CN1657641A - Alumina-magnesia-titanium-boron alloy and its preparation process - Google Patents
Alumina-magnesia-titanium-boron alloy and its preparation process Download PDFInfo
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- CN1657641A CN1657641A CN 200510042055 CN200510042055A CN1657641A CN 1657641 A CN1657641 A CN 1657641A CN 200510042055 CN200510042055 CN 200510042055 CN 200510042055 A CN200510042055 A CN 200510042055A CN 1657641 A CN1657641 A CN 1657641A
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Abstract
A high-strength and-stability AlMgTiB alloy contains Mg (9.5-13.5 mass%), Ti (0.2-0.4), B (0.04-0.08) and Al (restt). It is prepared through proportionally providing raw materials, smelting Al in electric crucible furnace, adding AlTiB interalloy and Mg blocks, smelting at 690 deg.C and casting at 640-675 deg.C. Its advantages are high tension strength, better toughness, high mechanical stability and high purity.
Description
Technical field
The invention belongs to metal material field, particularly relate to the alumina-magnesia-titanium-boron alloy and the preparation technology thereof of a kind of intensity height, stable performance.
Background technology
In traditional casting magnalium binary alloy, magnesium is the major components of alloy, and it has very big solid solubility in aluminium, and magnesium atom radius ratio aluminium is big by 13%, after magnesium dissolves in α (Al) sosoloid in a large number, just make the lattice of α produce bigger distortion, so aluminum magnesium alloy has very high solution strengthening effect.Along with the increase of Mg content, the mechanical property of alloy also significantly increases, but when the magnesium amount greater than 12% the time because under the heat-treat condition in the production usually, the β (Mg in the alloy structure
2Al
3) can not dissolve in α fully mutually, its mechanical property is descended greatly, so magnesium content generally is no more than 11.5% in the alloy.Alloy designations is that the chemical ingredients of ZAlMg10 is (mass ratio) magnesium: 9.5-11.0%, and surplus is an aluminium.Natural aging can take place in the less stable of this alloy mechanical performance, the alloy back of quenching in the life-time service process, the β boundary that hands down is constantly separated out and grown up, plasticity is descended greatly, when temperature surpasses 100 ℃, ag(e)ing process will be accelerated greatly, so alloy is unsuitable at high temperature working.This alloy also has significant stress corrosion inclination in addition.Because Natural Aging Process will significantly be quickened under stress, and separate out fragility β phase at crystal boundary, make alloy produce stress corrosion cracking along crystal boundary.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, and the alumina-magnesia-titanium-boron alloy and the preparation technology thereof of a kind of intensity height, good toughness, stable mechanical performance is provided.
The present invention realizes in the following manner:
A kind of alumina-magnesia-titanium-boron alloy contains aluminium, magnesium, titanium elements, it is characterized in that it also contains boron, and the mass percent of each component is: magnesium: 9.5-13.5%, and titanium: 0.2-0.4%, boron: 0.04-0.08%, all the other are aluminium.
The preparation technology of above-mentioned alumina-magnesia-titanium-boron alloy is characterized in that may further comprise the steps:
(1). use electrical crucible, adopt cast iron or cast steel crucible, in order to prevent to ooze iron, be coated with last layer coating on the surface of crucible, the coating composition is: talcum powder+water glass;
(2). according to magnesium: 9.5-13.5%, titanium: 0.2-0.4%, boron: 0.04-0.08%, all the other calculate for the mass percent of aluminium and take by weighing fine aluminium, pure magnesium, Al-Ti-B intermediate alloy as raw material;
(3). crucible is warmed up to 600 ℃ with resistance furnace, will adds in the crucible by insulating covering agent and the fine aluminium that magnesium chloride and Repone K are formed then, resistance furnace is warming up to 690 ℃ of insulations;
(4). treat after the fine aluminium fusing Al-Ti-B intermediate alloy and MAG block together to be added in the crucible, MAG block will be pressed into crucible bottom with bell jar, melts fully until it;
(5). after being incubated 5 minutes, adding aluminum chloride or zinc chloride and carry out the degasification refining, the degasification clock mask slowly moves in liquation so that refining is complete;
(6). refining was left standstill the cast of skimming 5 minutes after finishing between 640-675 ℃.
The preparation technology of above-mentioned alumina-magnesia-titanium-boron alloy is characterized in that in the step (2) aluminium content 〉=99.7% in the fine aluminium, Mg content in the pure magnesium 〉=99.95%; The mass percent of each composition is in the Al-Ti-B intermediate alloy: titanium 5%, and boron 1%, all the other are aluminium.
The preparation technology of above-mentioned alumina-magnesia-titanium-boron alloy is characterized in that the add-on of used insulating covering agent in the step (3) is the 3-4% of furnace charge total mass, and the mass percent of each component is a magnesium chloride 60% in the insulating covering agent, Repone K 40%; The add-on of aluminum chloride or zinc chloride is the 0.15-0.2% of furnace charge total mass in the step (5).
Compare with ZAlMg10, alloy strength height of the present invention, tensile strength can reach more than the 215MPa under the as cast condition, and tensile strength reached 340MPa after the foundry goods that cast is good carried out T4 thermal treatment, improved all more than 15%, and elongation after fracture can reach 12%.Alloy element titanium that adds and boron are formed the disperse of titanium boron compound and are distributed in crystal boundary, can effectively suppress separating out of β phase, have improved the stability of alloy mechanical performance.Content of impurities in this alloy＜0.85%, wherein Fe＜0.3%; Si＜0.3%; Cu＜0.1%; Mn＜0.15%.
Embodiment
Provide three most preferred embodiments of the present invention below:
Embodiment one
Preparation 20Kg contains magnesium 10%, titanium 0.2%, boron 0.04%, and surplus is the alumina-magnesia-titanium-boron alloy of aluminium, and preparation technology is as follows:
(1). adopt electrical crucible, the cast steel crucible;
(2). preparation of raw material: aluminium block (aluminium 〉=99.7%); MAG block (magnesium 〉=99.95%); Al-Ti-B intermediate alloy (Al-5Ti-1B);
Because titanium and boron are present in in a kind of master alloy, so when calculating desired content, need only calculate getting final product of a kind of element, this example is in titanium elements.With reference to " the casting handbook (the 3rd volume, the casting nonferrous alloy, the 2nd edition, China Machine Press, 2001.10, P187-188) and experience determine the scaling loss amount of alloying element, aluminium: 1.5%, magnesium: 20%, titanium: 1%, boron: 0.5%.
The add-on calculation formula:
In the formula: M is the molten alloy total mass;
A is the percentage ratio that should contain certain element in the alloy;
C is the percentage ratio of contained certain element in master alloy or the alloy pig;
E is the scaling loss amount of certain element;
X is for adding the total mass of certain element or master alloy.
In example, M=20Kg;
A：Mg％＝10％；Ti％＝0.2％；B％＝0.04％；Al％＝89.64％；
C：Mg％＝99.95％；Ti％＝5％；B％＝1％；Al％＝99.7％；
E：Al：1.5％，Mg：20％，Ti：1％，B：0.5％。Then:
The quality of the fine aluminium that Al-Ti-B intermediate alloy is brought into is: 0.81 * 94%=0.76Kg
So the quality that need add fine aluminium is: 18.28-0.76=17.52Kg;
(3). crucible is warmed up to 600 ℃ with resistance furnace, adds 17.52 kilograms of insulating covering agent 730 grams, fine aluminiums, be warming up to 690 ℃ of insulations;
(4). 2.50 kilograms of 0.81 kilogram of fine aluminium fusing back adding Al-Ti-B intermediate alloy and MAG blocks, MAG block is pressed into crucible bottom with bell jar, melts fully until it;
(5). be incubated after 5 minutes, add zinc chloride refining agent 40 grams and carry out the degasification refining, the degasification clock mask slowly moves in liquation so that refining is complete;
(6). after refining finishes, left standstill 5 minutes the cast of skimming under 660 ℃.
The gained alloy ingredient is: magnesium: 10%; Titanium: 0.2%; Boron: 0.04%; Content of impurities＜0.85%, surplus are aluminium.Tensile strength of alloys is 221MPa under the as cast condition, it is 354MPa that T4 handles back tensile strength, elongation after fracture is 13%, and alloy element titanium and boron can form titanium boron compound particle that disperse distributes can suppress β separating out mutually, thereby has improved the stability of alloy mechanical performance.
Embodiment two
Preparation 20Kg contains magnesium 13%, titanium 0.4%, boron 0.08%, and surplus is the alumina-magnesia-titanium-boron alloy of aluminium
Take the processing step identical with embodiment one, wherein step (2) calculate each raw material add-on be: 3.25 kilograms in pure magnesium, 1.62 kilograms of Al-Ti-B intermediate alloys, 16.10 kilograms of fine aluminiums; Add aluminum chloride 40 grams in the step (5) and carry out the degasification refining.
The gained alloy ingredient is: magnesium: 13%; Titanium: 0.4%; Boron: 0.08%; Content of impurities＜0.85%, surplus are aluminium.Tensile strength of alloys is 230MPa under the as cast condition, and it is 365MPa that T4 handles back tensile strength, and elongation after fracture is 12%.
Embodiment three
Preparation 20Kg magnesium content 11.5%, titaniferous amount 0.3%, boron-containing quantity 0.06%, surplus is the alumina-magnesia-titanium-boron alloy of aluminium
Take the processing step identical with embodiment one, wherein step (2) calculate each raw material add-on be: 2.88 kilograms in pure magnesium, 1.22 kilograms of Al-Ti-B intermediate alloys, 16.80 kilograms of fine aluminiums.
The gained alloy ingredient is: magnesium: 11.5%; Titanium: 0.3%; Boron: 0.06%; Content of impurities＜0.85%, surplus are aluminium.Tensile strength of alloys is 226MPa under the as cast condition, and it is 357MPa that T4 handles back tensile strength, and elongation after fracture is 12%.
Claims (4)
1. an alumina-magnesia-titanium-boron alloy contains aluminium, magnesium, titanium elements, it is characterized in that it also contains boron, and the mass percent of each component is: magnesium: 9.5-13.5%, and titanium: 0.2-0.4%, boron: 0.04-0.08%, all the other are aluminium.
2. the preparation technology of the described alumina-magnesia-titanium-boron alloy of claim 1 is characterized in that may further comprise the steps:
(1). use electrical crucible, adopt cast iron or cast steel crucible, in order to prevent to ooze iron, be coated with last layer coating on the surface of crucible, the coating composition is: talcum powder+water glass;
(2). according to magnesium: 9.5-13.5%, titanium: 0.2-0.4%, boron: 0.04-0.08%, all the other calculate for the mass percent of aluminium and take by weighing fine aluminium, pure magnesium, Al-Ti-B intermediate alloy as raw material;
(3). crucible is warmed up to 600 ℃ with resistance furnace, will adds in the crucible by insulating covering agent and the fine aluminium that magnesium chloride and Repone K are formed then, resistance furnace is warming up to 690 ℃ of insulations;
(4). treat after the fine aluminium fusing Al-Ti-B intermediate alloy and MAG block together to be added in the crucible, MAG block will be pressed into crucible bottom with bell jar, melts fully until it;
(5). after being incubated 5 minutes, adding aluminum chloride or zinc chloride and carry out the degasification refining, the degasification clock mask slowly moves in liquation so that refining is complete;
(6). refining was left standstill the cast of skimming 5 minutes after finishing between 640-675 ℃.
3. according to the preparation technology of the described alumina-magnesia-titanium-boron alloy of claim 2, it is characterized in that in the step (2) aluminium content 〉=99.7% in the fine aluminium, Mg content in the pure magnesium 〉=99.95%; The mass percent of each composition is in the Al-Ti-B intermediate alloy: titanium 5%, and boron 1%, all the other are aluminium.
4. according to the preparation technology of claim 2 or 3 described alumina-magnesia-titanium-boron alloys,, it is characterized in that the add-on of used insulating covering agent in the step (3) is the 3-4% of furnace charge total mass, the mass percent of each component is a magnesium chloride 60% in the insulating covering agent, Repone K 40%; The add-on of aluminum chloride or zinc chloride is the 0.15-0.2% of furnace charge total mass in the step (5).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845577B (en) * | 2009-03-23 | 2012-10-31 | Alti电子株式会社 | Aluminium-magnesium alloy for interior material and exterior material |
| CN103898346A (en) * | 2012-12-25 | 2014-07-02 | 侯伟 | Novel magnesium alloy liquid covering agent and mixing technology thereof |
| CN106868358A (en) * | 2017-02-05 | 2017-06-20 | 林景阳 | A kind of engine cylinder cover composite |
| CN107604223A (en) * | 2017-11-07 | 2018-01-19 | 童信淞 | It is a kind of can anodic oxidation die casting aluminium and preparation method thereof |
| CN109707274A (en) * | 2019-01-03 | 2019-05-03 | 耿世超 | A kind of magnalium titanium alloy material forms and its processing method with temperature-monitoring function |
| CN109989074A (en) * | 2019-05-14 | 2019-07-09 | 柳州坚瑞新材料科技有限公司 | A kind of improved almag preparation method |
| CN115874078A (en) * | 2022-12-08 | 2023-03-31 | 安徽兆鑫铝业科技有限公司 | Production method of cast aluminum curtain wall plate |
-
2005
- 2005-01-27 CN CN 200510042055 patent/CN1285746C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845577B (en) * | 2009-03-23 | 2012-10-31 | Alti电子株式会社 | Aluminium-magnesium alloy for interior material and exterior material |
| CN103898346A (en) * | 2012-12-25 | 2014-07-02 | 侯伟 | Novel magnesium alloy liquid covering agent and mixing technology thereof |
| CN106868358A (en) * | 2017-02-05 | 2017-06-20 | 林景阳 | A kind of engine cylinder cover composite |
| CN107604223A (en) * | 2017-11-07 | 2018-01-19 | 童信淞 | It is a kind of can anodic oxidation die casting aluminium and preparation method thereof |
| CN109707274A (en) * | 2019-01-03 | 2019-05-03 | 耿世超 | A kind of magnalium titanium alloy material forms and its processing method with temperature-monitoring function |
| CN109989074A (en) * | 2019-05-14 | 2019-07-09 | 柳州坚瑞新材料科技有限公司 | A kind of improved almag preparation method |
| CN115874078A (en) * | 2022-12-08 | 2023-03-31 | 安徽兆鑫铝业科技有限公司 | Production method of cast aluminum curtain wall plate |
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| CN1285746C (en) | 2006-11-22 |
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