CN102994788A - Method for refining pure aluminum of Al-5% Ti intermediate alloy - Google Patents
Method for refining pure aluminum of Al-5% Ti intermediate alloy Download PDFInfo
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- CN102994788A CN102994788A CN2012104759958A CN201210475995A CN102994788A CN 102994788 A CN102994788 A CN 102994788A CN 2012104759958 A CN2012104759958 A CN 2012104759958A CN 201210475995 A CN201210475995 A CN 201210475995A CN 102994788 A CN102994788 A CN 102994788A
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Abstract
The invention provides a process for refining pure aluminum of Al-5% Ti intermediate alloy. The process mainly comprises the following steps: 1), carrying out equal-channel deformation to the Al-5%Ti intermediate alloy under the room temperature; 2), putting a ceramic crucible with aluminum ingot and refining agent to a pit furnace for heating up to 760 DEG C for melting the aluminum ingot and refining agent; 3), adding the equal-channel deformed Al-5% Ti intermediate alloy, which is 0.1-1% of the weight of the pure aluminum, to the molten aluminum; 4), stirring and heating up the molten aluminum, stewing and keeping the temperature of the molten aluminum for 5-60 minutes; 5), pouring the molten aluminum to an iron mould at a temperature of 720 DEG C to 800 DEG C, de-moulding and water-cooling the molten aluminum to the room temperature. The refining process provided by the invention is adopted, TiAl3 phase of the Al-5%Ti intermediate alloy is changed to small blocks from plate strips, and used as effective heterogeneous nucleation core for improving the nucleation rate of the melt, so that grains are refined, grain size of industrial pure aluminum ingot can be reduced to lower than 200 microns, and good comprehensive physical and mechanical property is obtained.
Description
Technical field
The invention belongs to the metal material processing field, be specifically related to a kind of method of Al-5%Ti master alloy refinement fine aluminium.
Background technology
Aluminium alloy is widely used in the fields such as machinery, aerospace, building, electric appliance and electronic and automobile owing to light weight, the characteristics such as specific tenacity is high, corrosion-resistant, electrical and thermal conductivity performance is good, easy processing.Especially in the application of high-technology field, organizing in follow-up deep processing technology also proposed strict requirement to aluminium ingot and aluminium base, and one of key of controlling its tissue and performance to be founding go out best as-cast grain structure---tiny uniform equiax crystal.Yet aluminium and alloy thereof form thick grain structure easily under casting condition, realize its widespread use, must improve its as-cast structure.
The method of crystal grain thinning mainly contains physics and chemistry two classes, and physical method mainly comprises method for quick cooling, mechanical-physical refinement method and physical field refinement method.Chemical process is to add grain-refining agent, to promote grain nucleation or to hinder nuclei growth.Method for quick cooling is more commonly used when producing simple small articles or pulverulent product, realize the production of large-scale heavv section foundry goods is very difficult, and the method is not easy to operate, and human factor and randomness are larger.Impurity greatly, is easily mixed in mechanical-physical refinement method complicated operation, consumption, and thinning effect is unstable.Physical field refinement method is processed the metal high purity, but needs complicated production unit, and energy consumption is high, and people also are short in understanding to itself mechanism and rule.Adding fining agent effect stability, fast, easy to operate, the strong adaptability of effect, is a kind of the most economic, effective, practical thinning method.Studies show that the TiAl in Al-Ti, Al-Ti-B, the Al-Ti-C master alloy
3, TiB
2Can be used as heterogeneous nucleation core in the melt with the TiC particle, foundry goods is had good thinning effect.
Al-Ti master alloy low price, storage and transportation are all very convenient, use simple.But the disadvantage of Al-Ti alloy is the long-lasting and stable non-constant of grain refining, TiAl
3Size reach 20～30 μ m, in Al liquid, because action of gravity is sunk, in the process of leaving standstill, cause segregation.
The Al-Ti-B master alloy is present comparatively widely used fining agent, and about 75% Aluminum Industry in The World uses Al-Ti-B to carry out grain refining now.But there are problems in such fining agent, such as TiB
2Particle is easy to assemble, and very easily the salt flux in oxide film or melt is combined to cause and is mingled with TiB
2Size of particles is thick, when the aluminium foil that rolling grain size number is had relatively high expectations, can cause pin hole, makes sometimes strip breaks, and damages roll.
In order to solve thick TiAl
3The phased soln diffusion is incomplete, TiB
2The particle accumulation problem, patent of invention " Al-Ti-B master alloy refinement fine aluminium the technique " (patent No.: 200710093880.1) propose when adding Al-Ti-B master alloy fining agent to molten aluminium, to introduce high-energy ultrasound on molten aluminium top, accelerate TiAl
3The phased soln velocity of diffusion increases TiB
2The disperse distributed degrees of particle, thereby improve the refinement efficient of Al-Ti-B master alloy, the aluminium ingot grain-size can reach below the 150 μ m, but needs complicated high-energy ultrasonic equipment during scale operation, not only increase production cost, also be difficult to guarantee thinning effect.
Patent of invention " under the ultrasonic field effect preparation Al-Ti-C master alloy grain-refining agent " (patent No.: 200410103904.3) for TiC easily assemble mutually, the problem such as particle size distribution range is large, proposition prepares Al-Ti-C master alloy under the ultrasonic field effect, then be cast into ingot or continuous casting and rolling becomes wire rod.The result shows that TiC obtains significant refinement and dispersion mutually, and fine aluminium and aluminium alloy are had obvious thinning effect.But supersound process not only increases production cost, and is difficult to guarantee stability and the thinning effect of product when suitability for industrialized production.
In order to solve TiAl
3The problems such as phase size is thick the invention provides a kind of technique of Al-5%Ti master alloy refinement fine aluminium, with the TiAl in the Al-5%Ti master alloy
3Change tiny bulk into from lath-shaped, by how tiny block TiAl
3Serve as effective heterogeneous forming core core, thereby improve the refinement efficient of Al-5%Ti master alloy.
Summary of the invention
Purpose of the present invention mainly provides a kind of method of Al-5%Ti master alloy refinement fine aluminium.
The key step of Al-5%Ti master alloy refinement fine aluminium method provided by the invention is:
1) under the room temperature Al-5%Ti master alloy is waited channel deformation;
The ceramic crucible that 2) will be placed with aluminium ingot and refining agent is put into pit furnace and is heated to 760 ℃ and makes it fusing;
3) will wait channel deformation Al-5%Ti master alloy to join in the aluminium liquid;
4) behind the stirring aluminium liquid, be warmed up to teeming temperature, leave standstill insulation;
5) aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
In the channel deformations such as step 1), mould interior angle Φ is 90～120 °, and mould exterior angle Ψ is 0 °, and sample is not all rotated in every time distortion, and Deformation velocity 12mm/min, rolling pass are controlled in 3 passages.
Step 2) addition of described master alloy such as Al-5%Ti such as channel deformation such as grade is 0.1～1% of fine aluminium weight.
After aluminium liquid adding master alloy stirred, heats up in the step 4), leaving standstill soaking time was 5～60 minutes.
Teeming temperature described in the aforesaid method is 720～800 ℃.
Principle of the present invention is: under the room temperature, the Al-5%Ti master alloy is waited channel deformation, the TiAl in the Al-5%Ti master alloy
3Change tiny bulk into from lath-shaped, then the Al-5%Ti master alloy with the inferior channel deformation in different roads adds in the aluminium liquid, because how tiny block TiAl
3Serve as effective heterogeneous forming core core, improve the nucleation rate of crystal, thus crystal grain thinning.
Embodiment
Embodiment one
Commercial-purity aluminium and refining agent are joined in the ceramic crucible, and put it into be heated in the pit furnace 760 ℃ make it the fusing, by accounting for 0.6% of fine aluminium gross weight, undeformed Al-5%Ti master alloy is joined in the aluminium liquid, after stirring, heating up, leave standstill 60min, at 760 ℃ aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
Will the good aluminium ingot of cast, 20mm cuts at place above the distance bottom, and roughly grind, fine grinding, polishing, use eddy current conductivity apparatus testing conductivity.The relative conductivity (room temperature) that calculates aluminium ingot is 66.03%, and average grain size is 243.6 μ m, and microhardness is 32.8HV
0.3
Embodiment two
Commercial-purity aluminium and refining agent are joined in the ceramic crucible, and put it into be heated in the pit furnace 760 ℃ make it the fusing, get the Al-5%Ti master alloy of the inferior channel deformation in 1 road (110 ° at mould interior angle), by 0.6% joining in the aluminium liquid of accounting for fine aluminium weight, after stirring, heating up, leave standstill 5min, at 760 ℃ aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
Will the good aluminium ingot of cast, 20mm cuts at place above the distance bottom, and roughly grind, fine grinding, polishing, use eddy current conductivity apparatus testing conductivity.The relative conductivity of aluminium ingot (room temperature) is 63.78%, and average grain size is 216.3 μ m, and microhardness is 36.1HV
0.3
Embodiment three
Commercial-purity aluminium and refining agent are joined in the ceramic crucible, and put it into be heated in the pit furnace 760 ℃ make it the fusing, get the Al-5%Ti master alloy of the inferior channel deformation in 2 roads (110 ° at mould interior angle), by 0.6% joining in the aluminium liquid of accounting for fine aluminium weight, after stirring, heating up, leave standstill 30min, at 760 ℃ aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
Will the good aluminium ingot of cast, 20mm cuts at place above the distance bottom, and roughly grind, fine grinding, polishing, use eddy current conductivity apparatus testing conductivity.The relative conductivity of aluminium ingot (room temperature) is 62.58%, and average grain size is 178.7 μ m, and microhardness is 38.9HV
0.3
Embodiment four
Commercial-purity aluminium and refining agent are joined in the ceramic crucible, and put it into be heated in the pit furnace 760 ℃ make it the fusing, get the Al-5%Ti master alloy of the inferior channel deformation in 3 roads (110 ° at mould interior angle), by 0.6% joining in the aluminium liquid of accounting for fine aluminium weight, after stirring, heating up, leave standstill 60min, at 760 ℃ aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
Will the good aluminium ingot of cast, 20mm cuts at place above the distance bottom, and roughly grind, fine grinding, polishing, use eddy current conductivity apparatus testing conductivity.The relative conductivity of aluminium ingot (room temperature) is 61.37%, and average grain size is 169.4 μ m, and microhardness is 40.2HV
0.3
Embodiment five
Commercial-purity aluminium and refining agent are joined in the ceramic crucible, and put it into be heated in the pit furnace 760 ℃ make it the fusing, get the Al-5%Ti master alloy of the inferior channel deformation in 3 roads (110 ° at mould interior angle), by 0.1% joining in the aluminium liquid of accounting for fine aluminium weight, after stirring, heating up, leave standstill 5min, at 720 ℃ aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
Will the good aluminium ingot of cast, 20mm cuts at place above the distance bottom, and roughly grind, fine grinding, polishing, use eddy current conductivity apparatus testing conductivity.The relative conductivity of aluminium ingot (room temperature) is 62.74%, and average grain size is 180.5 μ m, and microhardness is 38.4HV
0.3
Embodiment six
Commercial-purity aluminium and refining agent are joined in the ceramic crucible, and put it into be heated in the pit furnace 760 ℃ make it the fusing, get the Al-5%Ti master alloy of the inferior channel deformation in 3 roads (110 ° at mould interior angle), by 1% joining in the aluminium liquid of accounting for fine aluminium weight, after stirring, heating up, leave standstill 60min, at 800 ℃ aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
Will the good aluminium ingot of cast, 20mm cuts at place above the distance bottom, and roughly grind, fine grinding, polishing, use eddy current conductivity apparatus testing conductivity.The relative conductivity of aluminium ingot (room temperature) is 60.86%, and average grain size is 161.6 μ m, and microhardness is 41.5HV
0.3
Embodiment seven
Commercial-purity aluminium and refining agent are joined in the ceramic crucible, and put it into be heated in the pit furnace 760 ℃ make it the fusing, get the Al-5%Ti master alloy of the inferior channel deformation in 3 roads (90 ° at mould interior angle), by 0.1% joining in the aluminium liquid of accounting for fine aluminium weight, after stirring, heating up, leave standstill 5min, at 720 ℃ aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
Will the good aluminium ingot of cast, 20mm cuts at place above the distance bottom, and roughly grind, fine grinding, polishing, use eddy current conductivity apparatus testing conductivity.The relative conductivity of aluminium ingot (room temperature) is 58.62%, and average grain size is 155.3 μ m, and microhardness is 44.8HV
0.3
Embodiment eight
Commercial-purity aluminium and refining agent are joined in the ceramic crucible, and put it into be heated in the pit furnace 760 ℃ make it the fusing, get the Al-5%Ti master alloy of the inferior channel deformation in 3 roads (120 ° at mould interior angle), by 1% joining in the aluminium liquid of accounting for fine aluminium weight, after stirring, heating up, leave standstill 60min, at 800 ℃ aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
Will the good aluminium ingot of cast, 20mm cuts at place above the distance bottom, and roughly grind, fine grinding, polishing, use eddy current conductivity apparatus testing conductivity.The relative conductivity of aluminium ingot (room temperature) is 62.35%, and average grain size is 176.4 μ m, and microhardness is 39.7HV
0.3
Grain size and micro-hardness testing the results are shown in Table 1 under commercial-purity aluminium and embodiment 1～8 process for refining.Commercial-purity aluminium is pressed the melting method among the embodiment 1～8, and when not adding the Al-Ti alloy in the aluminium liquid, the relative conductivity of aluminium ingot (room temperature) is 66.6%, and average grain size is 1150 μ m, and microhardness is 29.3HV
0.3Can see, after interpolation waits channel deformation Al-5%Ti master alloy in commercial-purity aluminium, along with the increase that waits the channel deformation passage, the grain-size of fine aluminium reduces gradually, relative conductivity is on a declining curve, but fall is little, and microhardness is obvious ascendant trend.
Therefore adopt Al-5%Ti master alloy refinement fine aluminium technique of the present invention, namely interpolation waits channel deformation Al-5%Ti master alloy in commercial-purity aluminium liquid, can improve the refinement efficient of Al-5%Ti master alloy, the grain-size of technical pure aluminium ingot can reach below the 200 μ m, obtains preferably comprehensive physical mechanical property.
Grain size and microhardness under table 1 commercial-purity aluminium and embodiment 1～4 process for refining
Claims (5)
1. the method for an Al-Ti master alloy refinement commercial-purity aluminium the steps include:
1) under the room temperature Al-5%Ti master alloy is waited channel deformation;
The ceramic crucible that 2) will be placed with aluminium ingot and refining agent is put into pit furnace and is heated to 760 ℃ and makes it fusing;
3) will wait channel deformation Al-5%Ti master alloy to join in the aluminium liquid;
4) behind the stirring aluminium liquid, be warmed up to teeming temperature, and leave standstill insulation for some time;
5) aluminium liquid is poured in the swage, the demoulding, water-cooled are to room temperature.
2. the method for Al-Ti master alloy refinement commercial-purity aluminium according to claim 1, it is characterized in that: wait in the channel deformation process, mould interior angle Φ is 90～120 °, mould exterior angle Ψ is 0 °, sample is not all rotated in every time distortion, Deformation velocity 12mm/min, rolling pass are controlled in 3 passages.
3. Al-Ti master alloy refinement commercial-purity aluminium technique according to claim 1, it is characterized in that: the addition that waits channel deformation Al-5%Ti master alloy is 0.1～1% of fine aluminium weight.
4. Al-Ti master alloy refinement commercial-purity aluminium technique according to claim 1, it is characterized in that: teeming temperature is 720～800 ℃.
5. Al-Ti master alloy refinement commercial-purity aluminium technique according to claim 1 is characterized in that: aluminium liquid adds after master alloy stirs, heats up, and leaving standstill soaking time is 5～60 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104759958A CN102994788A (en) | 2012-11-21 | 2012-11-21 | Method for refining pure aluminum of Al-5% Ti intermediate alloy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627917A (en) * | 2013-11-05 | 2014-03-12 | 常州大学 | Method for refining commercially pure aluminum with aluminum-titanium interalloy |
| CN106591617A (en) * | 2016-12-22 | 2017-04-26 | 哈尔滨东盛金属材料有限公司 | Manganese additive for aluminum alloy and preparation method of manganese additive |
| CN115976373A (en) * | 2022-12-30 | 2023-04-18 | 中山瑞泰铝业有限公司 | Processing technology and application of aluminum alloy material |
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| US3785807A (en) * | 1970-04-28 | 1974-01-15 | Graenges Aluminium Ab | Method for producing a master alloy for use in aluminum casting processes |
| KR20060087077A (en) * | 2005-01-28 | 2006-08-02 | 학교법인 포항공과대학교 | Nano grained titanium alloy having low temperature superplasticity and manufacturing method of the same |
| KR20090118404A (en) * | 2008-05-13 | 2009-11-18 | 포항공과대학교 산학협력단 | Manufacturing method of aluminum alloy having good dynamic deformation properties |
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2012
- 2012-11-21 CN CN2012104759958A patent/CN102994788A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3785807A (en) * | 1970-04-28 | 1974-01-15 | Graenges Aluminium Ab | Method for producing a master alloy for use in aluminum casting processes |
| KR20060087077A (en) * | 2005-01-28 | 2006-08-02 | 학교법인 포항공과대학교 | Nano grained titanium alloy having low temperature superplasticity and manufacturing method of the same |
| KR20090118404A (en) * | 2008-05-13 | 2009-11-18 | 포항공과대학교 산학협력단 | Manufacturing method of aluminum alloy having good dynamic deformation properties |
Non-Patent Citations (2)
| Title |
|---|
| ZUOGUI ZHANG ET AL.: ""Grain refining performance for Al and Al–Si alloy casts by addition of equal-channel angular pressed Al–5 mass% Ti alloy"", 《MATERIALS SCIENCE AND ENGINEERING: A》, vol. 425, no. 12, 15 June 2006 (2006-06-15), pages 55 - 63 * |
| 刘国心等: ""等通道变形高纯铝的显微组织与力学性能"", 《机械工程材料》, vol. 32, no. 6, 30 June 2008 (2008-06-30), pages 66 - 69 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627917A (en) * | 2013-11-05 | 2014-03-12 | 常州大学 | Method for refining commercially pure aluminum with aluminum-titanium interalloy |
| CN103627917B (en) * | 2013-11-05 | 2016-04-13 | 常州大学 | A kind of method of aluminium titanium master alloy refinement commercial-purity aluminium |
| CN106591617A (en) * | 2016-12-22 | 2017-04-26 | 哈尔滨东盛金属材料有限公司 | Manganese additive for aluminum alloy and preparation method of manganese additive |
| CN115976373A (en) * | 2022-12-30 | 2023-04-18 | 中山瑞泰铝业有限公司 | Processing technology and application of aluminum alloy material |
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Application publication date: 20130327 |