CN103849798B - A kind of cast Mg alloy with high strength and preparation method thereof - Google Patents
A kind of cast Mg alloy with high strength and preparation method thereof Download PDFInfo
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- CN103849798B CN103849798B CN201210499139.6A CN201210499139A CN103849798B CN 103849798 B CN103849798 B CN 103849798B CN 201210499139 A CN201210499139 A CN 201210499139A CN 103849798 B CN103849798 B CN 103849798B
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000011777 magnesium Substances 0.000 claims abstract description 23
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 14
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910052718 tin Inorganic materials 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 38
- 239000000956 alloy Substances 0.000 claims description 38
- 238000005266 casting Methods 0.000 claims description 18
- 239000006104 solid solution Substances 0.000 claims description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 14
- 229910052749 magnesium Inorganic materials 0.000 claims description 14
- 238000013019 agitation Methods 0.000 claims description 12
- 238000011282 treatment Methods 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 6
- 238000007499 fusion processing Methods 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims 1
- 238000000265 homogenisation Methods 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000010309 melting process Methods 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 claims 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 210000002966 serum Anatomy 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to non-ferrous metal field, a kind of cast Mg alloy with high strength and preparation method thereof is related generally to, the chemical composition and mass percent of wherein magnesium alloy are：Al：4 ~ 8wt%, Zn:5 ~ 9wt%, Sn:0 ~ 2wt%, Sr：0 ~ 0.5wt%, Ca:0 ~ 2wt%, impurity element S i≤0.02, Fe≤0.003, Ni≤0.003, Cu≤0.003, surplus is Mg.With excellent impact resistance, it can be widely applied to prepare the impact-resistant part of the needs such as automotive front end.
Description
Technical field
The invention belongs to non-ferrous metal field, more particularly to a kind of novel high-strength impact resistance magnesium alloy and its preparation skill
Art.
Background technology
Magnesium and its alloy are the most light structural metallic materials applied in the industry so far, small, strong with lightweight, density
Degree is high, the good, die casting performance of rigidity is good, reduce the characteristics such as noise, electromagnetic wave shielding and the good, reusable edible of damping property.By material
Expert is described as the green engineering material of this century most development and application potentiality.From car resistance of motion equation, about
The 75% of oil consumption is relevant with vehicle complete vehicle quality, and rolling resistance is to oil consumption contribution about 35%, and acceleration resistance and grade resistance are to oil consumption
Contribution about 40%, contribution of the air drag to oil consumption is only 25%, air drag and automobile kerb weight and onrelevant.It can be seen that, drop
Low complete vehicle quality is the highly important measure for the oil consumption for reducing car.Because the proportion of magnesium only has 1.74kg/cm3, compare aluminium
（2.7kg/cm3）It is light by 1/3rd, therefore expand the important channel that application of the magnesium alloy on automobile is automotive light weight technology.It is worth
Pay attention to be, although China possesses " resource first, yield first, three " generation of export volume the first " in terms of magnesium industry at present
Boundary champion ", but constrained by existing Properties of Magnesium Alloy, consumption of the magnesium alloy on automobile（Average 3Kg）It is far from reaching
The level that people expect.Application of the magnesium alloy on automobile is mainly those, and obdurability is less demanding at room temperature and is easy to be cast into
The non-structural part of shape（Such as shell like members）, and these parts shared weight ratio in vehicle is extremely limited.Based on germany volkswagen
Company etc. predicts, can reach the target with 185 kilograms of magnesium alloy on every chassis from now on, and this requires that structural member (bag must be realized
Include the parts such as engine support, frame of handwheel, steering-column support, chair framework, wheel hub) magnesium alloy chemical, thus to magnesium close
The performance of gold it is also proposed requirements at the higher level.For these parts, in addition to formability to be met requirement, it is often more important that material will
With high-strength tenacity, energy damping simultaneously reaches that part will not be broken easily when being hit.But, existing magnesium alloy its obdurability is all
Can not fully meet its technical requirements, and existing AZ and AM series deformation magnesium alloys due to its strong anisotropy and tension and compression not
Symmetry, limits its application in terms of impact resistance part.This causes consumption and application level of the magnesium alloy on automobile all
Larger limitation is received, therefore new high-performance magnesium-alloy can be developed, will be that consumption and lifting are expanded to magnesium alloy
One stern challenge of technical merit.
This invention address that studying a kind of novel high-strength impact resistance cast magnesium alloy, excellent impact resistance is made it have
Can, it can be applied to prepare the impact-resistant part of the needs such as automotive front end.
The content of the invention
Goal of the invention：
The present invention is a kind of high-strength impact-resistant cast magnesium alloy and preparation method thereof, and its object is to by Serum Magnesium
The elements such as middle addition Al, Zn, Mn, Sn, Sr and Ca, improve its intensity and toughness, so as to improve the method for its impact resistance
Develop a kind of impact resistance cast magnesium alloy of high intensity.
Technical scheme：
The present invention is achieved through the following technical solutions：
A kind of cast Mg alloy with high strength, it is characterised in that：The chemical composition and mass percent of magnesium alloy be：Al：4~
8wt%, Zn:5 ~ 9wt%, Sn:0 ~ 2wt%, Sr：0 ~ 0.5wt%, Ca:0 ~ 2wt%, impurity element S i≤0.02, Fe≤0.003,
Ni≤0.003, Cu≤0.003, surplus is Mg.
Sn+Ca≤3wt% in the chemical composition of alloy.
A kind of preparation method of cast Mg alloy with high strength as described above, it is characterised in that：Dispensing according to the above ratio, it melts
Refining and casting process are as follows：
（1）Crucible is preheated to 300 DEG C, being passed through volume fraction is（0.6% SF6+99.4 N2）Hybrid protection gas,
The prior pure magnesium weighed well and by preheating is put into crucible, 690 DEG C is adjusted the temperature to, is warming up to after it is completely melt
720℃；
（2）Add the pure Al, pure Zn, pure Sn by 200 DEG C of preheatings；
（3）Add the Mg-30%Ca intermediate alloys and Al-90%Sr intermediate alloys by 200 DEG C of preheatings；
（4）After alloy all melts, mechanical agitation is carried out, alloy is fully melted and is homogenized；
（5）Using ultrasonic agitation 100s, crystal grain thinning；
（6）20min is incubated, power-off casting obtains the conjunction of high-strength casting magnesium into the stainless steel mould by 200 DEG C of preheatings
Gold；
Whole fusion process will strictly control furnace temperature and be carried out in protective gas, it is to avoid oxidation.
Alloy needs solid solution+Ageing Treatment after the casting.
The solid solubility temperature of alloy is 380 DEG C, and solution time is 8-12 hours.
Alloy needs timeliness after solid solution, and aging temp is 180 DEG C, and solution time is 10-15 hours.
Advantage and effect：
The present invention is a kind of cast Mg alloy with high strength and preparation method thereof, is had the following advantages that：
Magnesium alloy room temperature tensile intensity, yield strength and elongation are respectively 220 ~ 250MPa, 120 ~ 140 MPa, 6 ~ 9%.
The heat treatment of alloy of the present invention largely influences the mechanical property of alloy.The alloy of the present invention passes through solid solution
Mechanical property has obtained further raising after+Ageing Treatment.
The present invention heat treatment step be：By cast alloy in 380 DEG C of solid solutions 8-12 hours, then in 180 DEG C of timeliness 10-
15 hours.
The present invention alloy pass through solid solution+Ageing Treatment after mechanical property be：Tensile strength >=260MPa, surrender is strong
Degree >=140MPa, elongation percentage >=7%.
Embodiment：
With reference to specific embodiment, the present invention is described further, but protection scope of the present invention is not implemented
The limitation of example.
The present invention proposes a kind of cast Mg alloy with high strength, it is characterised in that：The chemical composition and quality hundred of magnesium alloy
Point ratio is：Al：4 ~ 8wt%, Zn:5 ~ 9wt%, Sn:0 ~ 2wt%, Sr：0 ~ 0.5wt%, Ca:0 ~ 2wt%, impurity element S i≤
0.02, Fe≤0.003, Ni≤0.003, Cu≤0.003, surplus are Mg.
Contain Sn or Ca elements in the chemical composition of alloy, or Sn and Ca have, and Sn+Ca≤3wt%.
A kind of preparation method of cast Mg alloy with high strength as described above, it is characterised in that：Dispensing according to the above ratio, it melts
Refining and casting process are as follows：
（1）Crucible is preheated to 300 DEG C, being passed through volume fraction is（0.6% SF6+99.4 N2）Hybrid protection gas,
The prior pure magnesium weighed well and by preheating is put into crucible, 690 DEG C is adjusted the temperature to, is warming up to after it is completely melt
720℃；
（2）Add the pure Al, pure Zn, pure Sn by 200 DEG C of preheatings；
（3）Add the Mg-30%Ca by 200 DEG C of preheatings（Percentage by weight）Intermediate alloy and Al-90%Sr（Weight percent
Than）Intermediate alloy；
（4）After alloy all melts, mechanical agitation is carried out, alloy is fully melted and is homogenized；
（5）Using ultrasonic agitation 100s, it is therefore an objective to crystal grain thinning；
（6）20min is incubated, power-off casting obtains the conjunction of high-strength casting magnesium into the stainless steel mould by 200 DEG C of preheatings
Gold；
Whole fusion process will strictly control furnace temperature and be carried out in protective gas, it is to avoid oxidation.
Alloy needs solid solution+Ageing Treatment after the casting, and the mechanical property after solid solution+Ageing Treatment is obtained
Further improve：Tensile strength >=260MPa, yield strength >=140MPa, elongation percentage >=7%.
The solid solubility temperature of alloy is 380 DEG C, and solution time is 8-12 hours.
Alloy needs timeliness after solid solution, and aging temp is 180 DEG C, and solution time is 10-15 hours.
Embodiment 1
Crucible is preheated to 300 DEG C, being passed through volume fraction is（0.6% SF6+99.4 N2）Hybrid protection gas, by thing
First weigh good and be put into crucible by the pure magnesium preheated, adjust the temperature to 690 DEG C, 720 are warming up to after it is completely melt
℃.Add the pure Al, pure Zn, pure Sn by 200 DEG C of preheatings.Add the Mg-30%Ca by 200 DEG C of preheatings（Percentage by weight）
Intermediate alloy and Al-90%Sr（Percentage by weight）Intermediate alloy.After alloy all melts, mechanical agitation is carried out, alloy is filled
Divide fusing and homogenize.Using ultrasonic agitation 100s, it is therefore an objective to crystal grain thinning.20min is incubated, power-off casting is to by 200 DEG C
In the stainless steel mould of preheating, cast Mg alloy with high strength is obtained.
Whole fusion process will strictly control furnace temperature and be carried out in protective gas, it is to avoid oxidation.
The casting composition of acquisition is as shown in the table（By mass percentage）：
| Al Zn Sn Ca Sr Mg |
| 5.5 5.2 1.2 1.7 0.3 surpluses |
As-cast specimen is come out 10 hours for 10 hours in 180 DEG C of timeliness afterwards in 380 DEG C of solution treatment.As cast condition and process
The mechanical property of sample is as shown in the table after solid solution and [0028] timeliness：
| Condition of heat treatment tensile strength（Mpa）Yield strength（Mpa）Elongation percentage (%) |
| As cast condition 221 120 6.5 |
| Solid solution+timeliness 265 150 7 |
Embodiment 2
Crucible is preheated to 300 DEG C, being passed through volume fraction is（0.6% SF6+99.4 N2）Hybrid protection gas, by thing
First weigh good and be put into crucible by the pure magnesium preheated, adjust the temperature to 690 DEG C, 720 are warming up to after it is completely melt
℃.Add the pure Al, pure Zn, pure Sn by 200 DEG C of preheatings.Add the Mg-30%Ca by 200 DEG C of preheatings（Percentage by weight）
Intermediate alloy and Al-90%Sr（Percentage by weight）Intermediate alloy.After alloy all melts, mechanical agitation is carried out, alloy is filled
Divide fusing and homogenize.Using ultrasonic agitation 100s, it is therefore an objective to crystal grain thinning.20min is incubated, power-off casting is to by 200 DEG C
In the stainless steel mould of preheating, cast Mg alloy with high strength is obtained.
Whole fusion process will strictly control furnace temperature and be carried out in protective gas, it is to avoid oxidation.
The casting composition of acquisition is as shown in the table（By mass percentage）：
| Al Zn Sn Ca Sr Mg |
| 7.2 5.6 1.7 1.3 0.4 surpluses |
As-cast specimen is come out 12 hours for 8 hours in 180 DEG C of timeliness afterwards in 380 DEG C of solution treatment.As-cast specimen and
As cast condition mechanical property after [0031] solid solution and timeliness is as shown in the table：
| Condition of heat treatment tensile strength（Mpa）Yield strength（Mpa）Elongation percentage (%) |
| As cast condition 231 125 8.1 |
| Solid solution+timeliness 275 152 7.3 |
Embodiment 3
Crucible is preheated to 300 DEG C, being passed through volume fraction is（0.6% SF6+99.4 N2）Hybrid protection gas, by thing
First weigh good and be put into crucible by the pure magnesium preheated, adjust the temperature to 690 DEG C, 720 are warming up to after it is completely melt
℃.Add the pure Al, pure Zn, pure Sn by 200 DEG C of preheatings.Add the Mg-30%Ca by 200 DEG C of preheatings（Percentage by weight）
Intermediate alloy and Al-90%Sr（Percentage by weight）Intermediate alloy.After alloy all melts, mechanical agitation is carried out, alloy is filled
Divide fusing and homogenize.Using ultrasonic agitation 100s, it is therefore an objective to crystal grain thinning.20min is incubated, power-off casting is to by 200 DEG C
In the stainless steel mould of preheating, cast Mg alloy with high strength is obtained.
Whole fusion process will strictly control furnace temperature and be carried out in protective gas, it is to avoid oxidation.
The casting composition of acquisition is as shown in the table（By mass percentage）：
| Al Zn Sn Ca Sr Mg |
| 6.3 6.4 2.0 0.8 0.5 surpluses |
By as-cast specimen after 380 DEG C of solution treatment 12 hours in 180 DEG C of Ageing Treatments 15 hours.As-cast specimen and
Mechanical property is as shown in the table after as cast condition crosses solid solution and timeliness through [0034]：
| Condition of heat treatment tensile strength（Mpa）Yield strength（Mpa）Elongation percentage (%) |
| As cast condition 245 130 7.0 |
| Solid solution+timeliness 271 148 7.2 |
Embodiment 4
Add pure Al, the pure Zn by 200 DEG C of preheatings, other condition be the same as Examples 3.
The casting composition of acquisition is as shown in the table（By mass percentage）：
| Al Zn Sn Ca Sr Mg |
| 4.0 5.0 0 2.0 0.1 surpluses |
Embodiment 5
Add pure Al, pure Zn, the pure Sn by 200 DEG C of preheatings, other condition be the same as Examples 2.
The casting composition of acquisition is as shown in the table（By mass percentage）：
| Al Zn Sn Ca Sr Mg |
| 8.0 9.0 1.0 1.0 0.2 surpluses |
Conclusion：
The present invention proposes a kind of novel high-strength cast magnesium alloy and preparation method thereof, by being added in Serum Magnesium
The elements such as Al, Zn, Mn, Sn, Sr and Ca, improve its intensity and toughness, so as to improve its impact resistance, can be applied to prepare
Automotive front end etc. needs impact-resistant part.
Claims (1)
1. a kind of cast Mg alloy with high strength, it is characterised in that：The chemical composition and mass percent of magnesium alloy be：Al：
6.3wt%, Zn:6.4wt%, Sn:2.0wt%, Sr：0.5wt%, Ca:0.8wt%, impurity element S i≤0.02wt%, Fe≤
0.003wt%, Ni≤0.003wt%, Cu≤0.003wt%, surplus are Mg；
Dispensing according to the above ratio, its melting and casting process are as follows：
Crucible is preheated to 300 DEG C, the SF that volume fraction is 0.6% is passed through6+ 99.4% N2, hybrid protection gas will claim in advance
Amount is good and the pure magnesium by preheating is put into crucible, adjusts the temperature to 690 DEG C, 720 DEG C are warming up to after it is completely melt；Plus
Enter the pure Al, pure Zn, pure Sn by 200 DEG C of preheatings；Add in the middle of the Mg-30%Ca by weight percentage by 200 DEG C of preheatings
Alloy and by weight percentage Al-90%Sr intermediate alloys；After alloy all melts, mechanical agitation is carried out, makes alloy abundant
Fusing and homogenization；Using ultrasonic agitation 100s, it is therefore an objective to crystal grain thinning；20min is incubated, power-off casting is pre- to passing through 200 DEG C
In the stainless steel mould of heat, cast Mg alloy with high strength is obtained；
Whole fusion process will strictly control furnace temperature and be carried out in protective gas, it is to avoid oxidation；
By as-cast specimen after 380 DEG C of solution treatment 12 hours in 180 DEG C of Ageing Treatments 15 hours；As-cast specimen and as cast condition
Tensile strength is 245 MPa under as cast condition in mechanical property after solid solution and timeliness, and yield strength is 130 MPa, extension
Rate 7.0%；Under solid solution+aged, tensile strength is 271 MPa, and yield strength is 148MPa, elongation percentage 7.2%.
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Applications Claiming Priority (1)
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| CN201210499139.6A CN103849798B (en) | 2012-11-30 | 2012-11-30 | A kind of cast Mg alloy with high strength and preparation method thereof |
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| CN103849798A CN103849798A (en) | 2014-06-11 |
| CN103849798B true CN103849798B (en) | 2017-11-07 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104190898A (en) * | 2014-09-22 | 2014-12-10 | 中北大学 | Extrusion casting method of particle reinforced magnesium matrix composites |
| CN104480361B (en) * | 2014-11-26 | 2017-01-11 | 沈阳工业大学 | High-strength/toughness heat-resistant die casting magnesium alloy and preparation method thereof |
| CN104561494A (en) * | 2014-12-22 | 2015-04-29 | 芜湖福司精密模具有限公司 | Heat treatment method for automotive instrument panel beam |
| CN105112751B (en) * | 2015-10-18 | 2017-09-12 | 河北工业大学 | A kind of high-strength cast magnesium alloy and preparation method thereof |
| CN105385920B (en) * | 2015-12-17 | 2017-08-25 | 山东省科学院新材料研究所 | A kind of heat treatment reinforcement cast Mg alloy with high strength and preparation method thereof |
| CN108103335A (en) * | 2017-09-12 | 2018-06-01 | 广东省材料与加工研究所 | A kind of method for refining Mg-Zn systems alloy grain |
| CN110453124B (en) * | 2018-05-08 | 2021-02-05 | 有研工程技术研究院有限公司 | Tin-magnesium alloy and preparation and processing method thereof |
| CN109439987A (en) * | 2018-12-29 | 2019-03-08 | 厦门十维科技有限公司 | Superelevation thermal conductivity aligns graphene magnesium base alloy, preparation method and device |
| CN111172440B (en) * | 2020-01-15 | 2021-12-10 | 太原科技大学 | Low-cost rapid-corrosion magnesium alloy and preparation method thereof |
| CN115537620B (en) * | 2021-06-30 | 2024-02-27 | 比亚迪股份有限公司 | Die-casting magnesium alloy and preparation method and application thereof |
| CN114058890B (en) * | 2021-11-24 | 2022-04-19 | 西北工业大学 | Method for preparing Mg-Al-Zn-Mn-Cu multi-element alloy by three-dimensional ultrasonic combined sound field detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5855697A (en) * | 1997-05-21 | 1999-01-05 | Imra America, Inc. | Magnesium alloy having superior elevated-temperature properties and die castability |
| ATE505567T1 (en) * | 2000-09-26 | 2011-04-15 | Shin Kwang Seon | HIGH STRENGTH MAGNESIUM ALLOY |
| CN100406159C (en) * | 2006-01-20 | 2008-07-30 | 中国科学院金属研究所 | Method for casting Mg-Al-Zn based magnesium alloy with high strength and high tenacity |
| CN101724772B (en) * | 2009-12-16 | 2012-08-01 | 沈阳工业大学 | High-strength cast magnesium alloy and preparation method thereof |
| JP2012092474A (en) * | 2010-09-30 | 2012-05-17 | Midori Anzen Co Ltd | Trousers, overalls and pad |
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