CN105483483A - Deforming rare earth magnesium alloy and preparing method thereof - Google Patents
Deforming rare earth magnesium alloy and preparing method thereof Download PDFInfo
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- CN105483483A CN105483483A CN201510884711.4A CN201510884711A CN105483483A CN 105483483 A CN105483483 A CN 105483483A CN 201510884711 A CN201510884711 A CN 201510884711A CN 105483483 A CN105483483 A CN 105483483A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
The invention discloses a deforming rare earth magnesium alloy. The deforming rare earth magnesium alloy is prepared from, by mass, 0.45%-0.68% of composite rare earth Y, 4.7%-5.4% of Zn, 0.39%-0.44% of Zr, 0.015% or less of impurity elements silicon, iron, copper and nickel and the balance Mg. A preparing method of the deforming rare earth magnesium alloy includes the following steps that 1, the raw materials are preheated; 2, under the protection of SF6/CO2, the Mg is melted, and then the Zn is added and melted; 3, the mixture is heated to 700 DEG C to 740 DEG C, and a Mg-Y intermediate alloy is added and melted; 4, the mixture is heated to 740 DEG C to 770 DEG C, a Mg-Zr intermediate alloy is added, the mixture is stirred, and refining and precipitating are carried out under the argon protecting condition after slag removing; 5, a round magnesium alloy bar is manufactured; and 6, after the round magnesium alloy bar is cut, the magnesium alloy is extruded and formed. The preparing method is simple and easy to operate, the strength of the obtained magnesium alloy at the room temperature is higher than 400 MPa, and the elongation of the obtained magnesium alloy is higher than 19%.
Description
Technical field
The present invention relates to alloy field, particularly relate to a kind of deformable rare earth magnesium alloy and preparation method thereof.
Background technology
Because magnesium alloy industry technology is still immature, limit the ratio that wrought magnesium alloys is shared in the magnesium alloy, be usually less than 10%, this is far below the ratio of deforming alloy in the industries such as iron and steel, aluminium, copper.Therefore, magnesium alloy industry has very large technology and improves space and profit margin.
Alloy system conventional in wrought magnesium alloys shows Mg-Mn (MB1, MB8, MB14 etc.), Mg-Al (MB2, MB3, MB7 etc.) and Mg-Zn-Zr (MB15, MB21, MB22, MB25 etc.).MB1 has good corrosion resistance nature, but intensity is not high.MB8 adds Rare-Earth Ce element on the basis of MB2, and crystal grain obtains refinement, and intensity is improved.MB14 is the content increasing Ce element on the basis of MB8 further, and the intensity of alloy is improved further.MB3 and MB7 researches and develops on the basis of MB2, with the addition of AL or Zn in the magnesium alloy and obtains.The intensity of MB3 and MB7 compares MB2 to be increased to some extent, but plasticity reduces greatly.Research finds, appropriate rare earth can improve the overall performance of magnesium alloy.MB15 belongs to Mg-Zn-Zr series, is a kind of high-strength alloy.The content of Zr is generally 0.6-0.8%, the content (being no more than 4.5%) of strict control Zn.Domestic normal employing MB21 (Zn content is lower), alloy has excellent overall performance.According to Zn content in alloy number, Mg-Zn-Zr series is divided into high zinc alloy and low zinc alloy two kinds, MB21 and MB22 belongs to low zinc alloy, and MB15 and MB25 belongs to high zinc alloy, and MB25 is more than MB15 containing Rare Earth Y.
The performance of Mg-Zn-Zr series alloy by adopting multiple schedule of reinforcement to improve weave construction, but these enhancement methods cannot carry heavy alloyed all properties simultaneously, and the overall performance of alloy is improved.Describe known by above-mentioned, in traditional magnesium alloy, add appropriate rare earth element is a kind of effective way improving alloy strength, and simultaneously rare earth element also can put forward heavy alloyed resistance to elevated temperatures.
At present, the mode of single rare earth (such as, Nd, Y, La, Ce etc.) always adds in magnesium alloy by scientific research department and manufacturer.Although rare earth element can significantly improve a certain performance of alloy, the action effect of different rare earths to performance is different, and therefore, the overall performance resulting improvement effect of alloy is unbalanced.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of deformable rare earth magnesium alloy and preparation method thereof, it adopts mishmetal to replace traditional single Y rare earth, effectively can improve the overall performance of magnesium alloy.
For this reason, technical program of the present invention lies in:
A kind of deformable rare earth magnesium alloy, component and mass percent are: compound rare-earth Y:0.45-0.68%, Zn:4.7-5.4%, Zr:0.39-0.44%, and impurity elemental silicon, iron, copper and mickel content are 0.015% or less, and rest part is Mg.
The preparation method of deformable rare earth magnesium alloy described above, comprises the steps:
1) by the component of deformable rare earth magnesium alloy described in claim 1, Mg, Zn, Mg-Zr master alloy and Mg-Y master alloy are distinguished preheating;
2) at SF
6/ CO
2under gas shield condition, by magnesium heat fused in crucible, then add zinc, treat that zinc melts;
3) be warming up to 700 ~ 740 DEG C, add Mg-Y master alloy, treat that it melts;
4) be warming up to 740 ~ 770 DEG C, add Mg-Zr master alloy, stir; After slagging-off under argon shield condition refining 20 ~ 30min, precipitation 50 ~ 60min;
5) 700 ~ 740 DEG C time, the method for water cooled mo(u)ld manufacture or semicontinuous casting is adopted to process magnesium alloy pole;
6) by after described magnesium alloy pole cutting, 350-400 DEG C of extrusion molding.
Preferably, also comprising step 6) described magnesium alloy pole is between cutting first under 460-490 DEG C of condition, and solution treatment 3 ~ 4h, then just carries out cutting, extruding shaping technique.
Preferably, step 1) preheating temperature is 250-300 DEG C.
Contriver studies discovery, adopts mishmetal Y to replace traditional single Y rare earth, effectively can improve the overall performance of magnesium alloy.This is because except containing except Y rare earth in mishmetal Y, also containing other rare earths such as Ho, Er, wherein Er rare earth effectively can improve the ductility of magnesium alloy.
The deformable rare earth magnesium alloy that the present invention obtains has the following advantages:
(1) magnesium alloy of experimental study has the intensity of 400MPa or higher in room temperature, and the elongation of 19% or higher, overall performance is significantly improved.And traditional magnesium alloy to be single aspect performance higher, overall performance is on the low side, has obvious shortcoming.
(2) according to different processing requirements, water cooled mo(u)ld manufacture or semicontinuous casting are carried out to the magnesium alloy after melting, obtain ground Magnesium Alloy crystal grain and reduce by 25% relative to employing conventional casting techniques.
(3) in this experiment, the manufacturing process of magnesium alloy is simple, easy to operate.
Embodiment
Below in conjunction with being that embodiment is described in detail technical scheme of the present invention.
Embodiment 1
The composition (weight percent) of deformable rare earth magnesium alloy is: Zn:5.0%, Zr:0.4%, and compound rare-earth Y:0.5%, impurity elemental silicon, iron, copper and mickel content are less than 0.015%, and rest part is Mg.
In the present embodiment, the preparation method of deformable rare earth magnesium alloy comprises the steps:
(1) by magnesium, zinc, magnesium-zirconium master alloy and magnesium-yttrium master alloy respectively 250 DEG C of preheatings;
(2) at SF
6/ CO
2under gas shield condition, by magnesium heat fused in crucible, then add zinc, treat that zinc melts;
(3) be warming up to 700 DEG C, add Mg-Y master alloy, treat that it melts;
(4) be warming up to 740 DEG C, add Mg-Zr master alloy, stir; After slagging-off under argon shield condition refining 30min, precipitation 50min;
(5) 700 DEG C time, the method for water cooled mo(u)ld manufacture or semicontinuous casting is adopted to process magnesium alloy pole;
(6) by after the cutting of described magnesium alloy pole, first under 460 DEG C of conditions, solution treatment 4h, then 350 DEG C of extrusion moldings.
A kind of deformable rare earth magnesium alloy of the present embodiment gained, its microtexture and room-temperature mechanical property are:
Grain-size: 6 μm
Tensile strength: 457MPa
Unit elongation: 30%
Embodiment 2
The composition (weight percent) of deformable rare earth magnesium alloy is: Zn:5.4%, Zr:0.39%, and compound rare-earth Y:0.45%, impurity elemental silicon, iron, copper and mickel content are less than 0.015%, and rest part is Mg.
In the present embodiment, the preparation method of deformable rare earth magnesium alloy comprises the steps:
(1) by magnesium, zinc, magnesium-zirconium master alloy and magnesium-yttrium master alloy respectively 270 DEG C of preheatings;
(2) at SF
6/ CO
2under gas shield condition, by magnesium heat fused in crucible, then add zinc, treat that zinc melts;
(3) be warming up to 720 DEG C, add Mg-Y master alloy, treat that it melts;
(4) be warming up to 760 DEG C, add Mg-Zr master alloy, stir; After slagging-off under argon shield condition refining 20min, precipitation 45min;
(5) 730 DEG C time, the method for water cooled mo(u)ld manufacture or semicontinuous casting is adopted to process magnesium alloy pole;
(6) by after described magnesium alloy pole cutting, then 370 DEG C of extrusion moldings.
A kind of deformable rare earth magnesium alloy of the present embodiment gained, its microtexture and room-temperature mechanical property are:
Grain-size: 11 μm
Tensile strength: 412MPa
Unit elongation: 22%
Embodiment 3
The composition (weight percent) of deformable rare earth magnesium alloy is: Zn:4.7%, Zr:0.44%, and compound rare-earth Y:0.68%, impurity elemental silicon, iron, copper and mickel content are less than 0.015%, and rest part is Mg.
In the present embodiment, the preparation method of deformable rare earth magnesium alloy comprises the steps:
(1) by magnesium, zinc, magnesium-zirconium master alloy and magnesium-yttrium master alloy respectively 290 DEG C of preheatings;
(2) at SF
6/ CO
2under gas shield condition, by magnesium heat fused in crucible, then add zinc, treat that zinc melts;
(3) be warming up to 735 DEG C, add Mg-Y master alloy, treat that it melts;
(4) be warming up to 760 DEG C, add Mg-Zr master alloy, stir; After slagging-off under argon shield condition refining 23min, precipitation 45min;
(5) 740 DEG C time, the method for water cooled mo(u)ld manufacture or semicontinuous casting is adopted to process magnesium alloy pole;
(6) by after described magnesium alloy pole cutting, 400 DEG C of extrusion moldings.
A kind of deformable rare earth magnesium alloy of the present embodiment gained, its microtexture and room-temperature mechanical property are:
Grain-size: 10 μm
Tensile strength: 427MPa
Unit elongation: 26%
Embodiment 4
The composition (weight percent) of deformable rare earth magnesium alloy is: Zn:5.2%, Zr:0.42%, and compound rare-earth Y:0.55%, impurity elemental silicon, iron, copper and mickel content are less than 0.015%, and rest part is Mg.
In the present embodiment, the preparation method of deformable rare earth magnesium alloy comprises the steps:
(1) by magnesium, zinc, magnesium-zirconium master alloy and magnesium-yttrium master alloy respectively 300 DEG C of preheatings;
(2) at SF
6/ CO
2under gas shield condition, by magnesium heat fused in crucible, then add zinc, treat that zinc melts;
(3) be warming up to 740 DEG C, add Mg-Y master alloy, treat that it melts;
(4) be warming up to 770 DEG C, add Mg-Zr master alloy, stir; After slagging-off under argon shield condition refining 28min, precipitation 60min;
(5) 740 DEG C time, the method for water cooled mo(u)ld manufacture or semicontinuous casting is adopted to process magnesium alloy pole;
(6) by after the cutting of described magnesium alloy pole, first under 480 DEG C of conditions, solution treatment 3h, then 370 DEG C of extrusion moldings.
A kind of deformable rare earth magnesium alloy of the present embodiment gained, its microtexture and room-temperature mechanical property are:
Grain-size: 8 μm
Tensile strength: 437MPa
Unit elongation: 27%.
Claims (4)
1. a deformable rare earth magnesium alloy, it is characterized in that component and mass percent are: compound rare-earth Y:0.45-0.68%, Zn:4.7-5.4%, Zr:0.39-0.44%, impurity elemental silicon, iron, copper and mickel content are 0.015% or less, and rest part is Mg.
2. the preparation method of deformable rare earth magnesium alloy as claimed in claim 1, is characterized in that comprising the steps:
1) by the component of deformable rare earth magnesium alloy described in claim 1, Mg, Zn, Mg-Zr master alloy and Mg-Y master alloy are distinguished preheating;
2) at SF
6/ CO
2under gas shield condition, by magnesium heat fused in crucible, then add zinc, treat that zinc melts;
3) be warming up to 700 ~ 740 DEG C, add Mg-Y master alloy, treat that it melts;
4) be warming up to 740 ~ 770 DEG C, add Mg-Zr master alloy, stir; After slagging-off under argon shield condition refining 20 ~ 30min, precipitation 50 ~ 60min;
5) 700 ~ 740 DEG C time, the method for water cooled mo(u)ld manufacture or semicontinuous casting is adopted to process magnesium alloy pole;
6) by after described magnesium alloy pole cutting, 350-400 DEG C of extrusion molding.
3. the preparation method of deformable rare earth magnesium alloy as claimed in claim 2, is characterized in that: step 6) described magnesium alloy pole is between cutting first under 460-490 DEG C of condition, and solution treatment 3 ~ 4h, then just carries out cutting, extruding shaping technique.
4. the preparation method of deformable rare earth magnesium alloy as described in Claims 2 or 3, is characterized in that: step 1) preheating temperature is 250-300 DEG C.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182149A (en) * | 2021-11-15 | 2022-03-15 | 季华实验室 | Magnesium alloy and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114182149A (en) * | 2021-11-15 | 2022-03-15 | 季华实验室 | Magnesium alloy and preparation method thereof |
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Application publication date: 20160413 |
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