CN105714168A - High-yield-strength magnesium alloy and preparation method thereof - Google Patents
High-yield-strength magnesium alloy and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- 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 relates to a high-yield-strength magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by weight: 5-7% of Zn, 1.0-1.5% of Al, 0.2-0.4% of Mn, 0.3-0.7% of Ca, and the balance of Mg. Zinc and a small amount of aluminum are added in the magnesium alloy; the adding of zinc and aluminum can provide the effects of solution strengthening and precipitation strengthening for the magnesium alloy; the preparation method emphasizes control of the adding quantity of aluminum, and is combined with a semicontinuous ingot preparation method, so that the zinc and aluminum elements in the obtained ingot form uniformly distributed t(Mg32(Al,Zn)49) phases, but not thick delta phases, the microsegregation of the ingot is relieved, the quality of initial microstructure is improved, the better foundation is laid for improvement of subsequent material solution and aging precipitation effect, and the material is finally high in mechanical performance. The added calcium has a refining effect on magnesium alloy grains and precipitated structures, so that the plasticity and the yield strength of the alloy material are further improved.
Description
Technical field
The present invention relates to technical field of magnesium alloy material, refer specifically to a kind of high-yield strength magnesium alloy, the preparation method that the invention still further relates to above-mentioned high-yield strength magnesium alloy.
Background technology
Within 1774, magnesium be it is found that first, it has high specific strength, specific stiffness, excellent damping capacity and the plurality of advantages such as antimagnetic, shielding, heat radiation, Cutting free processing, easy recovery, is applied to the vehicles such as automobile, motorcycle, computer, communication, instrument and meter, household electrical appliances, metallurgy, Aero-Space, defence and military etc. widely at present.But, owing to the absolute intensity of magnesium alloy is low, limit its further application in structural material field.
Yield strength is to weigh an important parameter of material property, in material tensile deformation process, when stress exceedes yield point, permanent expendable plastic deformation will be produced, make workpiece generation permanent deformation, it is impossible to continue to meet instructions for use, potential safety hazard even occurs.Therefore for mechanical component material, except requiring higher tensile strength, yield strength is also a kind of important index, and yield strength is more high, it is meant that the security intensity of material is more big, and component is more safe.
The Chinese invention patent " a kind of high-yield-ratio wrought magnesium alloy containing cerium Yu yttrium " (application number: 201410210886.2) that Authorization Notice No. is CN103952613B discloses a kind of material, in this material, the interpolation of rare earth element can effectively improve the yield strength of magnesium alloy, but, also greatly improve the cost of magnesium alloy, limit the application of material.
Therefore, for current magnesium alloy materials and preparation method thereof, await doing further improvement.
Summary of the invention
The technical problem to be solved is the present situation for prior art, it is provided that the magnesium alloy that a kind of plasticity is good, yield strength is high and cost is low.
To be solved by this invention another technical problem is that the present situation for prior art, it is provided that the preparation method of a kind of magnesium alloy, and magnesium alloy yield strength prepared by the method effectively improves, and all other mechanical properties also substantially rise.
This invention address that the technical scheme that above-mentioned technical problem adopts is: a kind of high-yield strength magnesium alloy, it is characterised in that: by weight percentage, described magnesium alloy includes following components
The Mg of surplus.
In such scheme, the impurity content in described magnesium alloy is Fe≤0.01%, Cu≤0.01%, Ni≤0.005%；Zn/Al mass ratio is more than 4, to ensure to occur without thick Φ (Mg in alloy21(Al,Zn)17) phase.
The preparation method of above-mentioned high-yield strength magnesium alloy, it is characterised in that comprise the following steps:
(1) alloy melting and casting
At SF6+CO2Under gas shield, technical pure magnesium ingot is placed in electrical crucible and heats, after dissolving, be warming up to 730～750 DEG C, slag hitting, it is subsequently adding technical pure zinc ingot metal, and is pressed into below magnesium melt liquid level, stirring 5～10min after zinc ingot metal melts；Add aluminium ingot, aluminum manganese intermediate alloy and magnesium calcium intermediate alloy, stir after fusing, stand 1～2h；
Regulate temperature to 720～740 DEG C, carry out refine with refining agent, slag hitting after refine, then at 700 DEG C～720 DEG C, carry out semicontinuous ingot casting；
(2) homogenization heat treatment
The ingot casting that step (1) obtains is sawn to suitable dimension, then carries out homogenization heat treatment；With lathe by stand-by for ingot casting appearance car light after heat treatment；
(3) hot extrusion
The blank that mould and step (2) obtain being preheating to 250～300 DEG C, carries out hot extrusion, extrusion temperature is 250～300 DEG C, extrusion ratio >=10, and extrusion speed is 100～200mm/min；
(4) Ageing Treatment
The bar that extruding obtains is carried out artificial aging process, after being disposed, namely obtains described high-yield strength magnesium alloy.
In such scheme, described aluminum manganese intermediate alloy is Al-25%Mn intermediate alloy, and described magnesium calcium intermediate alloy is Mg-30%Ca intermediate alloy.
As preferably, the heat treated temperature of described homogenization is 330 DEG C, and temperature retention time is 12～24h, air cooling after insulation.The aging temp of described Ageing Treatment is 160 DEG C, and aging time is 24～30h.
Compared with prior art, it is an advantage of the current invention that:
The present invention with the addition of zinc and a small amount of aluminum in the magnesium alloy, zinc, aluminum interpolation magnesium alloy can be provided solution strengthening, precipitation strength effect, and the present invention highlights the addition controlling aluminum, this is owing to controlling zinc/aluminum mass ratio the semicontinuous ingot casting preparation method in conjunction with the present invention in the present invention, the zinc in gained ingot casting, aluminium element can be made to form equally distributed τ (Mg32(Al,Zn)49) phase, rather than thickPhase so that the microsegregation of ingot casting alleviates, the Quality advance of initial microstructure, good basis is established in the raising for subsequent material solid solution Yu Precipitation effect, it is ensured that final material has high mechanical property；
Meanwhile, magnesium alloy crystal grain and precipitation tissue are had refining effect by the calcium added in the present invention, thus improving plasticity and the yield strength of alloy material further；
Additionally, the addition element of the present invention is less costly, significantly lower than ZK60 alloy, (in ZK60 alloy, Zr adds difficulty to finally prepd magnesium alloy materials cost, loss is big, the manufacturing cost causing this alloy remains high), with existing AZ80 alloy (ZK60A-T5 yield strength 285MPa, percentage elongation 11%；AZ80A-T5 yield strength 275MPa, percentage elongation 7%) cost suitable.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of resulting materials after step (1) casting in the embodiment of the present invention 1；
Fig. 2 is the comparison chart of the TEM of last resulting materials in the embodiment of the present invention 1 and precipitated phase.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment 1:
By weight percentage, the high-yield strength magnesium alloy of the present embodiment includes following components Zn6%, Al1.2%, Mn0.3%, Ca0.4% and the Mg of surplus；Impurity content in magnesium alloy is Fe≤0.01%, Cu≤0.01%, Ni≤0.005%.
The preparation method of above-mentioned high-yield strength magnesium alloy comprises the following steps:
(1) alloy melting and casting
At SF6+CO2Under gas shield, technical pure magnesium ingot is placed in electrical crucible and heats, after dissolving, be warming up to 750 DEG C, slag hitting, it is subsequently adding technical pure zinc ingot metal, technical pure zinc ingot metal is pressed into rapidly below magnesium melt liquid level, stirring 10min after zinc ingot metal melts；Add aluminium ingot, aluminum manganese intermediate alloy and magnesium calcium intermediate alloy, stir after fusing, stand 1.5h；Aluminum manganese intermediate alloy is Al-25%Mn intermediate alloy, and described magnesium calcium intermediate alloy is Mg-30%Ca intermediate alloy；
Regulate temperature to 730 DEG C, carry out refine with refining agent, slag hitting after refine, at 700 DEG C, then carry out semicontinuous ingot casting；
(2) homogenization heat treatment
The ingot casting that step (1) obtains being sawn to suitable dimension, then carries out homogenization heat treatment, the heat treated temperature of homogenization is 330 DEG C, and temperature retention time is 12h, air cooling after insulation；With lathe by stand-by for ingot casting appearance car light after heat treatment；
(3) hot extrusion
The blank that mould and step (2) obtain being preheating to 250 DEG C, carries out hot extrusion, extrusion temperature is 300 DEG C, extrusion ratio 12, and extrusion speed is 150mm/min；
(4) Ageing Treatment
The bar that extruding obtains is carried out artificial aging process, and aging temp is 160 DEG C, and aging time is 24h；Namely high-yield strength magnesium alloy is obtained after being disposed.
As shown in Figure 1, 2, material precipitated phase prepared by the present embodiment is extremely tiny, is conducive to improving the yield strength of material.
Embodiment 2:
By weight percentage, the high-yield strength magnesium alloy of the present embodiment includes following components Zn6.5%, Al1.5%, Mn0.4%, Ca0.5% and the Mg of surplus；Impurity content in magnesium alloy is Fe≤0.01%, Cu≤0.01%, Ni≤0.005%.
The preparation method of above-mentioned high-yield strength magnesium alloy comprises the following steps:
(1) alloy melting and casting
At SF6+CO2Under gas shield, technical pure magnesium ingot is placed in electrical crucible and heats, after dissolving, be warming up to 730 DEG C, slag hitting, it is subsequently adding technical pure zinc ingot metal, technical pure zinc ingot metal is pressed into rapidly below magnesium melt liquid level, stirring 8min after zinc ingot metal fusing；Add aluminium ingot, aluminum manganese intermediate alloy and magnesium calcium intermediate alloy, stir after fusing, stand 2h；Aluminum manganese intermediate alloy is Al-25%Mn intermediate alloy, and described magnesium calcium intermediate alloy is Mg-30%Ca intermediate alloy；
Regulate temperature to 740 DEG C, carry out refine with refining agent, slag hitting after refine, at 720 DEG C, then carry out semicontinuous ingot casting；
(2) homogenization heat treatment
The ingot casting that step (1) obtains being sawn to suitable dimension, then carries out homogenization heat treatment, the heat treated temperature of homogenization is 330 DEG C, and temperature retention time is 24h, air cooling after insulation；With lathe by stand-by for ingot casting appearance car light after heat treatment；
(3) hot extrusion
The blank that mould and step (2) obtain being preheating to 250 DEG C, carries out hot extrusion, extrusion temperature is 250 DEG C, extrusion ratio 10, and extrusion speed is 100mm/min；
(4) Ageing Treatment
The bar that extruding obtains is carried out artificial aging process, and aging temp is 160 DEG C, and aging time is 30h；Namely high-yield strength magnesium alloy is obtained after being disposed.
Embodiment 3:
By weight percentage, the high-yield strength magnesium alloy of the present embodiment includes following components Zn5.5%, Al1.0%, Mn0.2%, Ca0.7% and the Mg of surplus；Impurity content in magnesium alloy is Fe≤0.01%, Cu≤0.01%, Ni≤0.005%.
The preparation method of above-mentioned high-yield strength magnesium alloy comprises the following steps:
(1) alloy melting and casting
At SF6+CO2Under gas shield, technical pure magnesium ingot is placed in electrical crucible and heats, after dissolving, be warming up to 740 DEG C, slag hitting, it is subsequently adding technical pure zinc ingot metal, technical pure zinc ingot metal is pressed into rapidly below magnesium melt liquid level, stirring 5min after zinc ingot metal fusing；Add aluminium ingot, aluminum manganese intermediate alloy and magnesium calcium intermediate alloy, stir after fusing, stand 1h；Aluminum manganese intermediate alloy is Al-25%Mn intermediate alloy, and described magnesium calcium intermediate alloy is Mg-30%Ca intermediate alloy；
Regulate temperature to 730 DEG C, carry out refine with refining agent, slag hitting after refine, at 700 DEG C, then carry out semicontinuous ingot casting；
(2) homogenization heat treatment
The ingot casting that step (1) obtains being sawn to suitable dimension, then carries out homogenization heat treatment, the heat treated temperature of homogenization is 330 DEG C, and temperature retention time is 20h, air cooling after insulation；With lathe by stand-by for ingot casting appearance car light after heat treatment；
(3) hot extrusion
The blank that mould and step (2) obtain being preheating to 270 DEG C, carries out hot extrusion, extrusion temperature is 280 DEG C, extrusion ratio 12, and extrusion speed is 200mm/min；
(4) Ageing Treatment
The bar that extruding obtains is carried out artificial aging process, and aging temp is 160 DEG C, and aging time is 24h；Namely high-yield strength magnesium alloy is obtained after being disposed.
Embodiment 4:
By weight percentage, the high-yield strength magnesium alloy of the present embodiment includes following components Zn5%, Al1.0%, Mn0.2%, Ca0.3% and the Mg of surplus；Impurity content in magnesium alloy is Fe≤0.01%, Cu≤0.01%, Ni≤0.005%.
The preparation method of above-mentioned high-yield strength magnesium alloy comprises the following steps:
(1) alloy melting and casting
At SF6+CO2Under gas shield, technical pure magnesium ingot is placed in electrical crucible and heats, after dissolving, be warming up to 730 DEG C, slag hitting, it is subsequently adding technical pure zinc ingot metal, technical pure zinc ingot metal is pressed into rapidly below magnesium melt liquid level, stirring 5min after zinc ingot metal fusing；Add aluminium ingot, aluminum manganese intermediate alloy and magnesium calcium intermediate alloy, stir after fusing, stand 1h；Aluminum manganese intermediate alloy is Al-25%Mn intermediate alloy, and described magnesium calcium intermediate alloy is Mg-30%Ca intermediate alloy；
Regulate temperature to 740 DEG C, carry out refine with refining agent, slag hitting after refine, at 720 DEG C, then carry out semicontinuous ingot casting；
(2) homogenization heat treatment
The ingot casting that step (1) obtains being sawn to suitable dimension, then carries out homogenization heat treatment, the heat treated temperature of homogenization is 330 DEG C, and temperature retention time is 12h, air cooling after insulation；With lathe by stand-by for ingot casting appearance car light after heat treatment；
(3) hot extrusion
The blank that mould and step (2) obtain being preheating to 300 DEG C, carries out hot extrusion, extrusion temperature is 300 DEG C, extrusion ratio 12, and extrusion speed is 150mm/min；
(4) Ageing Treatment
The bar that extruding obtains is carried out artificial aging process, and aging temp is 160 DEG C, and aging time is 24h；Namely high-yield strength magnesium alloy is obtained after being disposed.
Embodiment 5:
By weight percentage, the high-yield strength magnesium alloy of the present embodiment includes following components Zn7%, Al1.5%, Mn0.4%, Ca0.7% and the Mg of surplus；Impurity content in magnesium alloy is Fe≤0.01%, Cu≤0.01%, Ni≤0.005%.
The preparation method of above-mentioned high-yield strength magnesium alloy comprises the following steps:
(1) alloy melting and casting
At SF6+CO2Under gas shield, technical pure magnesium ingot is placed in electrical crucible and heats, after dissolving, be warming up to 740 DEG C, slag hitting, it is subsequently adding technical pure zinc ingot metal, technical pure zinc ingot metal is pressed into rapidly below magnesium melt liquid level, stirring 10min after zinc ingot metal fusing；Add aluminium ingot, aluminum manganese intermediate alloy and magnesium calcium intermediate alloy, stir after fusing, stand 2h；Aluminum manganese intermediate alloy is Al-25%Mn intermediate alloy, and described magnesium calcium intermediate alloy is Mg-30%Ca intermediate alloy；
Regulate temperature to 730 DEG C, carry out refine with refining agent, slag hitting after refine, at 710 DEG C, then carry out semicontinuous ingot casting；
(2) homogenization heat treatment
The ingot casting that step (1) obtains being sawn to suitable dimension, then carries out homogenization heat treatment, the heat treated temperature of homogenization is 330 DEG C, and temperature retention time is 24h, air cooling after insulation；With lathe by stand-by for ingot casting appearance car light after heat treatment；
(3) hot extrusion
The blank that mould and step (2) obtain being preheating to 280 DEG C, carries out hot extrusion, extrusion temperature is 290 DEG C, extrusion ratio 10, and extrusion speed is 200mm/min；
(4) Ageing Treatment
The bar that extruding obtains is carried out artificial aging process, and aging temp is 160 DEG C, and aging time is 30h；Namely high-yield strength magnesium alloy is obtained after being disposed.
Magnesium alloy AZ31 and ZK60 on above-described embodiment 1～3 gained magnesium alloy materials and existing market is carried out Mechanics Performance Testing, and test result is as shown in table 1.
It can be seen that compared with existing magnesium alloy AZ31 and ZK60, the magnesium alloy prepared by the present invention is obviously improved in every mechanical property.
Table 1
| Alloy | Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage (%) |
| AZ31 | 195-205 | 255-265 | 12-14 5 --> |
| ZK60 | 240-250 | 325-335 | 10-12 |
| Embodiment 1 | 317 | 358 | 16.5 |
| Embodiment 2 | 316 | 355 | 17.5 |
| Embodiment 3 | 307 | 350 | 18.0 |
Claims (7)
1. a high-yield strength magnesium alloy, it is characterised in that: by weight percentage, described magnesium alloy includes following components
The Mg of surplus.
2. high-yield strength magnesium alloy according to claim 1, it is characterised in that: the impurity content in described magnesium alloy is Fe≤0.01%, Cu≤0.01%, Ni≤0.005%.
3. high-yield strength magnesium alloy according to claim 1, it is characterised in that: in described magnesium alloy, Zn/Al mass ratio is more than 4.
4. the preparation method of high-yield strength magnesium alloy described in a claim 1 or 2 or 3, it is characterised in that comprise the following steps:
(1) alloy melting and casting
At SF6+CO2Under gas shield, technical pure magnesium ingot is placed in electrical crucible and heats, after dissolving, be warming up to 730～750 DEG C, slag hitting, it is subsequently adding technical pure zinc ingot metal, stirring 5～10min after zinc ingot metal fusing；Add aluminium ingot, aluminum manganese intermediate alloy and magnesium calcium intermediate alloy, stir after fusing, stand 1～2h；
Regulate temperature to 720～740 DEG C, carry out refine with refining agent, slag hitting after refine, then at 700 DEG C～720 DEG C, carry out semicontinuous ingot casting；
(2) homogenization heat treatment
The ingot casting that step (1) obtains is sawn to suitable dimension, then carries out homogenization heat treatment；With lathe by stand-by for ingot casting appearance car light after heat treatment；
(3) hot extrusion
The blank that mould and step (2) obtain being preheating to 250～300 DEG C, carries out hot extrusion, extrusion temperature is 250～300 DEG C, extrusion ratio >=10, and extrusion speed is 100～200mm/min；
(4) Ageing Treatment
The bar that extruding obtains is carried out artificial aging process, after being disposed, namely obtains described high-yield strength magnesium alloy.
5. the preparation method of high-yield strength magnesium alloy according to claim 4, it is characterised in that: described aluminum manganese intermediate alloy is Al-25%Mn intermediate alloy, and described magnesium calcium intermediate alloy is Mg-30%Ca intermediate alloy.
6. the preparation method of high-yield strength magnesium alloy according to claim 4, it is characterised in that: the heat treated temperature of described homogenization is 330 DEG C, and temperature retention time is 12～24h, air cooling after insulation.
7. the preparation method of high-yield strength magnesium alloy according to claim 4, it is characterised in that: the aging temp of described Ageing Treatment is 160 DEG C, and aging time is 24～30h.
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| CN106282814A (en) * | 2016-08-15 | 2017-01-04 | 合肥万向钱潮汽车零部件有限公司 | A kind of anti abrasive automobile lathe |
| CN107058838A (en) * | 2017-06-13 | 2017-08-18 | 济南大学 | A kind of mechanism during warm deformation Biological magnesium alloy and preparation method thereof |
| CN107177762A (en) * | 2017-05-18 | 2017-09-19 | 湖南金戈新材料有限责任公司 | The secondary hot extrusion technique of AQ80M magnesium alloy profiles |
| CN108251773A (en) * | 2018-02-08 | 2018-07-06 | 四川理工学院 | A kind of pressing method and product for preparing high-strength and high ductility wrought magnesium alloy |
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| CN107177762A (en) * | 2017-05-18 | 2017-09-19 | 湖南金戈新材料有限责任公司 | The secondary hot extrusion technique of AQ80M magnesium alloy profiles |
| CN107058838A (en) * | 2017-06-13 | 2017-08-18 | 济南大学 | A kind of mechanism during warm deformation Biological magnesium alloy and preparation method thereof |
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| CN108642346B (en) * | 2018-07-10 | 2019-12-13 | 青岛土木建工集团有限公司 | high-strength high-temperature-resistant aluminum alloy building material and production method thereof |
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| CN112442621A (en) * | 2020-11-04 | 2021-03-05 | 长沙新材料产业研究院有限公司 | Magnesium alloy plate and preparation method thereof |
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| CN114855043A (en) * | 2022-05-09 | 2022-08-05 | 吉林大学 | Superfine crystal high-strength plastic magnesium alloy and preparation method thereof |
| CN114921700A (en) * | 2022-05-25 | 2022-08-19 | 中南大学 | Biodegradable Mg-Zn-Ca-Re alloy |
| CN114934218A (en) * | 2022-05-25 | 2022-08-23 | 鹤壁海镁科技有限公司 | Microalloyed high-strength plastic flame-retardant magnesium alloy and preparation method thereof |
| CN114934218B (en) * | 2022-05-25 | 2023-09-05 | 鹤壁海镁科技有限公司 | Microalloyed high-strength plastic flame-retardant magnesium alloy and preparation method thereof |
| CN114921700B (en) * | 2022-05-25 | 2023-09-26 | 中南大学 | Biodegradable Mg-Zn-Ca-Re alloy |
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