CN102409209A - Method for compositely refining AZ31 magnesium alloy crystal particles by ultrasound field and refining agent - Google Patents
Method for compositely refining AZ31 magnesium alloy crystal particles by ultrasound field and refining agent Download PDFInfo
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- CN102409209A CN102409209A CN2011104002746A CN201110400274A CN102409209A CN 102409209 A CN102409209 A CN 102409209A CN 2011104002746 A CN2011104002746 A CN 2011104002746A CN 201110400274 A CN201110400274 A CN 201110400274A CN 102409209 A CN102409209 A CN 102409209A
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Abstract
The invention provides a method for compositely refining AZ31 magnesium alloy crystal particles by an ultrasound field and a refining agent and belongs to the technical field of magnesium alloy casting. The method is characterized by comprising the following steps of: firstly, melting an AZ31 magnesium alloy under the protection of a magnesium alloy fusing agent; adding the refining agent consisting of SiC ceramic particles and magnesium powder when the temperature is raised to 780 DEG C, wherein the addition amount of the refining agent is 0.2%-1% by mass of magnesium alloy melt; after insulating for 20 minutes, stirring so that the refining agent is dispersed in the melt; after further insulating for 10 minutes, refining with argon; and applying the ultrasound field at the temperature of 680 DEG C-700 DEG C to process for 2 minutes and then pouring. The method has the beneficial effects of simple operation process, low production cost and good AZ31 magnesium alloy refining effect; and by using the method, the strength and toughness of the AZ31 magnesium alloy are obviously improved.
Description
Technical field
The invention belongs to the magnesium alloy cast technical field, relate to the method for a kind of ultrasonic field and fining agent composite refining AZ31 magnesiumalloy crystal grain.
Background technology
The AZ31 magnesiumalloy is one of the most frequently used magnesiumalloy, has high specific tenacity, specific rigidity, advantages such as good castability and machining property.But the liquid-solid temperature range of AZ31 magnesiumalloy is big at interval, is prone to produce defectives such as shrinkage porosite, pore, crackle in the process of setting.In addition, thick crystal grain has also caused the mechanical property of this alloy lower, has limited it and has used widely.
Grain refinement technology can effectively be improved casting flaw, improves the intensity and the toughness of alloy.The magnesium alloy grains method can be divided into chemical method and physics method.Chemical method is that the physics method is to come the refinement magnesiumalloy through applying outfields such as ultrasonic field and EM field through interpolation grain-refining agent or alloying element.People such as Mark A Easton are on " Scripta Materialia "; 55 (2006) 379-382; Deliver document " Grain refinement of Mg-Al (Mn) alloys by SiC additions " and point out that the SiC particulate has good thinning effect to the Mg-A1 alloy; But SiC particle and magnesium alloy fused mass wettability are poor, are difficult for being introduced in the magnesiumalloy, though the document adopts the Mg-SiC master alloy of seepage with free surface method preparation to solve the wettability problem; But preparation technology's relative complex, cost is higher.
Summary of the invention
The present invention provides a kind of method of easy, effective refinement AZ31 magnesiumalloy crystal grain, adopts UW that the SiC ceramic particle is incorporated in the AZ31 magnesium alloy fused mass.Solution SiC ceramic particle and the problem that Mg matrix wettability is poor, difficulty adds.
Technical scheme of the present invention is: is uniform mixing after to be pressed into piece at 1: 2 with SiC ceramic particle and Mg powder by mass ratio, and fining agent is processed in oven dry; The SiC ceramic particle is of a size of the 2-3 micron, and briquetting power is 10-15MPa, and bake out temperature is not for being higher than 300 ℃; With RJ-2 flux protection fusing AZ31 magnesiumalloy; Be warmed up to the fining agent that adds magnesium alloy fused mass massfraction 0.2%-1% after 780 ℃, keep stirring after 20 minutes, continue to keep blowing argon gas refining after 10 minutes; Carry out supersound process in the time of 680 ℃-700 ℃, cast immediately after the supersound process; Power during the supersound process magnesium alloy fused mass is 350 watts, and the treatment time is 2 minutes.
Effect of the present invention is to compare with other methods of adding SiC with benefit, and operating procedure is simple, and production cost is low, and ultrasonic field has been improved the wettability of SiC and Mg melt, has improved the specific absorption of SiC, impels SiC uniform distribution in melt.Simultaneously do not introduce other heterogeneous elements yet, very little to the composition influence of magnesiumalloy.The inventive method is to the good in refining effect of AZ31 magnesiumalloy, and its intensity and toughness are significantly improved.
Description of drawings
Fig. 1 is the micro-organization chart that does not add the AZ31 magnesiumalloy of fining agent.
Fig. 2 is the AZ31 magnesiumalloy micro-organization chart after ultrasonic field and the SiC fining agent Combined Processing.
Embodiment
Be described in detail embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
(1) preheated crucible and alloy material, crucible add about 600 gram Mg when being heated to 500 ℃, Mg fusing back adds Al-10Mn, the Zn of corresponding content, and the RJ-2 insulating covering agent has been spread on the surface.
(2) melt temperature is raised to 780 ℃, will be pressed in the magnesium alloy fused mass by the block fining agent (massfraction is 0.5%) that SiC and Mg form, be incubated 20 minutes with bell jar.
(3) magnesium alloy fused mass is stirred, make block fining agent scatter fully, continue insulation 10 minutes again.
(4) with argon gas refining 2 minutes, cool to 680 ℃ then and add ultrasonic field, ultrasonic power is 350 watts, handles cast after 2 minutes.
Can find out that from Fig. 1 and Fig. 2 contrast thinning method of the present invention is refinement AZ31 magnesiumalloy crystal grain significantly.
Claims (1)
1. the method for ultrasonic field and fining agent composite refining AZ31 magnesiumalloy crystal grain is characterized in that, is uniform mixing after to be pressed into piece at 1: 2 with SiC ceramic particle and Mg powder by mass ratio, and the SiC ceramic particle is of a size of the 2-3 micron, and fining agent is processed in oven dry; Briquetting power is 10-15MPa, and bake out temperature is not for being higher than 300 ℃; With flux protection fusing AZ31 magnesiumalloy, be warmed up to that to add the magnesium alloy fused mass massfraction after 780 ℃ be the fining agent of 0.2%-1%, keeps stirring after 20 minutes, continue to keep blowing argon gas refining after 10 minutes, pour into a mould immediately after 680 ℃ of-700 ℃ of supersound process; Power during the supersound process magnesium alloy fused mass is 350 watts, and the treatment time is 2 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104002746A CN102409209A (en) | 2011-12-05 | 2011-12-05 | Method for compositely refining AZ31 magnesium alloy crystal particles by ultrasound field and refining agent |
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| CN2011104002746A CN102409209A (en) | 2011-12-05 | 2011-12-05 | Method for compositely refining AZ31 magnesium alloy crystal particles by ultrasound field and refining agent |
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| CN102409209A true CN102409209A (en) | 2012-04-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523184A (en) * | 2021-06-08 | 2021-10-22 | 上海航天精密机械研究所 | Magnesium alloy sand mold casting method |
| CN114293054A (en) * | 2021-12-08 | 2022-04-08 | 大连理工大学 | Grain refiner suitable for magnesium alloys with different aluminum contents and preparation method thereof |
| CN114369741A (en) * | 2022-01-04 | 2022-04-19 | 湖南化工职业技术学院（湖南工业高级技工学校） | SiC inoculation treatment process of Mg-3.0Zn medical magnesium alloy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532098A (en) * | 2009-04-22 | 2009-09-16 | 南昌大学 | Method for preparing SiCp/AZ31 magnesium-based nano composite material using ultrasonic wave |
| CN101608277A (en) * | 2009-06-02 | 2009-12-23 | 大连理工大学 | A kind of electromagnetic/ultrasonic preparation method of in-situ particle reinforced magnesium-based composite material |
| CN101818276A (en) * | 2009-03-14 | 2010-09-01 | 兰州理工大学 | Method for refining magnesium alloy grains |
| CN101851716A (en) * | 2010-06-14 | 2010-10-06 | 清华大学 | Magnesium base composite material and preparation method thereof, and application thereof in sounding device |
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2011
- 2011-12-05 CN CN2011104002746A patent/CN102409209A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818276A (en) * | 2009-03-14 | 2010-09-01 | 兰州理工大学 | Method for refining magnesium alloy grains |
| CN101532098A (en) * | 2009-04-22 | 2009-09-16 | 南昌大学 | Method for preparing SiCp/AZ31 magnesium-based nano composite material using ultrasonic wave |
| CN101608277A (en) * | 2009-06-02 | 2009-12-23 | 大连理工大学 | A kind of electromagnetic/ultrasonic preparation method of in-situ particle reinforced magnesium-based composite material |
| CN101851716A (en) * | 2010-06-14 | 2010-10-06 | 清华大学 | Magnesium base composite material and preparation method thereof, and application thereof in sounding device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113523184A (en) * | 2021-06-08 | 2021-10-22 | 上海航天精密机械研究所 | Magnesium alloy sand mold casting method |
| CN114293054A (en) * | 2021-12-08 | 2022-04-08 | 大连理工大学 | Grain refiner suitable for magnesium alloys with different aluminum contents and preparation method thereof |
| CN114293054B (en) * | 2021-12-08 | 2022-12-02 | 大连理工大学 | Grain refiner suitable for magnesium alloys with different aluminum contents and preparation method thereof |
| CN114369741A (en) * | 2022-01-04 | 2022-04-19 | 湖南化工职业技术学院（湖南工业高级技工学校） | SiC inoculation treatment process of Mg-3.0Zn medical magnesium alloy |
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Application publication date: 20120411 |