CN100347331C - Method for AZ61 magnesium alloy semi-solid blank - Google Patents
Method for AZ61 magnesium alloy semi-solid blank Download PDFInfo
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- CN100347331C CN100347331C CNB2005100639478A CN200510063947A CN100347331C CN 100347331 C CN100347331 C CN 100347331C CN B2005100639478 A CNB2005100639478 A CN B2005100639478A CN 200510063947 A CN200510063947 A CN 200510063947A CN 100347331 C CN100347331 C CN 100347331C
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Abstract
The present invention relates to a method for preparing AZ61 semi-solid magnesium alloy blanks. The present invention is composed of a predeformation technical process and an isothermal heat treatment technical process. The present invention is characterized in that the predeformation heating temperature is from 300 DEG C to 400 DEG C, the deformation is controlled within the range of 5% to 42%, and then a flame-retardant measure is adopted; isothermal heat treatment is carried out, the heating temperature is from 570 DEG C to 610 DEG C, and the holding time is from 0 min to 40 min. The AZ61 semi-solid magnesium alloy blank prepared by the method of the present invention is characterized in that the spherical grain structure is small and fine, the roundness is good, most diameters of equiareal circles of the grain structure are from 90 um to 150 um, the roundness of the grain structure is mainly within the range of 1.2 to 1.8, the requirements of subsequent thixotopic formation can be completely satisfied, and the present invention has simple process, high safety and reliability and no three-waste pollution.
Description
Technical field
The invention belongs to metallic substance forming technique field, relate to the preparation method of magnesium alloy semi-solid state blank.
Background technology
In recent years, along with the development of magnesium alloy production technology, Application of Magnesium has obtained people's very big concern.Especially the application aspect structured material has obtained great attention, and the past magnesium alloy mainly is to be used for metallurgy industry, and the application aspect structured material only is confined to a small amount of requirement of space flight and aviation aspect.Now, along with widespread use of semi-solid-state metal processing technology and popularization, and the develop rapidly of automobile making, aerospace, communication, opticinstrument and computer realm, magnesium alloy is considered to the commercial light material that 21st century has application and DEVELOPMENT PROSPECT most as the extremely common people's concern of a kind of ideal Industrial materials.The Application and Development of magnesium alloy has become the focus of current material area research.
Magnesium alloy commonly used has: AZ91, AZ61, AZ31 etc.The AZ91 alloy is a cast magnesium alloys, and the AZ31 alloy is a wrought magnesium alloys, and the AZ61 alloy is that wrought magnesium alloys also can be used as cast magnesium alloys.Therefore, AZ61 has good intensity, plasticity and corrosion resistant comprehensive mechanical property, simultaneously, also has advantages of good casting, is fit to semi-solid-state shaping.The invention provides a kind of preparation AZ61 magnesium alloy semi-solid state blank method.
At present, the Chang Yong method for preparing semi-solid blank has: mechanical mixing method, electromagnetic stirring method and strain-induced melt activation method SIMA (Strain Induced Melt Activation) etc.The SIMA method is compared with other method owing to avoided the metal liquid treatment step, and technology is simple, the cost of equipment less investment.Therefore, more and more be subjected to people's attention.
Summary of the invention
It is preparation AZ61 magnesium alloy semi-solid state blank method that the object of the invention is to provide a kind of employing SIMA method.
The present invention realizes by following operation.
At first blank is processed in the turning of AZ61 as cast condition bar, carrying out predeformation then handles, the predeformation Heating temperature is 300 ℃～400 ℃, after making blank temperature reach unanimity, the distortion of on pressing machine, exerting pressure, deflection is controlled at 5%～42%, realizes that AZ61 magnesium alloy tissue develops into equiax crystal or short dendritic crystal process gradually by dendritic crystalline substance.Isothermal thermal treatment Heating temperature is 570 ℃～610 ℃, soaking time≤40min, and in this process, taking appropriate measures prevents magnesium alloy from oxidative combustion (fire-retardant).Impel equiax crystal or short dendritic crystal in the blank to develop into globular structure, thereby obtain AZ61 semi-solid magnesium alloy blank.
Predeformation of the present invention is with 350 ℃～390 ℃ of Heating temperatures, and deflection 20%～40% is best.
Isothermal thermal treatment of the present invention is with 585 ℃～595 ℃ of Heating temperatures, and soaking time 30min～40min is best.
The method that prevents magnesium alloy from oxidative combustion of the present invention can adopt the method that feeds argon gas, also can cover graphite on the magnesium alloy blank and prevent its oxidizing fire.The latter compares with the former, has simplified production unit, has reduced productive expense.
This method adopts predeformation to handle, and realizes that AZ61 magnesium alloy tissue develops into equiax crystal or short dendritic crystal gradually by dendritic crystalline substance, and a dendrite appearance is cataclasm, distortion and alligatoring.Alloy is after preheating distortion, and intragranular produces a large amount of dislocations, and the crystal boundary total area increases, and the system free energy is increased.And in process air cooler, take place to reply and recrystallize, make a dendrite cataclasm.For further reduction system free energy, the secondary dendrite arm merges grows up.Be out of shape greatly more, the motivating force of above-mentioned evolution is big more, and answer and recrystallize and secondary dendrite arm merge to grow up and more easily carry out.
The present invention carries out isothermal thermal treatment in the semi-solid temperature interval, and along with the raising of temperature and soaking time prolong, the kinetic energy of atom increases on the one hand, make dislocation climb and slippage is easy to carry out, promote the diffusion of atom.On the other hand, dislocation provides passage easily for heat activated atom.Original crystal boundary place low melting point eutectic is organized at first fusing, impels the drift of crystal grain, and constipation lumps together the generation macrobead when thermodynamic condition is ripe.And along with holding time prolonging, most of particle develops into approximate circle spheric particle.
The AZ61 magnesium alloy semi-solid state blank that preparation method of the present invention prepares, its spheric grain is organized tiny, shaped degree is better, the equalarea-circle diameter major part of its grain structure is between 90um～150um, and the circularity of grain structure is mainly in 1.2～1.8 scopes, satisfy the requirement of its thixotropic forming fully, and technology is simple, safe and reliable, three-waste free pollution.
Description of drawings
Fig. 1 is the formed AZ61 magnesium alloy semi-solid state blank of the embodiment of the invention 1 a described technological process organization chart.
Fig. 2 is the formed AZ61 magnesium alloy semi-solid state blank of the embodiment of the invention 2 a described technological processs organization chart.
Fig. 3 is the formed AZ61 magnesium alloy semi-solid state blank of the embodiment of the invention 3 a described technological processs organization chart.
Fig. 4 is the formed AZ61 magnesium alloy semi-solid state blank of the embodiment of the invention 4 a described technological processs organization chart.
(figure a) and the scatter chart of circularity (scheming b) for the equalarea-circle diameter of the AZ61 magnesium alloy semi-solid state blank tissue of the present invention preparation for Fig. 5, the X-coordinate of wherein scheming a is equivalance diameter d/μ m, ordinate zou is primary phase per-cent λ/%, the X-coordinate of figure b is circularity a, and ordinate zou is primary phase per-cent λ/%.
Embodiment
The present invention will be further described by following examples.
At first with AZ61 as cast condition blank heating to 370 ℃, insulation 40min carries out predeformation then and handles, deflection is controlled at 40%, carries out isothermal thermal treatment again, and it is fire-retardant to cover graphite, 585 ℃ of Heating temperatures behind the soaking time 20min, can obtain AZ61 semi-solid magnesium alloy blank.
At first with AZ61 as cast condition blank heating to 350 ℃, insulation 50min carries out predeformation then and handles, deflection is controlled at 22%, carries out isothermal thermal treatment again, and it is fire-retardant to cover graphite, 595 ℃ of Heating temperatures behind the soaking time 40min, can obtain AZ61 semi-solid magnesium alloy blank.
Embodiment 3.
At first with AZ61 as cast condition blank heating to 300 ℃, insulation 30min, predeformation is handled then, and deflection is controlled at 5%, carries out isothermal thermal treatment again, and it is fire-retardant to feed argon gas, 610 ℃ of Heating temperatures, soaking time 0min can obtain AZ61 semi-solid magnesium alloy blank.
Embodiment 4.
At first with AZ61 as cast condition blank heating to 380 ℃, insulation 35min, predeformation is handled then, deflection is controlled at 16%, carries out isothermal thermal treatment again, and it is fire-retardant to cover graphite, after 592 ℃ of the Heating temperatures, behind the soaking time 35min, can obtain AZ61 semi-solid magnesium alloy blank.
Claims (3)
1, a kind of preparation method of AZ61 magnesium alloy semi-solid state blank, form by the heating predeformation under 300 ℃～400 ℃ temperature, the isothermal thermal treatment under the fire-retardant state, the deflection that it is characterized in that predeformation is controlled at 5%～42%, 570 ℃～610 ℃ of isothermal thermal treatment Heating temperatures, soaking time 30min～40min.
2, preparation method according to claim 1 is characterized in that predeformation amount is controlled at 20%～40%.
3, preparation method according to claim 1 is characterized in that 585 ℃～595 ℃ of isothermal thermal treatment Heating temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100639478A CN100347331C (en) | 2005-03-28 | 2005-03-28 | Method for AZ61 magnesium alloy semi-solid blank |
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| CNB2005100639478A CN100347331C (en) | 2005-03-28 | 2005-03-28 | Method for AZ61 magnesium alloy semi-solid blank |
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| CN1654699A CN1654699A (en) | 2005-08-17 |
| CN100347331C true CN100347331C (en) | 2007-11-07 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424218C (en) * | 2007-07-11 | 2008-10-08 | 华中科技大学 | Magnesium alloy casting semi solid-state heat treatment method |
| CN103128255A (en) * | 2011-11-22 | 2013-06-05 | 中国兵器工业第五九研究所 | Die and method used for preparing magnesium alloy semisolid blank |
| CN102489870A (en) * | 2011-12-13 | 2012-06-13 | 重庆大学 | Method for preparing thixomolding plate blank |
| CN103233190B (en) * | 2013-05-02 | 2015-06-03 | 昆明理工大学 | Method for preparing semisolid blank |
| CN109202031A (en) * | 2018-10-25 | 2019-01-15 | 成都先进金属材料产业技术研究院有限公司 | The preparation method of the automobile-used alloy semi-solid blank of predeformation |
| CN111663090A (en) * | 2020-05-25 | 2020-09-15 | 珠海中科先进技术研究院有限公司 | Preparation method of medical magnesium-based composite material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998033610A1 (en) * | 1997-01-31 | 1998-08-06 | Amcan Castings Limited | Semi-solid metal forming process |
| CN1540027A (en) * | 2003-04-21 | 2004-10-27 | �ִ��Զ�����ʽ���� | Mfg. method of Mg alloyed blank for thixotropic forming |
| CN1566395A (en) * | 2003-06-30 | 2005-01-19 | 哈尔滨工业大学 | Composite preparation method for isothermal spherocrystallization semisolid blank from magnesium alloy by diameter variable curve extrusion pressing and shearing induction |
-
2005
- 2005-03-28 CN CNB2005100639478A patent/CN100347331C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998033610A1 (en) * | 1997-01-31 | 1998-08-06 | Amcan Castings Limited | Semi-solid metal forming process |
| CN1540027A (en) * | 2003-04-21 | 2004-10-27 | �ִ��Զ�����ʽ���� | Mfg. method of Mg alloyed blank for thixotropic forming |
| CN1566395A (en) * | 2003-06-30 | 2005-01-19 | 哈尔滨工业大学 | Composite preparation method for isothermal spherocrystallization semisolid blank from magnesium alloy by diameter variable curve extrusion pressing and shearing induction |
Non-Patent Citations (4)
| Title |
|---|
| AZ61镁合金热变形行为的研究 周海涛，马春江，刘满平，等.2002年材料科学与工程新进展（上）.2002年中国材料研讨会论文集 2002 * |
| SIMA法处理AZ91D镁合金压缩形变及半固态等温组织的特征 姚亮宇，袁森，王武孝，等.中国有色金属学报，第14卷第4期 2004 * |
| Superplasticity Enhanced by Two-stage Deformation inaHot-extruded AZ61 Magnesium Alloy. Yinong WANG、J.C.Huang.Journal of Materials Science & Technology,Vol.21 No.1. 2005 * |
| 静磁场作用下镁合金AZ61凝固过程研究 许光明，包卫平，郑佳伟，等.稀有金属，第28卷第1期 2004 * |
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