CN103695675A - Method for changing morphology of Fe phase in Al-Mg-Si alloy - Google Patents
Method for changing morphology of Fe phase in Al-Mg-Si alloy Download PDFInfo
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- CN103695675A CN103695675A CN201310739432.XA CN201310739432A CN103695675A CN 103695675 A CN103695675 A CN 103695675A CN 201310739432 A CN201310739432 A CN 201310739432A CN 103695675 A CN103695675 A CN 103695675A
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Abstract
The invention relates to a method for changing morphology of a Fe phase in an Al-Mg-Si alloy, in particular to a method for controlling the morphology of the harmful element Fe phase in an aluminum alloy, and belongs to the technical field of metal alloy preparation. According to the method, an alloying element Ti is added into a melt to eliminate the harm of the Fe phase, and the prospect is broad; and besides change of the Fe phase morphology, the element Ti can react with a matrix Al to generate an intermetallic compound Al3Ti, so that the mechanical property of a material can be increased effectively, grains are refined, and no harmful effect is generated.
Description
Technical field
The present invention relates to a kind of method that Al-Mg-Si of change is associated Fe phase pattern in gold, specifically, for the morphological control method of aluminium alloy harmful element Fe phase, belong to metal alloy preparing technical field.
Background technology
Aluminium alloy has many good physicalies, as little in density, specific tenacity is high, good percentage elongation, the feature such as plasticity-is good, however in aluminium alloy, be inevitably accompanied with the Fe element of certain content, because the solubleness of Fe element in aluminium alloy is very low, therefore, in the tissue in the end solidifying, must form Al-Si-Fe phase, in Qi aluminum alloy organization mainly with α-Al
8siFe
2exist mutually, pattern is tip-like.When this makes aluminum substrate stressed, easily at needle point place, produce stress concentration, become formation of crack, material property is declined.Simultaneously in aluminum substrate deformation process due to α-Al
8siFe
2not only crisp but also hard mutually, make its needle point isolate matrix, impel crack propagation, thereby accelerated material failure.And generally in industrial production, the method for deironing has two kinds: a kind of is by dilution process, Fe content to be reduced, but the bad control of dilution, and also the harm of Fe phase can not be eliminated.Another kind is to adopt the method for filtering, and can effectively reduce the harm of Fe phase, but cost is too high, is unfavorable for scale operation.Therefore by adding alloying element Ti to eliminate the method that Fe endangers mutually in melt), its prospect is boundless.Ti element, except changing Fe phase pattern, can also react with matrix Al generation intermetallic compound Al
3ti, can effectively increase the mechanical property of material, crystal grain thinning.And can not produce detrimentally affect.
Summary of the invention
The object of the invention is to overcome above-mentioned weak point, facilitate, effectively reduce the damaging effect that Al-Mg-Si is associated Fe phase in gold, improve mechanical property and the resistance to corrosion of material.
According to technical scheme provided by the invention, change the method that Al-Mg-Si is associated Fe phase pattern in gold, step is: Al-Mg-Si is associated to gold fusing at 780-800 ℃, adds pure Ti powder, pure Ti powder: Fe mass ratio is 1 ~ 2:1; Speed with 400-500r/min stirs and is incubated, and holding temperature is 750-800 ℃, and soaking time is 10-20min, can be used for casting.
Described Al-Mg-Si is associated in gold, and the mass percent of each composition is: Si; 6.5%-7.5%, Mg:0.25%-0.45%, Fe<2%, Mn<0.05%, Zn<0.05%, Cu<0.1%, surplus is Al.
Alr mode is mechanical stirring, and blade and agitator arm surface-coated ZnO coating, prevent from introducing more Fe phase, and is baked to melt temperature before using, and prevents melt temperature rapid drawdown.
After Al-Mg-Si is alloy melting, adopt ZnCl
2solid or pure nitrogen gas carry out degasification to melt.
Alr mode is mechanical stirring, and blade and agitator arm surface-coated ZnO coating, prevent from introducing more Fe phase, and is baked to melt temperature before using.Prevent melt temperature rapid drawdown.
Melt degasification can be used ZnCl
2solid, also can be used pure nitrogen gas, air-breathing for removing the melt that the H element of melt and Yin Gaowen and stirring cause.
Alloy prepared by application the present invention, its Fe is by tip-like β-Al
5feSi is changed to Chinese character shape (or bone shape) α-Al
8siFe
2, effectively reduce the harm of Fe phase, and this invention using method being simple, the Ti adding is beneficial element to aluminium alloy, can not produce harm.
Beneficial effect of the present invention: the present invention endangers mutually by adding alloying element Ti to eliminate Fe in melt, and it has a extensive future; Ti element, except changing Fe phase pattern, can also react with matrix Al generation intermetallic compound Al
3ti, can effectively increase the mechanical property of material, crystal grain thinning.And can not produce detrimentally affect.
Accompanying drawing explanation
The alloy casting state metallographic microstructure figure of Fig. 1 comparative example 1.
The alloy casting state metallographic microstructure figure of Fig. 2 embodiment 1.
Embodiment
Embodiment 1
Al-Mg-Si is associated to gold fusing at 800 ℃, adds pure Ti powder, pure Ti powder: Fe mass ratio is 1:1; Speed with 400r/min stirs and is incubated, and holding temperature is 750 ℃, and soaking time is 20min, can be used for casting.
Use afterwards ZnCl
2degasification refining are skimmed, and then pour into copper mold, the cooling rear demoulding.The as cast condition metallographic microstructure figure of gained aluminium alloy is shown in accompanying drawing 2.
Described Al-Mg-Si is associated in gold, and the mass percent of each composition is: Si; 7.5%, Mg:0.45%, Fe<2%, Mn<0.05%, Zn<0.05%, Cu<0.1%, surplus is Al.
Embodiment 2
Al-Mg-Si is associated to gold fusing at 780 ℃, adds pure Ti powder, pure Ti powder: Fe mass ratio is 2:1; Speed with 400r/min stirs and is incubated, and holding temperature is 800 ℃, and soaking time is 10min, can be used for casting.
Described Al-Mg-Si is associated in gold, and the mass percent of each composition is: Si; 6.5%, Mg:0.25%, Fe<2%, Mn<0.05%, Zn<0.05%, Cu<0.1%, surplus is Al.
Embodiment 3
Al-Mg-Si is associated to gold fusing at 790 ℃, adds pure Ti powder, pure Ti powder: Fe mass ratio is 1.5:1; Speed with 450r/min stirs and is incubated, and holding temperature is 780 ℃, and soaking time is 10-20min, can be used for casting.
Described Al-Mg-Si is associated in gold, and the mass percent of each composition is: Si; 7%, Mg:0.35%, Fe<2%, Mn<0.05%, Zn<0.05%, Cu<0.1%, surplus is Al.
Comparative example 1
Al-Mg-Si alloy is put into graphite clay crucible, melting in resistance furnace, smelting temperature is 800 ℃, stirs, and be incubated 10min after fusing with mechanical stirring oar at 760 ℃.Use afterwards ZnCl
2degasification refining are skimmed, and then pour into copper mold, the cooling rear demoulding.The as cast condition metallographic microstructure figure of gained aluminium alloy is shown in accompanying drawing 1.
By comparative example 1(Fig. 1) and embodiment 1(Fig. 2).Ti element can be found to add and Fe phase pattern can be effectively changed.
Claims (4)
1. change the method that Al-Mg-Si is associated Fe phase pattern in gold, it is characterized in that step is: Al-Mg-Si is associated to gold fusing at 780-800 ℃, adds pure Ti powder, pure Ti powder: Fe mass ratio is 1 ~ 2:1; Speed with 400-500r/min stirs and is incubated, and holding temperature is 750-800 ℃, and soaking time is 10-20min, can be used for casting.
2. change as claimed in claim 1 the method that Al-Mg-Si is associated Fe phase pattern in gold, it is characterized in that: described Al-Mg-Si is associated in gold, the mass percent of each composition is: Si; 6.5%-7.5%, Mg:0.25%-0.45%, Fe<2%, Mn<0.05%, Zn<0.05%, Cu<0.1%, surplus is Al.
3. change as claimed in claim 1 the method that Al-Mg-Si is associated Fe phase pattern in gold, it is characterized in that: alr mode is mechanical stirring, blade and agitator arm surface-coated ZnO coating, prevent from introducing more Fe phase, and be baked to melt temperature before using, prevent melt temperature rapid drawdown.
4. change as claimed in claim 1 the method that Al-Mg-Si is associated Fe phase pattern in gold, it is characterized in that: after Al-Mg-Si is alloy melting, adopt ZnCl
2solid or pure nitrogen gas carry out degasification to melt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310739432.XA CN103695675B (en) | 2013-12-27 | 2013-12-27 | Change the method for Fe phase morphology in Al-Mg-Si system alloy |
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| CN201310739432.XA CN103695675B (en) | 2013-12-27 | 2013-12-27 | Change the method for Fe phase morphology in Al-Mg-Si system alloy |
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| CN103695675A true CN103695675A (en) | 2014-04-02 |
| CN103695675B CN103695675B (en) | 2015-10-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713041A (en) * | 2009-09-04 | 2010-05-26 | 广东华昌铝厂有限公司 | Novel Al-Mg-Si alloy |
| CN102758108A (en) * | 2012-06-19 | 2012-10-31 | 南昌大学 | Al-Si-Mg-Sm rare earth cast aluminum alloy and preparation method thereof |
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2013
- 2013-12-27 CN CN201310739432.XA patent/CN103695675B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713041A (en) * | 2009-09-04 | 2010-05-26 | 广东华昌铝厂有限公司 | Novel Al-Mg-Si alloy |
| CN102758108A (en) * | 2012-06-19 | 2012-10-31 | 南昌大学 | Al-Si-Mg-Sm rare earth cast aluminum alloy and preparation method thereof |
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Effective date of registration: 20190329 Address after: 414413 South of Zhensheng South Road, Recycling Economy Industrial Park, Miluo City, Yueyang City, Hunan Province Patentee after: Hunan Zhonglian Zhiyuan Wheel Co. Address before: 214106 Houqiao Middle East Village, Xishan District, Wuxi City, Jiangsu Province Patentee before: Jiangsu Zhonglian Aluminium Industry Co., Ltd. |
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