CN102041419A - Grain refining method for AZ31 magnesium alloy - Google Patents
Grain refining method for AZ31 magnesium alloy Download PDFInfo
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- CN102041419A CN102041419A CN201010595990.XA CN201010595990A CN102041419A CN 102041419 A CN102041419 A CN 102041419A CN 201010595990 A CN201010595990 A CN 201010595990A CN 102041419 A CN102041419 A CN 102041419A
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- alloy
- melt
- grain
- magnesium
- magnesium alloy
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000861 Mg alloy Inorganic materials 0.000 title abstract description 21
- 238000007670 refining Methods 0.000 title abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 34
- 239000000956 alloy Substances 0.000 claims abstract description 34
- 239000000155 melt Substances 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 239000013078 crystal Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000007663 fining method Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 abstract description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052749 magnesium Inorganic materials 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010309 melting process Methods 0.000 abstract 2
- 230000006911 nucleation Effects 0.000 abstract 2
- 238000010899 nucleation Methods 0.000 abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 abstract 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 7
- 238000005266 casting Methods 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000006025 fining agent Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000007872 degassing Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018131 Al-Mn Inorganic materials 0.000 description 1
- 229910018461 Al—Mn Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910021323 Mg17Al12 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 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
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- VHHHONWQHHHLTI-UHFFFAOYSA-N hexachloroethane Chemical compound ClC(Cl)(Cl)C(Cl)(Cl)Cl VHHHONWQHHHLTI-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a grain refining method for AZ31 magnesium alloy. In the method, an effective nucleation core is separated out in the solidification process of melt by regulating the mass ratio of magnesium (Mg) to ferrum (Fe) in the melting process, so that tiny and equiaxial AZ31 ingots are obtained. By the method, the effective nucleation core is formed in the subsequent process of the melt only by regulating and controlling the mass ratio of the Mg to the Fe, without greatly changing the preparation melting process of the AZ31 alloy, so that the grain refining aim is fulfilled; and a grain refiner does not need to be added, so that the method is low in cost, high in production efficiency and simple in operation and has no pollution.
Description
Technical field
The present invention relates to a kind of crystal fining method of AZ31 magnesium alloy, belong to the Metal smelting field.
Background technology
Magnesium alloy is a lightest present structural metallic materials, it has low density, high specific strength, high specific stiffness, good resistance to shock, good capability of electromagnetic shielding, good castability and machining property have obtained increasing application in fields such as automobile, traffic, aviations.But because magnesium has the crystalline network of close-packed hexagonal, cause the viscous deformation sexuality of magnesium alloy relatively poor, greatly limited the Application of Magnesium scope.Grain refinement technology is the research focus of Application of Magnesium development field as the effective means of improving magnesium alloy plastic deformation ability always.
It is alloy that AZ31 belongs to Mg-Al, is present most popular wrought magnesium alloys.For Mg-Al is the grain refining of alloy, and using maximum at present is that carbonaceous breeds method: promptly add carbon or carbide in alloy melt, pour into a mould the method that obtains small grains after breeding for some time.Carbonaceous fining agent commonly used is hexachloroethane (C
2Cl
6) and magnesite (MgCO
3).C wherein
2Cl
6With MgCO
3The most extensive in industry.But C
2Cl
6In use can discharge a large amount of chlorine, severe corrosion equipment, infringement operator ' s health; MgCO
3Thinning effect not as good as C
2Cl
6, and the thinning effect instability, cause casting flaws such as pore, slag inclusion easily.
Mg-Al is that the relevant patent citation of alloy grain refinement technology is as follows:
(1) patent [200410017862] discloses a kind of high-strength high-plasticity Mg-Al base magnesium alloy.This invention is by adding a spot of Ti in magnesium alloy, the crystal grain of obvious refining Mg-Al-based magnesium alloy effectively improves the form and the distribution of Mg17Al12 phase, thereby reaches the purpose that improves magnesium alloy strength.
(2) patent [200410044836] discloses a kind of magnesium or grain refiner for magnesium alloy, and grain-refining agent is made up of aluminium powder and carbon dust, and its quality proportioning is 3: 1～6: 1.
(3) patent [200510024186] has been invented grain-refining agent of a kind of Mg-Al series magnesium alloy and preparation method thereof, and the component of fining agent and weight percent are: Al:90～95%, Ti:3.0～5.0%, B:1.0～5.0%, Sr:0.5～1.0%.
(4) patent [200710053530] provides a kind of magnesium and magnesium alloy composite grain refiner and preparation method thereof.The chemical ingredients of fining agent is (weight percent): Al:15～37.5%, C:5～12.5%, and Ce:5～20%, surplus is Mg.
(5) patent [200910060406] provides a kind of magnesium and grain refiner for magnesium alloy preparation method.The chemical ingredients of described fining agent is (weight percent): Ti:13.78～55.10%, B:6.22～22.90%, and surplus is a magnesium.
(6) patent [200910021711] provides a kind of method of AZ91D magnesium alloy grains.This method is to be that the fining agent of forming at 1: 1 adds in the AZ91D melt with SiC powder and magnesium powder by mass ratio, pours into a mould under 700～710 ℃ temperature then, obtains grain refining effect.
To sum up, be grain-refining agent and the process for refining that does not also have a kind of efficient, environmental protection in the alloy at whole M g-Al.Therefore, if can develop a kind of efficiently, the grain refining technology of environmental protection, will expand the Application of Magnesium field greatly, have important economic and social benefit.
Summary of the invention
Fe is that Mg-Al is a detrimental impurity element common in the alloy, can the significant corrosion resistance nature that reduces magnesium alloy.Therefore in production practice, the Fe content in the magnesium alloy can be controlled at below 0.01% usually.But on the other hand, Mn, the Al reaction in Fe meeting and the melt generates Al
8(Mn, Fe)
5Or Al-Mn forming core core, the effectively grain-size of refinement magnesium alloy.
Utilize the above-mentioned feature of Mn in the magnesium alloy, Fe element, the objective of the invention is to propose a kind of crystal fining method of AZ31 alloy of efficient, environmental protection, its principle is under the prerequisite that does not reduce the corrosion resistant characteristic, reaches the purpose of crystal grain thinning by the Mn in the regulation and control AZ31 alloy, the quality proportioning of Fe element.
A kind of crystal fining method of AZ31 alloy, following each processing step of process:
(1) melting AZ31 alloy;
(2) Mn, the Fe content in determination step (1) the gained AZ31 melt;
(3) according to the detected result of step (2), the Al-20Mn master alloy is added in step (1) the gained melt, regulate the content of Mn, Fe;
(4) insulation makes Fe, Mn fully be diffused in the melt;
(5) melt cast can obtain to have the AZ31 alloy cast ingot of fine isometric crystal grains.
When described step (3) is regulated in the melt Mn, Fe content:
When the quality percentage composition of Fe in the detected result in the step (2) is 0.001%～0.005%, add the Al-20Mn master alloy, the quality percentage composition that makes Mn is 0.1%～0.15%;
When the quality percentage composition of Fe in the detected result in the step (2) is 0.005%～0.01%, add the Al-20Mn master alloy, the mass ratio that makes Mn and Fe is 20～25: 1.
Holding temperature in the described step (4) is 710～730 ℃, and soaking time is 20～30 minutes.
The advantage of this method is:
(1) need not the preparation melting technology of AZ31 alloy is carried out significant movement, only, make melt in follow-up process of setting, form effective forming core core, reach the purpose of grain refining by the quality proportioning of regulation and control Mn and Fe.
(2) need not additionally to add grain-refining agent, cost is low, and the production efficiency height is simple to operate, pollution-free.
Embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1
(1) melting AZ31 alloy;
(2) the Fe content in determination step (1) the gained AZ31 melt is 0.002%, and Mn content is 0.003%;
(3) according to the detected result of step (2), the Al-20Mn master alloy is added in step (1) the gained melt, the quality percentage composition that makes Mn is 0.1%;
(4) 720 ℃ are incubated 30min down, make Fe, Mn fully be diffused in the melt;
(5) melt can obtain to have the AZ31 alloy cast ingot of fine isometric crystal grains through refining, the degassing, cast.
Grain fineness number analysis revealed ingot casting grain-size is 140 μ m.
Embodiment 2
(1) melting AZ31 alloy;
(2) the Fe content in determination step (1) the gained AZ31 melt is 0.008%, and Mn content is 0.01%;
(3) according to the detected result of step (2), the Al-20Mn master alloy is added in step (1) the gained melt, the quality percentage composition that makes Mn is 0.25%;
(4) 710 ℃ are incubated 25min down, make Fe, Mn fully be diffused in the melt;
(5) melt can obtain to have the AZ31 alloy cast ingot of fine isometric crystal grains through refining, the degassing, cast.
Grain fineness number analysis revealed ingot casting grain-size is 210 μ m.
Embodiment 3
(1) melting AZ31 alloy;
(2) the Fe content in determination step (1) the gained AZ31 melt is 0.01%, and Mn content is 0.25%;
(3) according to the detected result of step (2), the Al-20Mn master alloy is added in step (1) the gained melt, the quality percentage composition that makes Mn is 0.2%;
(4) 730 ℃ are incubated 20min down, make Fe, Mn fully be diffused in the melt;
(5) melt can obtain to have the AZ31 alloy cast ingot of fine isometric crystal grains through refining, the degassing, cast.
Grain fineness number analysis revealed ingot casting grain-size is 160 μ m.
Embodiment 4
(1) melting AZ31 alloy;
(2) the Fe content in determination step (1) the gained AZ31 melt is 0.001%, and Mn content is 0.05%;
(3) according to the detected result of step (2), the Al-20Mn master alloy is added in step (1) the gained melt, the quality percentage composition that makes Mn is 0.15%;
(4) 720 ℃ are incubated 20min down, make Fe, Mn fully be diffused in the melt;
(5) melt can obtain to have the AZ31 alloy cast ingot of fine isometric crystal grains through refining, the degassing, cast.
Grain fineness number analysis revealed ingot casting grain-size is 200 μ m.
Claims (3)
1. the crystal fining method of an AZ31 alloy is characterized in that through following each processing step:
(1) melting AZ31 alloy;
(2) Mn, the Fe content in determination step (1) the gained AZ31 melt;
(3) according to the detected result of step (2), add the Al-20Mn master alloy to step (1)
In the gained melt, regulate the content of Mn, Fe;
(4) insulation makes Fe, Mn fully be diffused in the melt;
(5) melt cast can obtain to have the AZ31 alloy cast ingot of fine isometric crystal grains.
2. method according to claim 1 is characterized in that: when described step (3) is regulated in the melt Mn, Fe content:
When the quality percentage composition of Fe in the detected result in the step (2) is 0.001%～0.005%, add the Al-20Mn master alloy, the quality percentage composition that makes Mn is 0.1%～0.15%;
When the quality percentage composition of Fe in the detected result in the step (2) is 0.005%～0.01%, add the Al-20Mn master alloy, the mass ratio that makes Mn and Fe is 20～25: 1.
3. method according to claim 1 and 2 is characterized in that: the holding temperature in the described step (4) is 710～730 ℃, and soaking time is 20～30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010595990.XA CN102041419A (en) | 2010-12-20 | 2010-12-20 | Grain refining method for AZ31 magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010595990.XA CN102041419A (en) | 2010-12-20 | 2010-12-20 | Grain refining method for AZ31 magnesium alloy |
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| Publication Number | Publication Date |
|---|---|
| CN102041419A true CN102041419A (en) | 2011-05-04 |
Family
ID=43907964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010595990.XA Pending CN102041419A (en) | 2010-12-20 | 2010-12-20 | Grain refining method for AZ31 magnesium alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102041419A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555091A (en) * | 2017-01-22 | 2017-04-05 | 哈尔滨理工大学 | A kind of AZ31 wrought magnesium alloys and preparation method thereof |
| CN111690859A (en) * | 2020-06-23 | 2020-09-22 | 北京交通大学 | In-situ generation of Al8Mn4Gd-phase Mg-Al-Ca magnesium alloy modification design and preparation method thereof |
| CN113500174A (en) * | 2021-06-25 | 2021-10-15 | 新程汽车工业有限公司 | Ultra-high strength lightweight fixed support |
-
2010
- 2010-12-20 CN CN201010595990.XA patent/CN102041419A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 《Journal of Japan Institute of Light Metals》 20011231 Tadashi HAITANI et al Grain refining mechanism of high-purity Mg-9 mass%Al alloy ingot and influence of Fe or Mn addition on cast grain size 第403～408页 1-3 第51卷, 第8期 2 * |
| 《中国优秀硕士学位论文数据库工程科技I辑》 20090515 万朋 Sr、Mn对含铁AZ91镁合金组织与性能的影响 第15～16页2.1.3，第33～34页3.4.2 1-3 , 第05期 2 * |
| 《中国有色金属学报》 20100831 王春建等 Mn元素对高纯Mg-3Al合金晶粒尺寸的影响 全文 1-3 第20卷, 第8期 2 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555091A (en) * | 2017-01-22 | 2017-04-05 | 哈尔滨理工大学 | A kind of AZ31 wrought magnesium alloys and preparation method thereof |
| CN106555091B (en) * | 2017-01-22 | 2018-04-10 | 哈尔滨理工大学 | A kind of AZ31 wrought magnesium alloys and preparation method thereof |
| CN111690859A (en) * | 2020-06-23 | 2020-09-22 | 北京交通大学 | In-situ generation of Al8Mn4Gd-phase Mg-Al-Ca magnesium alloy modification design and preparation method thereof |
| CN113500174A (en) * | 2021-06-25 | 2021-10-15 | 新程汽车工业有限公司 | Ultra-high strength lightweight fixed support |
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Application publication date: 20110504 |