to 200 DEG C of drying preheatings, and is passed through protection gas (SF2+N2).By graphite crucible in induction furnace
In be heated to 200 DEG C of heat preservation 2min and outwell lime-ash.Preheated magnesium ingot is put into graphite crucible and is heated to 720 DEG C, and to stone
Protection gas (SF is passed through in black crucible2+N2).It is separately added into preheated Mg-Er after the magnesium ingot in graphite crucible melts completely
Between alloy and zinc ingot metal, heat preservation 5min obtains Mg-Zn-Er alloy solution after the ingot after newly be added melts completely, stirs 3min
After stand 5min.Remove surface scum and oxide skin, Mg-Zn-Er alloy solution is cast in metal die, Mg- is made
6Zn-1Er cast alloy.
2. in protection gas (SF2+N2) under, as cast condition Mg-6Zn-1Er alloy is put into Muffle furnace and is heated to 350 DEG C of heat preservations
12h is subsequently processed into extrusion ingot.Extrusion ingot is placed in extrusion die after being heated to 380 DEG C of heat preservation 30min jointly and is squeezed into
Extruded rod, extrusion ratio 9.Extruded rod is put into Muffle furnace again after being heated to 150 DEG C of heat preservation 30h and is removed and placed in water.System
Obtaining the thermally conductive of sample is 125.5W/ (mK), yield strength 275.5MPa, tensile strength 315.7MPa.
Embodiment 2
1. being divided into Mg-6Zn-3Er according to group of magnesium alloys weighs 864.2g magnesium ingot, 55.6g zinc ingot metal, among 100.2g Mg-Er
Alloy pig and being put into Muffle furnace is heated to 200 DEG C of drying preheatings, and is passed through protection gas (SF2+N2).Graphite crucible is being incuded
It is heated to 200 DEG C of heat preservation 2min in furnace and outwells lime-ash.Preheated magnesium ingot is put into graphite crucible and is heated to 720 DEG C, and to
Protection gas (SF is passed through in graphite crucible2+N2).Preheated Mg-Er is separately added into after the magnesium ingot in graphite crucible melts completely
Intermediate alloy and zinc ingot metal, heat preservation 5min obtains Mg-Zn-Er alloy solution after the ingot after newly be added melts completely, stirs
5min is stood after 3min.Remove surface scum and oxide skin, Mg-Zn-Er alloy solution is cast in metal die, is made
Mg-6Zn-3Er cast alloy.
2. in protection gas (SF2+N2) under, as cast condition Mg-6Zn-3Er alloy is put into Muffle furnace and is heated to 425 DEG C of heat preservations
10h is subsequently processed into extrusion ingot.Extrusion ingot is placed in extrusion die after being heated to 280 DEG C of heat preservation 15min jointly and is squeezed into
Extruded rod, extrusion ratio 18.Extruded rod is put into Muffle furnace again after being heated to 225 DEG C of heat preservation 60h and is removed and placed in water.System
Obtaining the thermally conductive of sample is 127.5W/ (mK), yield strength 237.6MPa, tensile strength 297.7MPa.
Embodiment 3
1. being divided into Mg-6Zn-6Er according to group of magnesium alloys weighs 254.5g magnesium ingot, 33.3g zinc ingot metal, among 187.5g Mg-Er
Alloy pig and being put into Muffle furnace is heated to 200 DEG C of drying preheatings, and is passed through protection gas (SF2+N2).Graphite crucible is being incuded
It is heated to 200 DEG C of heat preservation 3min in furnace and outwells lime-ash.Preheated magnesium ingot is put into graphite crucible and is heated to 720 DEG C, and to
Protection gas (SF is passed through in graphite crucible2+N2).Preheated Mg-Er is separately added into after the magnesium ingot in graphite crucible melts completely
Intermediate alloy and zinc ingot metal, heat preservation 5min obtains Mg-Zn-Er alloy solution after the ingot after newly be added melts completely, stirs
5min is stood after 3min.Remove surface scum and oxide skin, Mg-Zn-Er alloy solution is cast in metal die, is made
Mg-6Zn-6Er cast alloy.
2. in protection gas (SF2+N2) under, as cast condition Mg-6Zn-6Er alloy is put into Muffle furnace and is heated to 500 DEG C of heat preservations
6h is subsequently processed into extrusion ingot.Extrusion ingot is placed in extrusion die after being heated to 450 DEG C of heat preservation 20min jointly and is squeezed into
Extruded rod, extrusion ratio 26.Extruded rod is put into Muffle furnace again after being heated to 180 DEG C of heat preservation 90h and is removed and placed in water.System
Obtaining the thermally conductive of sample is 120.9W/ (mK), yield strength 212.1MPa, tensile strength 283.6MPa.
Although listing in detail here and illustrating that case is preferably implemented, skilled person will appreciate that, it can not take off
Carried out in the case where from marrow of the present invention it is various improve, addition, the modes such as replacement, these contents, which are all identified as belonging to right, to be wanted
Within the scope of the present invention defined by asking.
Claims (3)
1. a kind of high thermal conductivity, strong mechanical performance magnesium alloy, which is characterized in that each component and mass percent are as follows: Zn content 5.5~
6.5%, Er content are 0.5~6.5%, Impurity Fe content≤0.002%, Ni content≤0.001%, Si content≤
0.02%, Cu content≤0.013%, remaining is Mg.
2. a kind of high thermal conductivity described in claim 1, the preparation method of strong mechanical performance magnesium alloy, which is characterized in that including with
Lower step:
1) preparation of cast alloy material；2) thermomechanical treatment process；
It is specific as follows:
1) preparation of cast alloy material
(1) weight percent of component in magnesium ingot, zinc ingot metal, Mg-Er intermediate alloy according to target alloy is stocked up, and 200
DEG C Muffle furnace in dried；
(2) graphite crucible is heated to 200 DEG C of heat preservation 2min in induction furnace and outwells lime-ash；
(3) magnesium ingot preheated in (1) is put into the graphite crucible of (2) and is heated to 720 DEG C, and be passed through guarantor into graphite crucible
Protect gas；
(4) Mg-Er intermediate alloy and zinc ingot metal in (1) are added after the magnesium ingot in graphite crucible melts completely, after melting completely
Heat preservation 5min obtains Mg-Zn-Er alloy solution, 5min is stood after stirring 3min, after removing surface scum and oxide skin, by Mg-
Zn-Er alloy solution is cast in metal die, and Mg-Zn-Er cast alloy is made；
2) thermomechanical treatment process
(1) under the conditions of protecting gas, as cast condition Mg-Zn-Er alloy is put into Muffle furnace be heated to 350~500 DEG C of solid solutions keep the temperature 6~
12h is subsequently processed into extrusion ingot；
(2) under the conditions of protecting gas, extrusion ingot obtained in (1) is placed in extrusion die and is heated to 280~450 DEG C of guarantors jointly
Extruded rod is directly squeezed into after 15~30min of temperature, extrusion ratio is 9~26；
(3) under the conditions of protecting gas, extruded rod is put into Muffle furnace to after being heated to 150~225 DEG C of 30~90h of heat preservation taking-up and straight
It connects into the water.
3. according to the method for claim 2, which is characterized in that the protection gas bar part is the mixed gas of SF6+N2,
Ratio is 1:10.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819863A (en) * | 2019-12-02 | 2020-02-21 | 北京工业大学 | Low-rare earth high-thermal conductivity magnesium alloy and preparation method thereof |
| CN111172481A (en) * | 2020-01-10 | 2020-05-19 | 北京工业大学 | Two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy |
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| CN104894447A (en) * | 2015-04-03 | 2015-09-09 | 北京工业大学 | Layered/acicular two-phase composite enhanced rare earth magnesium alloy and preparation technology thereof |
| CN105543603A (en) * | 2016-02-05 | 2016-05-04 | 重庆大学 | Low-rare-earth high-strength deforming magnesium alloy and preparation method thereof |
| CN109161767A (en) * | 2018-10-23 | 2019-01-08 | 北京工业大学 | A kind of creep-resistant property magnesium alloy of the phase containing W and preparation method thereof |
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2019
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|---|---|---|---|---|
| JP2008231536A (en) * | 2007-03-22 | 2008-10-02 | Honda Motor Co Ltd | Magnesium alloy, and method for manufacturing magnesium alloy member |
| CN102605227A (en) * | 2012-03-27 | 2012-07-25 | 北京工业大学 | Magnesium alloy reinforced by nano-quasi-crystal particles and preparation method of the alloy |
| CN104894447A (en) * | 2015-04-03 | 2015-09-09 | 北京工业大学 | Layered/acicular two-phase composite enhanced rare earth magnesium alloy and preparation technology thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110819863A (en) * | 2019-12-02 | 2020-02-21 | 北京工业大学 | Low-rare earth high-thermal conductivity magnesium alloy and preparation method thereof |
| CN110819863B (en) * | 2019-12-02 | 2021-01-05 | 北京工业大学 | Low-rare earth high-thermal conductivity magnesium alloy and preparation method thereof |
| CN111172481A (en) * | 2020-01-10 | 2020-05-19 | 北京工业大学 | Two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy |
| CN111172481B (en) * | 2020-01-10 | 2021-12-31 | 北京工业大学 | Two-stage continuous extrusion preparation method for improving yield strength of Mg-Zn-Er alloy |
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