CN103695675B - Change the method for Fe phase morphology in Al-Mg-Si system alloy - Google Patents
Change the method for Fe phase morphology in Al-Mg-Si system alloy Download PDFInfo
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- CN103695675B CN103695675B CN201310739432.XA CN201310739432A CN103695675B CN 103695675 B CN103695675 B CN 103695675B CN 201310739432 A CN201310739432 A CN 201310739432A CN 103695675 B CN103695675 B CN 103695675B
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Abstract
The present invention relates to a kind of method changing Fe phase morphology in Al-Mg-Si system alloy, specifically for the morphological control method of harmful element Fe phase in aluminium alloy, belong to technical field of metallic alloy preparation.The present invention eliminates Fe phase endanger by adding alloying element Ti in melt, and it has a extensive future; Ti element, except changing Fe phase morphology, can also react with matrix Al and generate intermetallic compound Al
3ti, effectively can increase the mechanical property of material, crystal grain thinning.And can not detrimentally affect be produced.
Description
Technical field
The present invention relates to a kind of method changing Fe phase morphology in Al-Mg-Si system alloy, specifically for the morphological control method of harmful element Fe phase in aluminium alloy, belong to technical field of metallic alloy preparation.
Background technology
Aluminium alloy has many good physicalies, as density is little, specific tenacity is high, good percentage elongation, the features such as plasticity-is good, but 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 solidified, must form Al-Si-Fe phase, it is main with α-Al in aluminum alloy organization
8siFe
2exist mutually, pattern is tip-like.Time this makes aluminum substrate stressed, easily produce stress concentration at needle point place, 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, thus accelerate material failure.And generally in the industrial production, the method for deironing has two kinds: one makes Fe content reduce by dilution process, but the bad control of dilution, and also the harm of Fe phase can not be eliminated.Another kind adopts the method for filtering, and effectively can reduce the harm of Fe phase, but cost is too high, is unfavorable for scale operation.Therefore eliminate by adding alloying element Ti in melt the method that Fe phase endangers), its prospect is boundless.Ti element, except changing Fe phase morphology, can also react with matrix Al and generate intermetallic compound Al
3ti, effectively can increase the mechanical property of material, crystal grain thinning.And can not detrimentally affect be produced.
Summary of the invention
The object of the invention is to overcome above-mentioned weak point, convenient, to effectively reduce Fe phase in Al-Mg-Si system alloy damaging effect, improve mechanical property and the resistance to corrosion of material.
According to technical scheme provided by the invention, change the method for Fe phase morphology in Al-Mg-Si system alloy, step is: melted at 780-800 DEG C by Al-Mg-Si system alloy, adds pure Ti powder, pure Ti powder: Fe mass ratio is 1 ~ 2:1; Stir with the speed of 400-500r/min and be incubated, holding temperature is 750-800 DEG C, and soaking time is 10-20min, namely can be used for casting.
In described Al-Mg-Si system alloy, 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, blade and agitator arm surface-coated ZnO coating, prevents from introducing more Fe phase, and is baked to melt temperature before the use, prevent melt temperature rapid drawdown.
After Al-Mg-Si system alloy melting, adopt ZnCl
2solid or pure nitrogen gas carry out degasification to melt.
Alr mode is mechanical stirring, blade and agitator arm surface-coated ZnO coating, prevents from introducing more Fe phase, and is baked to melt temperature before the use.Prevent melt temperature rapid drawdown.
Melt degasification can use ZnCl
2solid, also can use pure nitrogen gas, for removing the melt air-breathing that H element in melt and Yin Gaowen and stirring cause.
Alloy prepared by application the present invention, its Fe phase 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 is simple, the Ti added is beneficial element concerning aluminium alloy, can not produce harm.
Beneficial effect of the present invention: the present invention eliminates Fe phase endanger by adding alloying element Ti in melt, and it has a extensive future; Ti element, except changing Fe phase morphology, can also react with matrix Al and generate intermetallic compound Al
3ti, effectively can increase the mechanical property of material, crystal grain thinning.And can not detrimentally affect be produced.
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 system alloy is melted at 800 DEG C, adds pure Ti powder, pure Ti powder: Fe mass ratio is 1:1; Stir with the speed of 400r/min and be incubated, holding temperature is 750 DEG C, and soaking time is 20min, namely can be used for casting.
Use ZnCl afterwards
2degasification refining are skimmed, and then pour into copper mold, the demoulding after cooling.The as cast condition metallographic microstructure figure of gained aluminium alloy is shown in accompanying drawing 2.
In described Al-Mg-Si system alloy, 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 system alloy is melted at 780 DEG C, adds pure Ti powder, pure Ti powder: Fe mass ratio is 2:1; Stir with the speed of 400r/min and be incubated, holding temperature is 800 DEG C, and soaking time is 10min, namely can be used for casting.
In described Al-Mg-Si system alloy, 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 system alloy is melted at 790 DEG C, adds pure Ti powder, pure Ti powder: Fe mass ratio is 1.5:1; Stir with the speed of 450r/min and be incubated, holding temperature is 780 DEG C, and soaking time is 10-20min, namely can be used for casting.
In described Al-Mg-Si system alloy, 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 DEG C, stirs, and be incubated 10min after fusing with mechanical stirring oar at 760 DEG C.Use ZnCl afterwards
2degasification refining are skimmed, and then pour into copper mold, the demoulding after cooling.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).Can find that adding Ti element can effectively change Fe phase morphology.
Claims (3)
1. change the method for Fe phase morphology in Al-Mg-Si system alloy, it is characterized in that step is: melted at 780-800 DEG C by Al-Mg-Si system alloy, add pure Ti powder, pure Ti powder: Fe mass ratio is 1 ~ 2:1; Stir with the speed of 400-500r/min and be incubated, holding temperature is 750-800 DEG C, and soaking time is 10-20min, namely can be used for casting;
After Al-Mg-Si system alloy melting, adopt ZnCl
2solid or pure nitrogen gas carry out degasification to melt.
2. change the method for Fe phase morphology in Al-Mg-Si system alloy as claimed in claim 1, it is characterized in that: in described Al-Mg-Si system alloy, 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 the method for Fe phase morphology in Al-Mg-Si system alloy as claimed in claim 1, it is characterized in that: alr mode is mechanical stirring that blade and agitator arm surface-coated ZnO coating prevent from introducing more Fe phase, and be baked to melt temperature before the use, prevent melt temperature rapid drawdown.
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| CN103695675A CN103695675A (en) | 2014-04-02 |
| CN103695675B true 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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