CN1672828A - Reverse temperature field extrusion process for producing microcrystal magnesium alloy - Google Patents
Reverse temperature field extrusion process for producing microcrystal magnesium alloy Download PDFInfo
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- CN1672828A CN1672828A CN 200510009905 CN200510009905A CN1672828A CN 1672828 A CN1672828 A CN 1672828A CN 200510009905 CN200510009905 CN 200510009905 CN 200510009905 A CN200510009905 A CN 200510009905A CN 1672828 A CN1672828 A CN 1672828A
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- magnesium alloy
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- temperature field
- extrusion process
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- 238000001125 extrusion Methods 0.000 title claims abstract description 62
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000013081 microcrystal Substances 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000001192 hot extrusion Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 238000007712 rapid solidification Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005551 mechanical alloying Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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- Extrusion Of Metal (AREA)
- Forging (AREA)
Abstract
The reverse temperature field extrusion process as improved extrusion process for producing microcrystal magnesium alloy includes the following steps: preheating extrusion mold, setting magnesium alloy blank into the extrusion mold, controlling the mold temperature the same as or 30-50 deg.c higher than that of blank surface and the temperature difference between the core of the blank and the surface of the blank in 20-400 deg.c, and extrusion at extrusion ratio of 2-64 and extrusion ram speed of 20-30 mm/s. Extruding magnesium alloy in the said reverse temperature field and at extrusion ratio of 4-6 can fine the crystal particle to below 10 micron, or below 5 micron optimally. Meanwhile, the extruded magnesium alloy has obvious raised plasticity and unit extension over 20 %. The present invention may be used in producing magnesium alloy rod, plate, section bar and pipe.
Description
Technical field:
The present invention is the improvement to pressing method.
Background technology:
Magnesium is the abundantest metals of earth's crust surface mineral resources, and China accounts for 1/3 of world's magnesium ore resources.Magnesium is metal the lightest in the structural metallic materials, and its density only is 1.74g/cm
3, be 2/3 of aluminium density.Magnesium alloy has high specific strength and specific stiffness, good resistance to impact and anti-seismic performance, characteristics that capability of electromagnetic shielding is good, is expected to replace engineering plastics to make case material, is described as 21 century cleaning material recyclable and free from environmental pollution.In fields such as Aero-Space, automobile, train, light rail train, telecommunications, household electrical appliance, increasingly extensive application will be obtained.
Magnesium alloy belongs to the close-packed hexagonal crystal structure, and its plasticity is poor, difficulty is carried out plastic working, and particularly magnesium alloy sheet production is more difficult, and production efficiency is low, and the cost height costs an arm and a leg, and has limited the magnesium alloy range of application, makes magnesium alloy not reach the aluminium alloy popularization.For this reason, seek low-cost, efficient, excellent performance, the further new process of production magnesium alloy rod, sheet material, section bar, tubing of plastic working moulding, become the research topic of domestic and international extensive concern.
The processing method of tradition magnesium alloy can only be hot extrusion, and extrusion temperature is between 300～400 ℃, and extrusion speed is slower, production efficiency is low, extrusion bar and sheet material crystal grain are bigger, and main performance index is a percentage elongation, and internal and international percentage elongation standard the best is about 12%.Traditional magnesium alloy hot-extrusion method is that blank heating is put into mould to uniform temperature, the mould and die preheating uniform temperature generally is lower than blank heating temperature, form a forward temperature field, that is to say that blank heart portion temperature is apparently higher than the blank surface temperature, add the mould inner surface frictional influence, blank heart portion flow of metal flowing velocity causes significant plastic deformation inhomogeneous apparently higher than blank surface when making extruding, if blank and mold temperature are all lower, the very easy magnesium alloy when extruding cracking that makes.
Improve magnesium alloy plasticity, whole world scientific worker is making great efforts to improve or improve magnesium alloy plasticity, only make magnesium alloy grains below 10 μ m, just might increase substantially magnesium alloy plasticity, magnesium alloy just helps follow-up plastic working forming part like this.
Reach very difficulty of the following size of 10 μ m by hot rolling of traditional magnesium alloy multi-pass and the cold rolling crystal grain thinning of multi-pass.The new process of refinement magnesium alloy crystal grain mainly contains both at home and abroad at present: rapid solidification powder jacket pushes hot rolling again, the hot rolling again of mechanical alloying powder jacket compactly extruding, equal channel angle formula extruding (ECAE) method.These methods can make magnesium alloy grains arrive the sub-micron order of magnitude, yet these method cost height are difficult to produce in enormous quantities.Ripe at present new process is a rapid solidification double-roller rolling technology, the magnesium alloy crystallite dimension is reached below the 10 μ m, all take rapid solidification casting magnesium alloy plate as domestic University Of Chongqing, Fuzhou Huamei New Technology Development Co., Ltd., Australian national science and technology and industrial research center etc.
Summary of the invention:
The present invention exists significant plastic deformation inhomogeneous in order to solve the magnesium alloy extruding, grain refining effect is not remarkable, shortcoming easy to crack during extruding, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process is provided, this method can once be pushed the magnesium alloy of producing the following crystallite dimension of 10 μ m, help improving or improving magnesium alloy plasticity, it is applicable to the bar of extrusion molding manufacturing magnesium alloy, sheet material, section bar or tubing, it is processed according to following step: pre-hot-extrusion mold, control extrusion die temperature is consistent with the blank surface temperature or be higher than 30～50 ℃ of blank surface temperature, the magnesium alloy blank is put into mould, heart portion and surface temperature difference are controlled at 100～320 ℃ of scopes, and extrusion ratio can be chosen in 2～64 scopes, extrusion die drift speed is 20～30mmS
-1Condition under push.
Different with traditional magnesium alloy hot extrusion process method, when the present invention adopts the reverse temperature field extruding, magnesium alloy blank heart portion and surface temperature are in 20～400 ℃ of scopes, the blank surface temperature is apparently higher than blank heart portion temperature, magnesium alloy blank reverse temperature field thermograde is pressed blank heart portion and the control of surface temperature difference, temperature difference is controlled between 100 ℃～320 ℃, temperature difference capping when billet size is big, and a billet size hour temperature difference takes off limit.During extruding, blank forms the thermograde that the surface is higher than heart portion, is referred to as reverse temperature field.Because the reverse temperature field extrusion magnesium alloy has improved the inhomogeneities of distortion, and extrusion afterbody pit is diminished; Because reverse temperature field crimp is more even relatively, so the grain size of extrusion is also more even, prevented that the extruded bars coarse grain ring from forming.The reverse temperature field extrusion magnesium alloy that provides by the present invention, but extrusion ratio at 4～6 o'clock crystal grain thinnings below 10 μ m, the best can be controlled in below the 5 μ m.The reverse temperature field extruding is compared crystal grain thinning significantly with general hot extrusion, plasticity after the therefore general magnesium alloy extruding all improves a lot, percentage elongation can reach more than 20%, improve a lot than traditional hot extrusion magnesium alloy spare percentage elongation about 12%, its percentage elongation improves 66.7% at least, helps the plastic working forming part of realizing that magnesium alloy is follow-up.The present invention is not only applicable to magnesium alloy, is applicable to kirsite, titanium alloy, aluminium alloy yet, and is mainly bigger to the difficult-to-deformation material meaning.This method can an extrusion molding, and maximum extrusion ratio reaches 64 and do not crack; Extrusion speed is very fast, and extruding drift speed can reach 20mmS
-1More than, can improve stock utilization 10～20%; Best extrusion ratio is under 4～6 situation, can make the AZ31 magnesium alloy grains, average grain size can refine to below the 10 μ m, its tensile strength of AZ31 magnesium alloy reaches about 270MPa, percentage elongation reaches 24～28%, the advantage that it has, and technology is simple, cost is low, production efficiency is high, improve magnesium alloy plasticity.
The specific embodiment:
The specific embodiment one: present embodiment is processed according to following step: in order to reduce friction, the surface of extrusion die takes traditional oil base graphite or water-based graphite to lubricate; Pre-hot-extrusion mold, control extrusion die temperature is consistent with the blank surface temperature or be higher than 30～50 ℃ of blank surface temperature, blank is put into mould, guarantee that the blank surface temperature is apparently higher than heart portion temperature, heart portion and surface temperature difference are controlled at 100～320 ℃ of scopes, the temperature on magnesium alloy blank heart portion and surface can be adjusted in 20～300 ℃ or 20～200 ℃ of scopes, and the large scale blank can be in 80～400 ℃ of scopes; Be 2～64 in extrusion ratio then, extrusion die drift speed is 20～30mmS
-1Condition under push.The extrusion ratio of present embodiment all can realize in 2～64 scopes, not crack; When selecting large extrusion ratio, the influence that the temperature that fuel factor produces in the time of must considering extruding raises.Blank heart portion metal flow speed was starkly lower than blank limit portion metal flow speed when reverse temperature field extrusion process began, because extruding heats up and the conduction of extrusion process heat is accelerated than beginning, the blank surface and the heart portion temperature difference of extrusion billet latter half are reduced, that is to say that the thermograde of extrusion process reverse temperature field changes.In order to guarantee whole extrusion process all the time at the reverse temperature field state, high extrusion speed is favourable, and extrusion speed of the present invention for this reason is higher than conventional extruded speed, is chosen in 20～30mmS
-1
The specific embodiment two: present embodiment is that example describes with the AZ31 magnesium alloy, and concrete process conditions are as follows:
A, billet size Φ 40 * 60mm, extrusion ratio is 6.25, extrusion bar Φ 16mm;
The thermograde of b, reverse temperature field is by four kinds of scheme controls, and blank surface and heart portion temperature difference are respectively 150 ℃, 200 ℃, 250 ℃, 300 ℃;
C, extrusion die inner surface oiling foundation stone China ink lubricate, and the extrusion die preheat temperature is undertaken by the temperature among the b respectively;
D, extruding drift movement velocity are 22mmS
-1
The extruding force of e, four kinds of schemes is respectively: 1000MPa, 800MPa, 600MPa, 500MPa;
F, extrusion ratio be the crystallite dimension of 4～6 reverse temperature field extruding AZ31 magnesium alloy below 10 μ m, be below the 5 μ m if the extrusion temperature gradient under 100 ℃～150 ℃ situations, can obtain optimum grain size; The AZ31 magnesium alloy at the material property of extrusion ratio 6.25 reverse temperature fields extruding is: tensile strength sigma
b: 272MPa, percentage elongation δ: 24%, tensile strength sigma
bReach as high as 275MPa, percentage elongation reaches 28%.
Claims (8)
1, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process, it is characterized in that it is processed according to following step: pre-hot-extrusion mold, the magnesium alloy blank is put into extrusion die, control extrusion die temperature is consistent with the blank surface temperature or be higher than 30 ℃～50 ℃ of blank surface temperature, blank heart portion and surface temperature difference are 2～64 in extrusion ratio, extrusion die drift speed is 20～30mmS then in 100 ℃～320 ℃ scopes
-1Condition under push.
2, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process according to claim 1, the inner surface that it is characterized in that extrusion die scribble oil base graphite or water-based graphite is lubricated.
3, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process according to claim 1 is characterized in that magnesium alloy blank heart portion and surface temperature are 80 ℃～400 ℃.
4, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process according to claim 1 is characterized in that magnesium alloy blank heart portion and surface temperature are 20 ℃～300 ℃.
5, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process according to claim 1 is characterized in that magnesium alloy blank heart portion and surface temperature are 20 ℃～200 ℃.
6, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process according to claim 1 is characterized in that extrusion ratio is 4～6.
7, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process according to claim 1 is characterized in that extrusion ratio is 6.25.
8, a kind of manufacturing microcrystal magnesium alloy reverse temperature field extrusion process according to claim 1, it is characterized in that pushing the drift movement velocity is 22mmS
-1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100099056A CN1310711C (en) | 2005-04-19 | 2005-04-19 | Reverse temperature field extrusion process for producing microcrystal magnesium alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100099056A CN1310711C (en) | 2005-04-19 | 2005-04-19 | Reverse temperature field extrusion process for producing microcrystal magnesium alloy |
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| Publication Number | Publication Date |
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| CN1672828A true CN1672828A (en) | 2005-09-28 |
| CN1310711C CN1310711C (en) | 2007-04-18 |
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| CNB2005100099056A Expired - Fee Related CN1310711C (en) | 2005-04-19 | 2005-04-19 | Reverse temperature field extrusion process for producing microcrystal magnesium alloy |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892445A (en) * | 2010-07-07 | 2010-11-24 | 中南大学 | Method for preparing magnesium alloy bar with superhigh intensity by powerful deformation |
| CN101121979B (en) * | 2007-09-20 | 2010-12-01 | 上海交通大学 | Method for preparing Mg-Zn-Zr deformation magnesium alloy |
| CN102059483A (en) * | 2010-12-29 | 2011-05-18 | 重庆研镁科技有限公司 | Production process for magnesium alloy extrusion soldering wire |
| CN102059266A (en) * | 2010-11-23 | 2011-05-18 | 张文丛 | Extrusion deformation method of aluminium alloy profile |
| CN102397899A (en) * | 2010-09-09 | 2012-04-04 | 无锡鸿声铝业有限公司 | Production technology of connecting rod aluminium section |
| CN103240292A (en) * | 2013-04-12 | 2013-08-14 | 河南理工大学 | Production method and device for magnesium alloy thin-wall pipe |
| CN105256263A (en) * | 2015-12-01 | 2016-01-20 | 天津东义镁制品股份有限公司 | Magnesium alloy heat-treatment method |
| CN105970130A (en) * | 2016-05-31 | 2016-09-28 | 东北大学 | Method for manufacturing fine-grain magnesium alloy through alternate inverted extrusion |
| CN107081341A (en) * | 2017-04-12 | 2017-08-22 | 山东省科学院新材料研究所 | A kind of magnesium alloy extrusion preparation method of high-strength high-plasticity |
| CN115896656A (en) * | 2022-12-14 | 2023-04-04 | 兰州理工大学 | Reverse temperature field low-temperature strong plasticity processing preparation method of superfine mixed crystal structure magnesium alloy |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011509833A (en) * | 2008-01-23 | 2011-03-31 | 哈爾濱工業大学 | Rolling process method for creating reverse temperature field of highly plastic magnesium alloy sheet |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06269851A (en) * | 1993-03-23 | 1994-09-27 | Mitsubishi Kasei Corp | Porous metallic composite and its production |
| JPH10317114A (en) * | 1997-05-14 | 1998-12-02 | Nippon Light Metal Co Ltd | Manufacture of medium-strength al-mg-si alloy extruded material excellent in air hardening property |
| JP4124386B2 (en) * | 1998-09-28 | 2008-07-23 | 博 穴田 | Method for producing high-strength aluminum or aluminum alloy rod |
| TW528621B (en) * | 2002-05-16 | 2003-04-21 | Jr-Ching Huang | High-extrusion-ratio fabrication and forming practice of low temperature and high strain rate superplastic AZ31 Mg alloys |
| RU2220016C1 (en) * | 2002-07-01 | 2003-12-27 | Закрытое акционерное общество "Промышленный центр "МАТЭКС" | Method of production of presswork out of magnesium alloys |
| CN1222373C (en) * | 2003-04-12 | 2005-10-12 | 大连理工大学 | Magnesium alloy wire continuous extruding method |
-
2005
- 2005-04-19 CN CNB2005100099056A patent/CN1310711C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121979B (en) * | 2007-09-20 | 2010-12-01 | 上海交通大学 | Method for preparing Mg-Zn-Zr deformation magnesium alloy |
| CN101892445A (en) * | 2010-07-07 | 2010-11-24 | 中南大学 | Method for preparing magnesium alloy bar with superhigh intensity by powerful deformation |
| CN102397899A (en) * | 2010-09-09 | 2012-04-04 | 无锡鸿声铝业有限公司 | Production technology of connecting rod aluminium section |
| CN102059266A (en) * | 2010-11-23 | 2011-05-18 | 张文丛 | Extrusion deformation method of aluminium alloy profile |
| CN102059483A (en) * | 2010-12-29 | 2011-05-18 | 重庆研镁科技有限公司 | Production process for magnesium alloy extrusion soldering wire |
| CN103240292A (en) * | 2013-04-12 | 2013-08-14 | 河南理工大学 | Production method and device for magnesium alloy thin-wall pipe |
| CN105256263A (en) * | 2015-12-01 | 2016-01-20 | 天津东义镁制品股份有限公司 | Magnesium alloy heat-treatment method |
| CN105970130A (en) * | 2016-05-31 | 2016-09-28 | 东北大学 | Method for manufacturing fine-grain magnesium alloy through alternate inverted extrusion |
| CN107081341A (en) * | 2017-04-12 | 2017-08-22 | 山东省科学院新材料研究所 | A kind of magnesium alloy extrusion preparation method of high-strength high-plasticity |
| CN115896656A (en) * | 2022-12-14 | 2023-04-04 | 兰州理工大学 | Reverse temperature field low-temperature strong plasticity processing preparation method of superfine mixed crystal structure magnesium alloy |
| CN115896656B (en) * | 2022-12-14 | 2023-12-29 | 兰州理工大学 | Reverse temperature field low-temperature strong plastic processing preparation method of magnesium alloy with superfine mixed crystal structure |
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| CN1310711C (en) | 2007-04-18 |
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