CN102719718A - Deformed magnesium alloy and casting method and deformation processing method thereof - Google Patents
Deformed magnesium alloy and casting method and deformation processing method thereof Download PDFInfo
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- CN102719718A CN102719718A CN201210222005XA CN201210222005A CN102719718A CN 102719718 A CN102719718 A CN 102719718A CN 201210222005X A CN201210222005X A CN 201210222005XA CN 201210222005 A CN201210222005 A CN 201210222005A CN 102719718 A CN102719718 A CN 102719718A
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Abstract
The invention relates to a deformed magnesium alloy and a casting method and a deformation processing method thereof. The deformed magnesium alloy comprises the following components in percentage by weight: 5.0 to 6.0 percent of Zn, 0.3 to 0.9 percent of Zr, 0.3 to 4.3 percent of Dy and the balance of Mg. The casting method for the magnesium alloy comprises the following steps of: raising the temperature to 730 DEG C under the protection of gas after Mg is melted, and adding Zn, a Mg-Zr intermediate alloy and a Mg-Dy intermediate alloy into a melt in sequence; adding a refining agent, stirring, raising the temperature to 750 to 760 DEG C, and standing for 30 minutes; and after the temperature of the melt is reduced to 715 DEG C, deslagging, and performing rapid solidification to obtain a casting blank. The deformation processing method for the magnesium alloy comprises the following steps of: performing homogenization treatment on the casting blank at the temperature of 400 DEG C, and performing forward extrusion under the conditions that the extrusion ratio is 40, extrusion temperature is 320 to 340 DEG C and extrusion speed is 1.5 to 2.5m/min. The defect of insufficient strength and plasticity of the conventional Mg-Zn-Zr series alloy is overcome, and the Mg-Zn-Zr-Dy alloy has a fine as-extruded structure and high room temperature and high temperature tensile mechanical properties.
Description
Technical field
The present invention relates to a kind of wrought magnesium alloys and casting method thereof and deformation processing method, specifically is a kind of wrought magnesium alloys and casting method and deformation processing method that adds REE Dy.
Background technology
Magnesiumalloy has advantages such as low density, high specific strength and specific rigidity, obtains increasingly extensive application in fields such as automobile, communication electronics and aerospace, becomes one of at present important high-strength light environmental protection structured material.Wrought magnesium alloys presents better ductility and over-all properties.High-strength ZK60 wrought magnesium alloys is to use one of more commercial magnesiumalloy at present, and its specific tenacity is strong 7075 duraluminums of superelevation, but its over-all properties still can not satisfy all application requiring, and mechanical property still awaits improving, particularly owing to MgZn in the tissue
2The phase fusing point is merely 347 ℃, causes its drawing by high temperature mechanical property relatively poor, and working temperature generally is no more than 150 ℃.Rare earth elements RE has unique configuration of extra-nuclear electron and chemical property; Can strengthen interatomic bond power, reduce atomic diffusion speed, form the compound of high thermal stability, can reduce the ingot casting microporosity simultaneously, reduce the alloy hot cracking tendency, improve alloy corrosion resistance and reduce alloy liquid oxidation scaling loss and reduce oxide inclusion defective etc.Therefore in magnesiumalloy, adding RE is the effective way that improves its heat resistance.
The patent of invention that the CN200410081258.5 name is called " a kind of high plastic magnesium alloy that contains the rare earth yttrium " discloses growing up through recrystal grain in the interpolation Rare Earth Y obstruction hot extrusion process in the ZK60 alloy; Further crystal grain thinning, thus keeping improving its plasticity under the alloy high strength condition.The Mg-of this invention (5.0～8.5) Zn-(0.7～2.0) Y-(0.6～0.8) Zr alloy extruding attitude average grain size is 5～8 4. m, and room temperature tensile strength is 322～337MPa, and unit elongation is 18～21.5%.
The CN200710011501.X name is called " effectively to be utilized rare earth element y reinforcement Mg-Zn-Y-Zr series magnesium alloy and preparing method's patent of invention to disclose through choosing rational Zn/Y than (6～15); the volumn concentration that will be incorporated into accurate crystalline phase in the Mg-Zn-Y-Zr alloy substrate reaches maximum, thereby makes the higher intensity of alloy acquisition and keeping plasticity preferably.The Mg-of this invention (5～30) Zn～(0.5～5) Y-(0.3～0.8) Zr alloy at room temperature tensile strength is 290～360MPa, and unit elongation is 10～18%.
Above-mentioned two patents all obtain good intensity and plasticity through adding Y, but alloy room temperature tensile mechanical property still remains to be improved, and are particularly keeping further improving intensity on the good plastic foundation.Both high Zn contents will cause hot cracking tendency to become serious, and not relate to the drawing by high temperature mechanical property, and the good high-temperature tensile mechanical properties will help to widen the Application of Magnesium field.
Summary of the invention
The objective of the invention is to overcome existing Mg-Zn-Zr is intensity and the plasticity deficiency that alloy exists, and proposes a kind of wrought magnesium alloys that improves intensity and plasticity.
Another object of the present invention provides a kind of casting method of said wrought magnesium alloys.
A further object of the present invention provides a kind of deformation processing method of said wrought magnesium alloys.
The component of wrought magnesium alloys according to the invention and weight percent thereof are: Zn5.0～6.0%, Zr0.3～0.9% and Dy0.3～4.3%, all the other are Mg.
The component of the wrought magnesium alloys of the best according to the invention and weight percent thereof are: Zn5.0%, Zr0.3% and Dy4.3%, all the other are Mg.
The casting method of wrought magnesium alloys according to the invention: at N
2And 0.2vol%SF
6Under mixed gas protected, treat to be warming up to 730 ℃ after the technical pure Mg fusing, every separated 5min adds technical pure Zn and Mg-Zr, Mg-Dy master alloy in the melt successively; In 1h, stir melt twice; Be warming up to 750～760 ℃ after adding the stirring of JDMJ type refining agent then, leave standstill 30min; Treat that at last melt temperature is cooled to 715 ℃, pour into after the slagging-off and force to be rapidly solidificated into strand in the cylindrical forming mould of refrigerative.
The deformation processing method of wrought magnesium alloys according to the invention: above-mentioned strand is handled 8h 400 ℃ of homogenizing, adopts the forward extrusion mode, and extrusion ratio is 40, and extrusion temperature is 320～340 ℃, and extrusion speed is 1.5～2.5m/min.
Mg-Zn-Zr-Dy wrought magnesium alloys of the present invention extruding attitude average grain size is 1～4 4. m; Room temperature tensile strength is up to 370～395MPa, and the tensile strength when unit elongation is 12～16.5%, 200 ℃ is 146～171MPa.
Dy belongs to heavy rare earth element; Add and generate HMP Mg-Zn-Zr-Dy quaternary system alloy phase in the Mg-Zn-Zr alloy; Promote the generation of dynamic recrystallization in the deformation processing process and suppress growing up of recrystal grain; Improve its room temperature and drawing by high temperature mechanical property, widen of the application of Mg-Zn-Zr series deformation magnesium alloy in fields such as automobile, communication electronics and aerospace.
The present invention, adds 0.3～0.9%Zr simultaneously and plays crystal grain thinning as basal component with 5.0～6.0%Zn, adds the strengthening phase Mg-Zn-Dy that 0.3～4.3%Dy forms high thermal stability, and lower melting point MgZn
2Reduce until completely dissolve gradually mutually.Reasonably casting method can guarantee the dissolving of REE effectively and reduce its scaling loss.Through rational deformation processing method; Like low temperature and large extrusion ratio etc.; Particle is by broken, refinement effectively mutually through strong strain extruding crystal grain and second, and second promotes the generation of dynamic recrystallization in the hot extrusion process mutually and suppress growing up of recrystal grain, forms the ultra-fine crystalline substance of micron order (1～4 4. m); Simultaneously tiny second plays the effect of strengthened dispersion alloy matrix and pinning crystal boundary mutually, effectively hinders the slippage of high temperature crystal boundary.Therefore Mg-Zn-Zr-Dy alloy of the present invention presents more tiny extruding attitude tissue, better room temperature and drawing by high temperature mechanical property.
Description of drawings
Fig. 1 is the extruding attitude optical microstructure photo of embodiment 3 alloys;
Fig. 2 is the extruding attitude scanning microstructure picture of embodiment 3 alloys;
Fig. 3 is the as cast condition XRD spectrum of embodiment 3 alloys.
Heating DSC curve when Fig. 4 is the as cast condition of embodiment 3 alloys etc.Peak temperature be respectively 458 ℃ with 555 ℃ the corresponding Mg-Zn-Dy of two endotherm(ic)peaks fusing mutually, peak temperature is the fusing of corresponding
matrix of endotherm(ic)peak of 637 ℃.
Embodiment
Content in conjunction with technical scheme of the present invention provides following three embodiment, but protection scope of the present invention is not limited to following three embodiment.
Embodiment 1
The weight percent of alloying constituent is: Zn5.5%, Zr0.6% and Dy0.3%, all the other are Mg.
Press the mentioned component alloyage, its casting method is: at N
2And 0.2vol%SF
6Under mixed gas protected, treat to be warming up to 730 ℃ after the technical pure Mg fusing, every separated 5min adds technical pure Zn and Mg-Zr, Mg-Dy master alloy in the melt successively; In 1h, stir melt twice; Be warming up to 750～760 ℃ after adding the stirring of JDMJ type refining agent then, leave standstill 30min; Treat that at last melt temperature is cooled to 715 ℃, pour into after the slagging-off and force to be rapidly solidificated into strand in the cylindrical forming mould of refrigerative.Its deformation processing method is: above-mentioned strand is handled 8h 400 ℃ of homogenizing, adopts the forward extrusion mode, and extrusion ratio is 40, and extrusion temperature is 320 ℃, and extrusion speed is 1.5m/min.
The extruding attitude average grain size of embodiment 1 has been reduced to 4 4. m; Room temperature tensile strength is increased to 370MPa, and unit elongation is 16.5%; Tensile strength when 150 ℃ and 200 ℃ is increased to 215 and 146MPa respectively.
Embodiment 2
The weight percent of alloying constituent is: Zn6.0%, Zr0.9% and Dy2.1%, all the other are Mg.
Press the mentioned component alloyage, its casting method is: at N
2And 0.2vol.%SF
6Under mixed gas protected, treat to be warming up to 730 ℃ after the technical pure Mg fusing, every separated 5min adds technical pure Zn and Mg-Zr, Mg-Dy master alloy in the melt successively; In 1h, stir melt twice; Be warming up to 750～760 ℃ after adding the stirring of JDMJ type refining agent then, leave standstill 30min; Treat that at last melt temperature is cooled to 715 ℃, pour into after the slagging-off and force to be rapidly solidificated into strand in the cylindrical forming mould of refrigerative.Its deformation processing method is: strand is handled 8h 400 ℃ of homogenizing, adopts the forward extrusion mode, and extrusion ratio is 40, and extrusion temperature is 330 ℃, and extrusion speed is 2.0m/min.
The extruding attitude average grain size of embodiment 2 is 2.5 4. m; Room temperature tensile strength is more up to 380MPa, and unit elongation is 14%; The tensile strength of 150 ℃ and 200 ℃ is respectively 220 and 157MPa.
Embodiment 3
The weight percent of alloying constituent is: Zn5.0%, Zr0.3% and Dy4.3%, all the other are Mg.
Press the mentioned component alloyage, its casting method is: at N
2And 0.2vol.%SF
6Under mixed gas protected, treat to be warming up to 730 ℃ after the technical pure Mg fusing, every separated 5min adds technical pure Zn and Mg-Zr, Mg-Dy master alloy in the melt successively; In 1h, stir melt twice; Be warming up to 750～760 ℃ after adding the stirring of JDMJ type refining agent then, leave standstill 30min; Treat that at last melt temperature is cooled to 715 ℃, pour into after the slagging-off and force to be rapidly solidificated into strand in the cylindrical forming mould of refrigerative.Its deformation processing method is: strand is handled 8h 400 ℃ of homogenizing, adopts the forward extrusion mode, and extrusion ratio is 40, and extrusion temperature is 340 ℃, and extrusion speed is 2.5m/min.
The average grain size of the extruding attitude alloy of embodiment 3 is merely 1 4. m; Room temperature tensile strength is more up to 395MPa, and unit elongation is 12%; The tensile strength of 150 ℃ and 200 ℃ is respectively 225 and 171MPa.
The extruding attitude average grain size and the tensile mechanical properties of embodiments of the invention and Comparative Examples are listed in the table 1.
The extruding attitude average grain size and the tensile mechanical properties of table 1 embodiment and Comparative Examples
*Comparative Examples 1:ZL200410081258.5; Comparative Examples 2:ZL200710011501.X
Claims (4)
1. wrought magnesium alloys, it is characterized in that component and weight percent thereof are: Zn5.0～6.0%, Zr0.3～0.9% and Dy0.3～4.3%, all the other are Mg.
2. wrought magnesium alloys according to claim 1 is characterized in that component and weight percent thereof are: Zn5.0%, Zr0.3% and Dy4.3%, all the other are Mg.
3. the casting method of the described wrought magnesium alloys of claim 1 is characterized in that at N
2And 0.2vol%SF
6Under mixed gas protected, treat to be warming up to 730 ℃ after the technical pure Mg fusing, every separated 5min adds technical pure Zn and Mg-Zr, Mg-Dy master alloy in the melt successively; In 1h, stir melt twice; Be warming up to 750～760 ℃ after adding the stirring of JDMJ type refining agent then, leave standstill 30min; Treat that at last melt temperature is cooled to 715 ℃, pour into after the slagging-off and force to be rapidly solidificated into strand in the cylindrical forming mould of refrigerative.
4. the deformation processing method of the described wrought magnesium alloys of claim 1: it is characterized in that above-mentioned strand handles 8h 400 ℃ of homogenizing, adopt the forward extrusion mode, extrusion ratio is 40, and extrusion temperature is 320～340 ℃, and extrusion speed is 1.5～2.5m/min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866170A (en) * | 2014-02-25 | 2014-06-18 | 广东省工业技术研究院(广州有色金属研究院) | Preparation method of rare earth magnesium alloy and sheet thereof |
| CN105603283A (en) * | 2016-03-31 | 2016-05-25 | 哈尔滨理工大学 | Method for preparing and forming high-strength high-toughness wrought magnesium alloy |
| CN108342630A (en) * | 2018-05-18 | 2018-07-31 | 句容百利镁合金材料科技有限公司 | The preparation method of magnesium alloy, the preparation method of magnesium alloy profiles and magnesium alloy rim |
| CN109930041A (en) * | 2018-12-25 | 2019-06-25 | 西安交通大学 | A kind of high-ductility in-situ nano particle reinforced magnesium base compound material and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105238978A (en) * | 2015-09-28 | 2016-01-13 | 天津东义镁制品股份有限公司 | Preparation method of high-strength magnesium alloy profile |
-
2012
- 2012-06-29 CN CN201210222005.XA patent/CN102719718B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 刘楚明等: "Dy和Y对ZK60镁合金铸态组织和力学性能的影响", 《中南大学学报(自然科学版)》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866170A (en) * | 2014-02-25 | 2014-06-18 | 广东省工业技术研究院(广州有色金属研究院) | Preparation method of rare earth magnesium alloy and sheet thereof |
| CN103866170B (en) * | 2014-02-25 | 2016-03-30 | 广东省工业技术研究院(广州有色金属研究院) | The preparation method of a kind of magnesium-rare earth and thin plate thereof |
| CN105603283A (en) * | 2016-03-31 | 2016-05-25 | 哈尔滨理工大学 | Method for preparing and forming high-strength high-toughness wrought magnesium alloy |
| CN105603283B (en) * | 2016-03-31 | 2017-07-07 | 哈尔滨理工大学 | A kind of method for preparing and shaping high-strength and high ductility wrought magnesium alloy |
| CN108342630A (en) * | 2018-05-18 | 2018-07-31 | 句容百利镁合金材料科技有限公司 | The preparation method of magnesium alloy, the preparation method of magnesium alloy profiles and magnesium alloy rim |
| CN109930041A (en) * | 2018-12-25 | 2019-06-25 | 西安交通大学 | A kind of high-ductility in-situ nano particle reinforced magnesium base compound material and preparation method thereof |
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