CN111519071A - Novel high-strength and high-toughness die-casting aluminum alloy with remarkable ultrashort aging characteristic and preparation method thereof - Google Patents
Novel high-strength and high-toughness die-casting aluminum alloy with remarkable ultrashort aging characteristic and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a novel high-strength and high-toughness die-casting aluminum alloy material with remarkable ultrashort-time aging characteristic and a preparation method thereof. The novel high-strength and high-toughness die-casting aluminum alloy comprises the following components in percentage by weight: si: 2.0-4.0; mg: 3.0-6.0; zn: 1.0-4.0; mn: 0.4-1.0; fe: 0.1-0.4; zr: 0.1-0.3; sr: 0.005-0.1, and the balance of Al and less than 0.1% of other elements. And (3) carrying out die-casting molding on the prepared aluminum melt, and carrying out air cooling for 10-50 s after demolding. Mg, Si, Zn, Zr and other elements are dissolved in the Al matrix in a large amount through rapid cooling, so that the alloy strength is improved, and the elongation of the material is ensured. And (3) performing high-temperature ultra-short time aging after die casting, wherein the tensile strength of the obtained material is 380-410 MPa, the yield strength is 300-310 MPa, and the elongation is 5.0-6.2%. The aluminum alloy has the advantages of excellent casting performance, high strength, good dimensional stability, no addition of rare earth elements, good economy, excellent mechanical properties and remarkable ultrashort aging strengthening property, and is particularly suitable for manufacturing communication and electronic product structural members by adopting a die-casting process.
Description
Technical Field
The invention relates to the field of aluminum alloy materials and preparation and forming thereof, in particular to a novel high-strength high-toughness die-casting aluminum alloy with remarkable ultrashort aging characteristic and suitable for complex thin-wall die castings, and a preparation method and application thereof.
Background
The aluminum alloy has the advantages of small density, high strength, easy processing, good corrosion resistance, electric and heat conduction, casting processability and high specific strength, so the aluminum alloy has wide application in the fields of communication electronics, transportation and the like. At present, aluminum alloy die castings are developing towards large-scale, thin-wall, complex, high-precision and high-strength and toughness directions. With the rapid development of society, the arrival of the 5G era in the communication industry and the continuous improvement of people's requirements, the 3C product is increasingly updated and replaced, and the requirements on the multi-functionalization, individuation and light weight of electronic products are increasingly strengthened. Aluminum alloy thin-wall die castings also take a great importance in the production of shells of communication electronic equipment, such as filter cavities for base stations, emitter shells, shells of notebooks and mobile phones, middle plates of mobile phones and the like. Particularly, mobile phones are developing in the directions of high strength, high toughness, high heat dissipation and high thinness, and the aluminum alloy die casting technology is promoted to advance in the direction of high precision.
At present, communication electronic parts, especially mobile phone middle plates, put higher requirements on the mechanical properties of materials, and cast aluminum alloy materials are required to have good fluidity and good mechanical properties of high strength and high toughness. At present, the general industrial die-casting aluminum alloy mainly comprises Al-Si-Mg alloy (such as YL104, A356, A360 and the like), the mechanical property of the Al-Si-Mg alloy can be improved only by solid solution strengthening and aging treatment, but the casting is inevitably deformed in the heat treatment process, and a correction procedure is required to be added, so that the preparation cost is improved; the Cu content of the other traditional die-casting Al-Si-Cu alloy (such as ADC12 and the like) is higher, generally 2% -5% of Cu is added into the alloy, the Cu can improve the strength of a die-casting piece but reduces the toughness of the casting piece, and the corrosion resistance of the casting piece is reduced by adding excessive Cu; and the other die-casting aluminum alloy material with better toughness is Al-Mg series, such as domestic YL302, Japanese ADC5, ADC6, American 518 and other brands of die-casting aluminum alloys, and the alloys have good corrosion resistance, higher strength and toughness, but poor fluidity, so that the casting performance is poor, and the die-casting piece is easy to crack, stress corrosion crack and other defects. Therefore, how to improve the strength of the alloy and give consideration to good forming performance, and the aluminum alloy material for communication electronics is a technical problem which needs to be solved urgently without solid solution and normal aging treatment.
Disclosure of Invention
Aiming at the technical current situation, the invention aims to provide a novel high-strength high-toughness die-casting aluminum alloy with remarkable ultrashort aging characteristic and a preparation method thereof, which is suitable for complex thin-wall die castings, and the high-strength high-toughness aluminum alloy material can be obtained without long-time heat treatment, and the alloy has good fluidity and can be used for forming various complex thin-wall parts.
In order to achieve the technical purpose, the invention firstly optimizes the alloy components and the proportion: the components of the alloy are optimized through thermodynamic analysis and calculation, and a proper amount of Zn is added on the basis of the Al-Si-Mg alloy, so that the fluidity of the alloy is improved, the formability of the alloy is improved, and the cracking in the die-casting process is greatly reduced. Meanwhile, a proper amount of Zn is added to improve the strength of the alloy material in an as-cast state. In order to further improve the as-cast mechanical property of the alloy material, the yield strength of the alloy is further improved by adding a small amount of transition element Zr. The proportion of each element and the content of impurities are strictly controlled, the positive action of each element in the alloy is fully exerted, and the negative action is reduced, and the method specifically comprises the following steps: controlling the mass percentage content of Si element within 2-4%, reducing the amount of eutectic silicon and improving the elongation of the alloy; the mass percentage content of Mg element is controlled to be 3.0-6.0%, and the solid solution strengthening effect of the Mg element on the Al alloy matrix is fully exerted by combining the subsequent near-rapid solidification die-casting forming technology, so that the alloy strength is improved; the mass percentage content of Zn element is controlled within the range of 2.0-4.0 percent, so as to improve the cast strength of the alloy and the fluidity of the material; the mass percentage content of the Fe element is controlled to be 0.2-0.4%, the formation quantity of the Fe-rich phase is controlled, and the demoulding capability of the alloy during die casting is considered; the modification of Sr element is utilized to refine eutectic silicon phase and ensure the toughness of the alloy.
In order to achieve the technical purpose, the invention optimizes the preparation of the alloy: the adding conditions of each component are controlled, so that the positive effects of each component are fully exerted.
In order to achieve the technical purpose, the invention also optimizes the die-casting forming process: smelting the alloy, degassing, removing impurities, standing to a pouring temperature, and controlling the temperature of a die to be 200-300 ℃ during die casting; after the die casting is taken out, the temperature of the casting is cooled to 30-50 ℃ by air cooling and forcing, the cooling time is controlled within 10-50 s, and the aluminum alloy casting with the wall thickness of 0.3-2 mm is prepared by die casting. The rapid cooling by air cooling is one of the keys in the preparation of the alloy of the invention, so that a supersaturated melt with high solid solubility is formed in an aluminum matrix.
In a word, the invention fully utilizes the solid solution strengthening effect of alloy strengthening elements such as Mg, Zn and the like through the optimization of alloy components and the control of casting forming and cooling, improves the strength of the alloy on the premise of ensuring the elongation of the alloy, prepares high-strength and high-toughness thin-wall die castings and meets the application requirements of the communication electronic industry.
Namely, the technical scheme of the invention is as follows: a novel high-strength high-toughness die-casting aluminum alloy material with remarkable ultrashort aging characteristic for thin-wall die castings and a preparation method thereof are disclosed: the high-strength and high-toughness heat-dissipation aluminum alloy material for the thin-wall die casting comprises the following elements: si content: 2.0 wt% -4.0 wt%; mg content: 3.0 wt% -6.0 wt%; the Zn content is as follows: 1.0wt% -4.0 wt%; mn content: 0.4wt% -1.0 wt%; fe content: 0.1wt% 0.4 wt%; zr content: 0.1-0.3 wt%, Sr content: 0.005-0.1 wt% of other impurity elements, less than 0.1wt%, and the balance of Al.
Further, the aluminum alloy material is composed of elements; 2.5-3.5 wt% of Si, 4.0-5.0 wt% of Mg, 3.0-4.0 wt% of Zn, and Mn: 0.5wt% -0.8 wt%; (ii) a Fe: 0.15 wt% 0.25wt%; zr content: 0.2 to 0.25 weight percent of the total weight of the alloy, 0.005 to 0.05 weight percent of Sr, less than 0.1 weight percent of other impurity elements and the balance of Al.
Further, the aluminum alloy material is composed of elements; si content of 3.0 wt% -4.0wt%, Mg content of 4.5 wt% -6.0 wt%, Zn content of 2.0 wt% -3.0 wt%, Mn content: 0.6wt% -0.7 wt%; zr content: 0.1-0.2 wt% of Sr, 0.005-0.1 wt% of Fe, 0.2-0.4 wt% of Fe, less than 0.1wt% of other impurity elements and the balance of Al.
The preparation method of the high-strength and high-toughness aluminum alloy material for the thin-wall die casting comprises the following steps:
the core is that the aluminum alloy melt is rapidly cooled, so that a supersaturated melt with high solid solubility is formed in an aluminum matrix, and the method specifically comprises the following steps:
(1) putting the industrial pure Al into a heating furnace under the protection of inert atmosphere, heating until the industrial pure Al is completely melted, and then preserving heat for 15-50 min; then heating to 750-780 ℃, adding metal Si and A1-Fe intermediate alloy, and stirring;
(2) setting the furnace temperature to 740-750 ℃, keeping the temperature for 15-50 min after the melt temperature is stabilized to 740-750 ℃, and adding Al-Zn intermediate alloy, pure Mg ingot and Al-Sr intermediate alloy; weighing a sodium-free powdery refining agent according to the proportion of 1-2 per mill of the total amount of furnace burden, and carrying out blowing refining;
(3) after the blowing refining is finished, controlling the temperature of an aluminum alloy melt in the furnace at 710-720 ℃, sampling in a liquid state, cooling to room temperature, performing direct-reading spectral analysis, calculating the mass of a raw material to be added by taking the composition of alloy elements as a target, adding the raw material according to the calculation result, wherein the added material is at least one of industrial pure aluminum, metal Si, Al-Fe intermediate alloy, Al-Zn intermediate alloy and pure Mg ingot, and then standing for more than 50 min; adding Al-Sr alloy, and standing for more than 30 min;
(4) conveying molten metal to an injection chamber for thin-wall part die casting, wherein the temperature of the molten metal in a furnace is 650-720 ℃ during die casting; after the die casting is finished, air cooling is carried out, the temperature of the casting is rapidly reduced, and a supersaturated solid solution with high solid solubility is formed;
(5) and after the die casting is taken out, air blowing cooling is carried out, and the temperature of the casting is reduced.
The high-strength and high-toughness aluminum alloy material prepared by the elements and the method can be die-cast into a thin-wall part wall, and the wall thickness is 0.3-2 mm.
Then, the ultra-short artificial aging is carried out on the casting after the die-casting molding, and the aging temperature is 250 ℃ to 300 ℃ for 15 to 30 seconds.
The tensile strength of the thin-wall part is 390-410 MPa, the yield strength is 300-310 MPa, and the elongation is 5.1-6.2%.
The invention has the following beneficial effects:
1) according to the high-strength and high-toughness aluminum alloy die-casting forming method, the temperature of the die-casting die is controlled, an air cooling means is adopted after the casting is taken, and a process condition of rapid solidification is formed in the forming process of a complex thin-wall die-casting, so that a casting forms a supersaturated solid solution, the strength and toughness of the casting are improved without long-time heat treatment, and the material processing cost is not increased;
2) according to the invention, the mass percentage content of the Si element is controlled within the range of 2-4%, the eutectic silicon amount is reduced, and the alloy elongation is improved; the mass percentage content of the Mg element is controlled to be 4.0-6.0%, and the solid solution strengthening effect of the Mg element on the Al alloy matrix is exerted by combining the subsequent near-rapid solidification die-casting forming technology, so that the alloy strength is improved; the mass percentage content of Zn element is controlled within the range of 2.0-4.0 percent, so as to improve the cast strength of the alloy and the fluidity of the material, and fully play the role of the cooperative reinforcement of Mg and Zn; the mass percentage content of Fe element is controlled to be 0.2-0.4%, the forming quantity of Fe-rich phase is controlled, the demoulding capability of the alloy during die casting is considered, and the content of oxide inclusion formed in the smelting and die casting processes is controlled to be lower; the modification of Sr element is utilized to refine eutectic silicon phase and ensure the toughness of the alloy.
Detailed Description
The invention discloses a high-strength and high-toughness aluminum alloy, in particular to a high-strength and high-toughness aluminum alloy for thin-wall die castings, which is obtained by controlling the element composition in the aluminum alloy and the preparation method of an aluminum melt.
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited to these examples.
The embodiment of the invention provides a high-strength and high-toughness aluminum alloy material for a thin-wall die casting with remarkable ultrashort aging characteristic, which comprises the following chemical components in percentage by mass: si: 2.0 wt% -4.0 wt%; mg: 3.0 wt% -6.0 wt%; zn: 1.0wt% -4.0 wt%; mn: 0.4wt% -1.0 wt%; fe: 0.1wt% 0.4 wt%; zr: 0.1-0.3 wt%, Sr: 0.005-0.1 wt% of other impurity elements, less than 0.1wt%, and the balance of Al.
In the embodiment, Si added into the aluminum alloy is one of main elements for improving the fluidity of the aluminum liquid, although the addition amount is only 2% -4%, the Si is matched with Zn to ensure that the alloy has good filling formability, and a thin-wall complex structural part can be produced. The Mg and the Zn are added in the alloy, so that strengthening phases such as MgZn2 and Mg2Si can be formed, the alloy is guaranteed to have higher strength, meanwhile, the natural aging strengthening effect of MgZn2 is good, and high strength is obtained without high-temperature solid solution heat treatment and long-time artificial aging treatment. The addition of Fe avoids die sticking, and although Fe and Si can form a needle-shaped or flake-shaped beta-AlFeSi phase to reduce the elongation of the alloy, the cooling rate of the die casting process for sub-rapid solidification, particularly thin-walled parts, is as high as more than 300 ℃/s, so that the precipitated beta-AlFeSi phase is very fine, and the influence on the elongation is extremely small. In addition, Zr element in the chemical composition can form crystal grains of the effective refined alloy and is matched with the modification treatment of Sr, so that the crystal grain size can be reduced, the eutectic silicon phase can be refined, and the toughness is further improved. And air cooling is arranged after the die casting is finished, so that the temperature of the casting is rapidly reduced, and a supersaturated solid solution with high solid solubility is formed.
Example 1:
firstly, preparing a melt of 5 alloy groups, wherein alloy 1, alloy 2 and alloy 3 are the novel high-strength die-casting aluminum alloy of the invention, and alloy 4 and ADC12 are used as comparison:
alloy 1: si: 2.5 percent; mg: 5.0 percent; zn: 2.5 percent; mn: 0.7 percent; fe: 0.22 percent; zr: 0.16%, Sr: 0.006%, Ti0.05% and the balance Al and small amounts of unavoidable impurities.
Alloy 2: si: 3.0 percent; mg: 4.5 percent; zn: 3.5 percent; mn: 0.5 percent; fe: 0.22 percent; zr: 0.18 percent, Sr: 0.006%, Ti0.05% and the balance Al and small amounts of unavoidable impurities.
Alloy 3: si: 4.0 percent; mg: 6.0 percent; zn: 4.0 wt; mn: 0.9 percent; fe: 0.27 percent; zr: 0.2 percent, Sr: 0.006%, Ti0.06%, and the balance Al and small amounts of unavoidable impurities.
Alloy 4: si: 7.5 percent; mg: 2.0 percent; zn: 0.8 percent; cu: 0.9 percent; mn: 0.6 percent; fe: 0.11 percent; sr: 0.006%, Ti0.05% and the balance Al and small amounts of unavoidable impurities.
ADC 12: 11% of Si, 0.88% of Zn0.88% of Mg0.25%, 0.8% of Fe0.7% of Cu1.7%, 0.2% of Mn0.05%, 0.04% of Ni0%, and the balance of Al and a small amount of inevitable impurities.
A batch of standard samples was prepared as follows:
smelting: putting pure aluminum into a smelting furnace, heating to 760 ℃ for melting, adding the proportioned materials of silicon, iron, magnesium, Zn and the like, and uniformly stirring; and (3) introducing inert gas by using a blowing device at the temperature of 700 plus 760 ℃, uniformly spraying the aluminum alloy refining agent into the melt, degassing and deslagging for 30-40 minutes, removing scum, standing for 20-40 minutes, and controlling the temperature of the melt to 710 ℃ to obtain the aluminum alloy melt.
Casting: preparing an aluminum alloy melt according to the steps, and preparing a batch of standard die-casting samples by using a 280-ton die-casting machine, wherein the casting temperature is 700 ℃. (ii) a And air cooling is arranged after the die casting is finished, so that the temperature of the casting is rapidly reduced, and a supersaturated solid solution with high solid solubility is formed.
And (3) carrying out ultra-short time artificial aging on the 5 combined gold, wherein the aging process is 280-15 seconds, and testing the as-cast state and the mechanical property after the ultra-short time aging. The composition and average mechanical property data of each alloy are shown in table 1.
TABLE 1 comparison of mechanical properties of different alloys in as-cast condition and ultra-short aging
As can be seen from the results in Table 1, the strength and elongation of the aluminum alloy of the present invention are much higher than those of conventional materials, and the aluminum alloy can meet the requirements of communication and electronic products on thin-wall complex structures. The yield strength of the alloy can be greatly improved and good elongation can be kept only by carrying out high-temperature short-time artificial aging on the material. Therefore, the aluminum alloy material has excellent mechanical property and ultra-short natural aging strengthening property.
Example 2:
according to the smelting steps, a batch of high-strength and high-toughness die-casting aluminum alloy is prepared, and the high-strength and high-toughness die-casting aluminum alloy is analyzed by a direct-reading spectrometer to obtain the high-strength and high-toughness die-casting aluminum alloy with the following components in percentage by mass: si: 2.6 percent; mg: 5.2 percent; zn: 2.7 percent; mn: 0.71 percent; fe: 0.22 percent; zr: 0.16%, Sr: 0.006 percent and Ti0.05 percent. The alloy melt was poured into a spiral fluidity-testing mold preheated to 180 ℃ while it was superheated at 100 ℃. Spiral samples of the ADC12 alloy were prepared for comparison in the same manner.
For each alloy, 5 spiral samples were cast and the measured lengths averaged. The fluidity of the alloy is characterized in terms of percentage of the flow length of the ADC12 alloy. The length of the ADC12 alloy helix specimen is 1172 mm, and the length of the helix pattern of the alloy of this example is 1075 mm. The fluidity of the alloy of this example was 91.7% of that of the ADC12 alloy. Therefore, the alloy of the invention has good casting fluidity, namely, the alloy has good die-casting forming performance.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention, and all of the technical solutions are covered in the protective scope of the present invention.
Claims (9)
1. The high-strength and high-toughness aluminum alloy material for the thin-wall die casting is characterized in that the aluminum alloy material is composed of the following elements: si: 2.0 wt% -4.0 wt%; mg: 3.0 wt% -6.0 wt%; zn: 1.0wt% -4.0 wt%; mn: 0.4wt% -1.0 wt%; fe: 0.1wt% 0.4 wt%; zr: 0.1-0.3 wt%, Sr: 0.005-0.1 wt% of other impurity elements, less than 0.1wt%, and the balance of Al.
2. The high-strength aluminum alloy material for thin-walled die castings according to claim 1, wherein: the aluminum alloy material comprises the following elements: 2.5-3.5 wt% of Si, 4.0-5.0 wt% of Mg, 3.0-4.0 wt% of Zn, and Mn: 0.5wt% -0.8 wt%; fe: 0.15 wt% 0.25wt%; zr: 0.2 to 0.25 weight percent of the total weight of the alloy, 0.005 to 0.05 weight percent of Sr, less than 0.1 weight percent of other impurity elements and the balance of Al.
3. The high-strength aluminum alloy material for thin-walled die castings according to claim 1, wherein: the aluminum alloy material comprises the following elements: 3.0 wt% -4.0wt% of Si, 4.5 wt% -6.0 wt% of Mg, 2.0 wt% -3.0 wt% of Zn, Mn: 0.6wt% -0.7 wt%; fe: 0.25wt% 0.4 wt%; zr: 0.1-0.2 wt% of Sr, 0.005-0.1 wt% of Sr, less than 0.1wt% of other impurity elements and the balance of Al.
4. A method for preparing the high-strength and high-toughness aluminum alloy material for the thin-wall die casting as claimed in claim 1, wherein the method comprises the following steps: the method specifically comprises the following steps: (1) under the protection of inert atmosphere, putting pure Al into a heating furnace, heating until the pure Al is completely melted, and then preserving heat for 15-50 min; then heating to 750-780 ℃, adding metal Si and A1-Fe intermediate alloy, and stirring; (2) setting the furnace temperature to 740-750 ℃, keeping the temperature for 15-50 min after the melt temperature is stabilized to 740-750 ℃, and adding Al-Zn intermediate alloy, pure Mg ingot and Al-Sr intermediate alloy; weighing a sodium-free powdery refining agent according to the proportion of 1-2 per mill of the total amount of furnace burden, and carrying out blowing refining; (3) after the blowing refining is finished, controlling the temperature of the aluminum alloy melt in the furnace at 710-720 ℃, sampling in a liquid state, cooling to room temperature, performing direct-reading spectral analysis, calculating the mass of a raw material to be added by taking the composition of alloy elements as a target, adding the raw material according to a calculation result, wherein the added material is at least one of industrial pure aluminum, metal Si, Al-Fe intermediate alloy, Al-Zn intermediate alloy and pure Mg ingot, and then standing for more than 50 min; adding Al-Sr alloy, and standing for more than 30 min; (4) conveying the molten metal to an injection chamber for thin-walled part die casting, wherein the temperature of the molten metal in a furnace is 650-720 ℃ during die casting; after the die casting is finished, air cooling is carried out, the temperature of the casting is rapidly reduced, and a supersaturated solid solution with high solid solubility is formed; and (5) after the die casting is taken out, air blowing cooling is carried out, and the temperature of the casting is reduced.
5. The preparation method of the high-strength and high-toughness aluminum alloy material for the thin-wall die casting as claimed in claim 4, wherein the method comprises the following steps: in the step 4, the temperature of the die-casting die is 200-300 ℃.
6. The preparation method of the high-strength and high-toughness aluminum alloy material for the thin-wall die castings according to claims 4 to 5, characterized by comprising the following steps: and 4, cooling the die casting by blowing for 10-50 s to reduce the surface temperature of the casting to 30-50 ℃.
7. A thin-walled die casting characterized by: the method is characterized in that the ultra-short time artificial aging is carried out on the casting, and the aging temperature is 250 ℃ to 300 ℃ to 15 to 30 seconds.
8. The thin-walled die casting of claim 7, wherein: the wall thickness of the thin-wall die casting is 0.3-2 mm.
9. The thin-walled die casting of claim 7 or 8, wherein: the tensile strength of the thin-wall die casting is 390MPa, the yield strength is 305MPa, and the elongation is 5 percent.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112609112A (en) * | 2020-11-16 | 2021-04-06 | 中山市银骏五金制品有限公司 | High-rust-resistance aluminum alloy and preparation method thereof |
| CN114150237A (en) * | 2021-11-26 | 2022-03-08 | 苏州慧驰轻合金精密成型科技有限公司 | High-toughness structural part precision forming aluminum alloy material suitable for new energy automobile and preparation method thereof |
| CN114592148A (en) * | 2022-03-11 | 2022-06-07 | 中南大学 | High-strength and high-toughness Al-Mg for additive manufacturing2Si-Zn alloy and preparation method and application thereof |
| CN114752822A (en) * | 2022-05-25 | 2022-07-15 | 深圳南科强正轻合金技术有限公司 | Die-casting aluminum alloy and preparation method thereof |
| CN114959368A (en) * | 2022-04-19 | 2022-08-30 | 山东意吉希精密制造有限公司 | Al-Fe type motor rotor alloy and preparation method and application thereof |
| CN115449676A (en) * | 2022-10-28 | 2022-12-09 | 江苏亚太轻合金科技股份有限公司 | Die-casting Al-Zn-Mg-Mn aluminum alloy and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104862552A (en) * | 2015-05-28 | 2015-08-26 | 马鸿斌 | Novel aluminum alloy and preparation method thereof |
| CN109072356A (en) * | 2016-04-19 | 2018-12-21 | 莱茵费尔登合金有限责任两合公司 | Diecasting alloys |
| CN109852853A (en) * | 2019-04-01 | 2019-06-07 | 苏州大学 | Tough radiation aluminium alloy material of a kind of thin-wall die casting height and preparation method thereof |
-
2020
- 2020-05-12 CN CN202010395329.8A patent/CN111519071A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104862552A (en) * | 2015-05-28 | 2015-08-26 | 马鸿斌 | Novel aluminum alloy and preparation method thereof |
| CN109072356A (en) * | 2016-04-19 | 2018-12-21 | 莱茵费尔登合金有限责任两合公司 | Diecasting alloys |
| CN109852853A (en) * | 2019-04-01 | 2019-06-07 | 苏州大学 | Tough radiation aluminium alloy material of a kind of thin-wall die casting height and preparation method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112609112A (en) * | 2020-11-16 | 2021-04-06 | 中山市银骏五金制品有限公司 | High-rust-resistance aluminum alloy and preparation method thereof |
| CN114150237A (en) * | 2021-11-26 | 2022-03-08 | 苏州慧驰轻合金精密成型科技有限公司 | High-toughness structural part precision forming aluminum alloy material suitable for new energy automobile and preparation method thereof |
| CN114592148A (en) * | 2022-03-11 | 2022-06-07 | 中南大学 | High-strength and high-toughness Al-Mg for additive manufacturing2Si-Zn alloy and preparation method and application thereof |
| CN114959368A (en) * | 2022-04-19 | 2022-08-30 | 山东意吉希精密制造有限公司 | Al-Fe type motor rotor alloy and preparation method and application thereof |
| CN114959368B (en) * | 2022-04-19 | 2023-04-07 | 山东意吉希精密制造有限公司 | Al-Fe type motor rotor alloy and preparation method and application thereof |
| CN114752822A (en) * | 2022-05-25 | 2022-07-15 | 深圳南科强正轻合金技术有限公司 | Die-casting aluminum alloy and preparation method thereof |
| CN114752822B (en) * | 2022-05-25 | 2023-02-24 | 深圳南科强正轻合金技术有限公司 | Die-casting aluminum alloy and preparation method thereof |
| CN115449676A (en) * | 2022-10-28 | 2022-12-09 | 江苏亚太轻合金科技股份有限公司 | Die-casting Al-Zn-Mg-Mn aluminum alloy and preparation method thereof |
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