EP3954798B1 - Aluminium-druckgusslegierung, verfahren zu ihrer herstellung und strukturelement für ein kommunikationsprodukt - Google Patents

Aluminium-druckgusslegierung, verfahren zu ihrer herstellung und strukturelement für ein kommunikationsprodukt Download PDF

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EP3954798B1
EP3954798B1 EP20802262.4A EP20802262A EP3954798B1 EP 3954798 B1 EP3954798 B1 EP 3954798B1 EP 20802262 A EP20802262 A EP 20802262A EP 3954798 B1 EP3954798 B1 EP 3954798B1
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Prior art keywords
die
aluminum alloy
cast aluminum
cast
mass percentage
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English (en)
French (fr)
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EP3954798A4 (de
EP3954798A1 (de
Inventor
Tao Yang
Guoliang HUO
Shaohui Zhang
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Honor Device Co Ltd
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Honor Device Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04—Casting aluminium or magnesium
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent

Definitions

  • the present invention relates to the technical field of aluminum alloy materials, and in particular, to a die-cast aluminum alloy, a method for preparing the die-cast aluminum alloy, and a structural member for a communications product.
  • die-cast aluminum alloys While maintaining the advantages of conventional aluminum alloys such as high strength, high heat dissipation, and high corrosion resistance, die-cast aluminum alloys feature high fluidity and meet the industrialized die-cast production process, and therefore are widely used in household appliances, automobiles, electronic products and other fields. However, with the development of multi-functional, light and thin products, the structural space is further compressed, especially the fast-paced electronics industry, which puts forward higher requirements for the strength and toughness of die-cast materials.
  • aluminum-magnesium die-cast aluminum alloys Compared with commonly used aluminum-silicon die-cast aluminum alloys, aluminum-magnesium die-cast aluminum alloys have higher strength and excellent flexural toughness. However, because their fluidity is poor and die-cast friendliness is insufficient, aluminum-magnesium die-cast aluminum alloys are limited for use in scenarios such as die-cast parts of thin-walled electronic products (such as medium plates of mobile phones). Therefore, it is necessary to develop a die-cast aluminum alloy with high strength, high toughness, and excellent fluidity.
  • WO 2006/127812 A1 discloses an aluminum alloy, said alloy comprising, in weight percent: about 4 to about 9% Zn; about 1 to about 4% Mg; about 1 to about 2.5% Cu; less than about 0.1% Si; less than about 0.12% Fe; less than about 0.5% Mn; about 0.01 to about 0.05% B; less than about 0.15% Ti; about 0.05 to about 0.2% Zr; about 0.1 to about 0.5% Sc; no more than about 0.05% each miscellaneous element or impurity; no more than about 0.15% total miscellaneous elements or impurities; and remainder Al.
  • US 7 060139 B2 describes a die-cast aluminum alloy, comprising the following components in mass percentages: magnesium: 2.3%, zinc: 7.14%, manganese: 0.27%, iron: 0.12%, silicon: 0.09%, copper: 1.69% zirconium: 0.17%, inevitable impurities ⁇ 0.3%, and aluminum.
  • the present invention provides a die-cast aluminum alloy according to claim 1, a method for preparing the die-cast aluminum alloy according to claim 10, and a structural member for a communications product according to claim 13 comprising the die-cast aluminum alloy, where the die-cast aluminum alloy features high strength, high toughness, and excellent fluidity, so as to resolve the problem to a certain extent that the existing aluminum-magnesium die-cast aluminum alloy has poor fluidity and is limited for use in scenarios such as die-cast parts of thin-walled electronic products.
  • a first aspect of the embodiments of the present invention provides a die-cast aluminum alloy, which includes the following components in mass percentages:
  • the fluidity of the alloy is improved by increasing content of zinc; in addition, content of elements such as magnesium, iron, and manganese is comprehensively controlled, so that the aluminum alloy can achieve good comprehensive mechanics performance such as high strength and high toughness while obtaining excellent fluidity.
  • the mass percentage of zinc is 12%-33%.
  • the mass percentage of zinc is 17%-23%.
  • the mass percentage of magnesium is 2%-6%.
  • the mass percentage of magnesium is 3.3%-5.1%.
  • the mass percentage of iron is 0.12%-0.35%.
  • the mass percentage of iron is 0.2%-0.3%.
  • the mass percentage of manganese is 0.25%-0.7%.
  • the mass percentage of manganese is 0.35%-0.6%.
  • the mass percentage of titanium and/or zirconium is 0.08%-0.12%.
  • the components of the die-cast aluminum alloy further include silicon, and the mass percentage of silicon is greater than 0 and less than or equal to 2.3%.
  • the mass percentage of silicon is 0.5%-1.9%.
  • the mass percentage of silicon is 0.7%-1.6%.
  • the components of the die-cast aluminum alloy further include copper, and the mass percentage of copper is greater than 0 and less than or equal to 2.6%.
  • the mass percentage of copper is 0.3%-2.3%.
  • the mass percentage of copper is 0.7%-1.6%.
  • internal phases of the structure of the die-cast aluminum alloy include an ⁇ -Al phase and intermetallic compounds.
  • the intermetallic compounds are distributed at grain boundary positions or precipitated in the ⁇ -Al phase.
  • Intermetallic compounds include an MgZn 2 phase and an iron-rich phase.
  • the fluidity of the die-cast aluminum alloy is more than 91% of that of the ADC12 die-cast aluminum alloy.
  • yield strength of the die-cast aluminum alloy is ⁇ 240 MPa, and elongation is ⁇ 3%.
  • the die-cast aluminum alloy provided in the first aspect of the embodiments of the present invention features high strength, high toughness, and excellent fluidity, and can greatly alleviate problems about the existing aluminum-magnesium die-cast aluminum alloy, such as low fluidity, poor mold filling, easy to pull molds, and easy to erode molds. Therefore, the die-cast aluminum alloy provided in the first aspect of the embodiments of the present invention can meet molding of a communications product with a complex structure, and is especially applicable to molding of thin-walled products such as medium plates of mobile phones that require high fluidity.
  • an embodiment of the present invention further provides a method for preparing a die-cast aluminum alloy, including the following steps: According to component configuration of the die-cast aluminum alloy, a pure aluminum ingot is first added to a smelting furnace; after the aluminum ingot is melted, a metal element source that can provide element components other than aluminum is added for smelting; and then after the refining and degassing treatment, casting is performed to obtain the die-cast aluminum alloy.
  • the die-cast aluminum alloy includes the following components in mass percentages: magnesium: 0.1%-7%, zinc: 12%-35% manganese: 0.2%-0.8%, iron: 0.1%-0.7%, titanium and/or zirconium: 0.07%-0.2%, optionally silicon: 0%-2.3% and/or copper: 0%-2.6%, unavoidable impurities ⁇ 0.3%, and aluminum.
  • a pure aluminum ingot is added to the melting furnace, heating is performed to reach 730°C-760°C to melt the aluminum ingot.
  • an aluminum-manganese alloy, a pure zinc ingot, iron powder, an aluminum-titanium alloy, and/or an aluminum-zirconium alloy are/is added.
  • a pure magnesium ingot is added, and the compound is stirred and kept warm for 15-25 minutes.
  • the casting temperature is 650°C-720°C.
  • the preparation method provided in the second aspect of the present invention features a simple process, a high yield rate, and low production costs, and is applicable to complex thin-walled parts and similar scenarios, and has broad application prospects.
  • a third aspect of the embodiments of the present invention provides a structural member for a communications product.
  • the structural member for a communications product is cast by using the die-cast aluminum alloy provided in the first aspect of the embodiments of the present invention.
  • the structural member for a communications product includes a medium plate of a mobile phone.
  • the structural member for a communications product provided in the third aspect of the embodiments of the present invention features high strength, high toughness, and excellent forming performance, and can meet design requirements for complex thin-walled structural members.
  • an embodiment of the present invention provides a die-cast aluminum alloy with high strength, high toughness, and excellent fluidity.
  • an embodiment of the present invention provides a die-cast aluminum alloy, which includes the following components in mass percentages:
  • the components of the die-cast aluminum alloy are determined by comprehensively considering the contribution of each chemical element to the comprehensive performance indicators (including fluidity, strength, toughness, hardness, and the like) of the alloy.
  • comprehensive performance indicators including fluidity, strength, toughness, hardness, and the like.
  • internal phases of the structure of the die-cast aluminum alloy include an ⁇ -Al phase and intermetallic compounds.
  • the intermetallic compounds are distributed at grain boundary positions or precipitated in the ⁇ -Al phase.
  • the phase refers to a uniform continuous component with the same chemical composition, the same atomic aggregation state and properties, and there is an interface separation between different phases.
  • the intermetallic compound refers to a compound formed by a metal and a metal, and a metal and a metalloid.
  • the intermetallic compound includes an MgZn 2 phase, an iron-rich phase, and the like.
  • the intermetallic compound when the composition of the die-cast aluminum alloy further includes copper (Cu), the intermetallic compound further includes an Al 2 Cu phase and the like.
  • the intermetallic compound when the composition of the die-cast aluminum alloy further includes silicon (Si), the intermetallic compound further includes an Mg 2 Si phase and the like. Zinc, magnesium, iron, copper, manganese, titanium, and zirconium are partially solid-dissolved in the ⁇ -Al phase in the form of atoms.
  • the components of the die-cast aluminum alloy may further include silicon (Si).
  • the content of silicon (Si) is controlled at a lower level greater than 0 and less than or equal to 2.3%. Due to high brittleness of silicon, the lower content of silicon helps improve the toughness of the aluminum alloy. The addition of a small amount of silicon can reduce the tendency of hot cracking and improve the dimensional stability.
  • Si can be combined with Mg to form Mg 2 Si, ensuring certain strength of the aluminum alloy.
  • the mass percentage of silicon may be 0.5%-1.9%. In some other embodiments, the mass percentage of silicon may alternatively be 0.7%-1.6%. In some embodiments, the mass percentage of silicon may be specifically 0.8%, 1.2%, 1.5%, or 1.7%.
  • magnesium (Mg) is combined with Zn and Si to form strengthening phases MgZn 2 and Mg 2 Si, which significantly improve alloy strengthening.
  • the increase in the magnesium content can improve alloy fluidity to a certain extent.
  • magnesium is easy to burn and has a serious inclusion tendency. Excessive Mg content greatly affects the normal die-cast production and reduces the toughness of the alloy.
  • the content of magnesium is controlled within the range of 0.1%-7%.
  • the mass percentage of magnesium may be 2%-6%.
  • the mass percentage of magnesium may alternatively be 3.3%-5.1%.
  • the mass percentage of magnesium may be specifically 1%, 3%, 4%, 5%, or 6%.
  • an increase in the content of zinc (Zn) can lower a liquidus temperature and improve the fluidity of the alloy.
  • Zn can significantly improve the fluidity of the alloy.
  • Zn can be solid-dissolved in ⁇ -Al to achieve effects of solid dissolution and strengthening, but the strength improvement is limited.
  • adding other elements such as Mg to be combined with Zn to form a second phase (such as an MgZn 2 phase) can significantly improve the strength of the alloy.
  • Mg to be combined with Zn to form a second phase
  • MgZn 2 phase can significantly improve the strength of the alloy.
  • Excessively high content of Zn leads to problems such as reduced corrosion resistance, poor thermal stability, and high thermal cracking tendency, and further increases the alloy density, causing a sharp increase in the product weight.
  • the mass percentage of zinc may alternatively be 12%-33%. In some other embodiments, the mass percentage of zinc may alternatively be 17%-23%. In some other embodiments, the mass percentage of zinc may alternatively be 7%-12%. In some embodiments, the mass percentage of zinc may be specifically 17%, 18%, 19%, 20%, or 22%.
  • the addition of iron (Fe) can alleviate the mucosal tendency in the aluminum alloy die casting process, and ensure the smooth progress of die casting.
  • Fe iron
  • the mass percentage of iron is controlled at 0.1%-0.7%.
  • the mass percentage of iron may alternatively be 0.12%-0.35%.
  • the mass percentage of iron may alternatively be 0.2%-0.3%.
  • the content of Fe is controlled at the middle and lower limit (0.12%-0.35%), which can increase the toughness of the aluminum alloy.
  • the addition of an appropriate amount of manganese can transform the thick needle-like iron-rich phase to form a fine iron-rich phase, to reduce the adverse impact of Fe on the mechanics performance.
  • the addition of manganese can alleviate the mucosal tendency of the aluminum alloy.
  • the mass percentage of manganese is controlled within the range of 0.2%-0.8%. In some embodiments, the mass percentage of manganese may be 0.25%-0.7%. In some other embodiments, the mass percentage of manganese may alternatively be 0.35%-0.6%. In some embodiments, the mass percentage of manganese may be specifically 0.3%, 0.4%, 0.5%, 0.55%, or 0.65%.
  • the components of the die-cast aluminum alloy may further include copper (Cu). Copper has significant effects of solid dissolution and strengthening, and can be combined with Al to form an intermetallic compound Al 2 Cu, further enhancing the strength of the alloy.
  • the mass percentage of copper is ⁇ 2.6%. In some embodiments, the mass percentage of copper may be 0.3%-2.3%. In some other embodiments, the mass percentage of copper may alternatively be 0.7%-1.6%. In some embodiments, the mass percentage of copper may be specifically 0.5%, 0.8%, 1.2%, 1.4%, 1.5%, or 2.0%.
  • titanium (Ti) and zirconium (Zr) can be used as heterogeneous nucleation points to refine crystal grains and improve the strength and toughness of the aluminum alloy.
  • titanium may be added separately, zirconium may be added separately, or titanium and zirconium may be added in combination.
  • the mass percentage of titanium and/or zirconium is 0.07%-0.12%. In some other embodiments, the mass percentage of titanium and/or zirconium may alternatively be 0.08%-0.1%.
  • the sum of the mass percentages of four elements of magnesium, copper, manganese, and titanium may be controlled to be greater than or equal to 4%. In some other embodiments, the sum of the mass percentages of four elements of magnesium, copper, manganese, and titanium may be controlled to be greater than or equal to 6%.
  • the die-cast aluminum alloy includes the following components in mass percentages: silicon: 0.7%-1.6%, zinc: 17%-23%, magnesium: 3.3%-5.1%, copper: 0.7%-1.6%, iron: 0.12%-0.35%, manganese: 0.35%-0.6%, titanium and/or zirconium: 0.07%-0.12%. According to the die-cast aluminum alloy in this embodiment of the present invention, impact of various elements on the performance of the alloy is comprehensively considered.
  • controlling the content of Zn to be 17%-23%, and appropriately adding strengthening elements such as Mg and Cu can achieve better effects of high strength and high toughness, and can further control the alloy weight, the raw material costs, the thermal stability, the corrosion resistance, and the like to be at a better level, thereby better meeting the application requirements of 3C products.
  • the content of the inevitable impurity elements is controlled to be ⁇ 0.3%.
  • the fluidity of the die-cast aluminum alloy is more than 91% of the ADC12 under the same conditions.
  • the yield strength of the die-cast aluminum alloy is ⁇ 240 MPa, and the elongation is ⁇ 3%.
  • the yield strength is a yield limit of a metal material when a yield phenomenon occurs, that is, a stress resisting slight plastic deformation.
  • a stress value that produces 0.2% residual deformation is specified as the yield limit, which is referred to as a conditional yield limit or yield strength.
  • the elongation refers to an index describing the plastic performance of the material, and is a percentage of a ratio of the total deformation ⁇ L of the gauge length section after tensile fracture of a sample to the original gauge length L.
  • the die-cast aluminum alloy provided in the embodiments of the present invention features high strength, high toughness, and excellent fluidity, and can greatly alleviate problems about the existing aluminum-magnesium die-cast aluminum alloy, such as low fluidity, poor mold filling, easy to pull molds, and easy to erode molds. Therefore, the die-cast aluminum alloy provided in the first aspect of the embodiments of the present invention can meet molding of a communications product with a complex structure, and is especially applicable to scenarios of thin-walled parts that require high fluidity. Specifically, the die-cast aluminum alloy can be applied to fields such as mobile phones, notebook computers, communication equipment industries, automobiles, and civil hardware. Specifically, an embodiment of the present invention provides a structural member for a communications product.
  • the structural member for a communications product is cast by using the die-cast aluminum alloy provided in this embodiment of the present invention.
  • the structural member for a communications product includes a medium plate of a mobile phone.
  • other structural members that can be made of aluminum alloy may alternatively be cast by using the die-cast aluminum alloy in this embodiment of the present invention, such as a housing and a bracket.
  • a wall thickness of the structural member for a communications product in this embodiment of the present invention is not particularly limited.
  • the wall thickness may be as large as possible or as small as possible, for example, may be 0.25 mm to 2 mm, and further 0.4 mm to 1 mm.
  • the wall thickness may be a partial wall thickness of the structural member, for example, a wall thickness of more than 50% of the area, or a wall thickness of more than 70% of the area.
  • an embodiment of the present invention further provides a method for preparing a die-cast aluminum alloy, including the following steps:
  • the components of the die-cast aluminum alloy may further include copper. In some embodiments, the components of the die-cast aluminum alloy may further include silicon.
  • the metal element source that can provide other element components other than aluminum may be a pure metal ingot, a master alloy, metal powder, and the like, specifically including a pure zinc ingot, a pure magnesium ingot, an aluminum-silicon alloy, iron powder, an aluminum-manganese alloy, an aluminum-copper alloy, an aluminum-titanium alloy, an aluminum-zirconium alloy, and the like. In an implementation of the present invention, various pure metal ingots and master alloys can be cleaned and dried to remove oxide layers and dirt from the surface.
  • step S10 after a pure aluminum ingot is added to the melting furnace, heating is performed to reach 730°C-760°C to melt the aluminum ingot.
  • an aluminum-manganese alloy, a pure zinc ingot, iron powder, an aluminum-titanium alloy, and/or an aluminum-zirconium alloy are/is added.
  • a pure magnesium ingot is added, and the compound is stirred and kept warm for 15-25 minutes. More specifically, after a pure aluminum ingot is added to the melting furnace, heating is performed to reach 730°C-760°C for 30 minutes to melt the aluminum ingot.
  • an aluminum-manganese alloy, a pure zinc ingot, iron powder, an aluminum-titanium alloy, and/or an aluminum-zirconium alloy are/is added. Then a refining agent is added and slagging is performed, and the compound is kept still and warm for 15 minutes to 25 minutes. Then a pure magnesium ingot is added, and the compound is stirred and kept warm for 15 minutes to 25 minutes.
  • the material temperature that is, the casting temperature
  • the casting temperature is 650°C-720°C.
  • a refining agent dedicated for aluminum alloy is added, argon gas is injected for rotating degassing, and then the compound is kept still and warm for 15 minutes to 20 minutes to fully separate impurities.
  • the refining agent is a commercially available conventional refining agent dedicated for aluminum alloy, and the on-line hydrogen removal and two-stage filtration are conventional operations in the field. This is not particularly limited in the present invention.
  • the mass percentage of silicon may be ⁇ 2.3%. In some embodiments, the mass percentage of silicon may be 0.5%-1.9%. In some other embodiments, the mass percentage of silicon may alternatively be 0.7%-1.6%. In some embodiments, the mass percentage of silicon may be specifically 0.8%, 1.2%, 1.5%, or 1.7%.
  • the mass percentage of magnesium may be 2%-6%. In some other embodiments, the mass percentage of magnesium may alternatively be 3.3%-5.1%. In some embodiments, the mass percentage of magnesium may be specifically 1%, 3%, 4%, 5%, or 6%.
  • the mass percentage of zinc may alternatively be 12%-33%. In some other embodiments, the mass percentage of zinc may alternatively be 17%-23%. In some other embodiments, the mass percentage of zinc may alternatively be 7%-12%.
  • the mass percentage of iron may alternatively be 0.12%-0.35%. In some other embodiments, the mass percentage of iron may alternatively be 0.2%-0.3%.
  • the mass percentage of manganese may be 0.25%-0.7%. In some other embodiments, the mass percentage of manganese may alternatively be 0.35%-0.6%.
  • the mass percentage of copper may be ⁇ 2.6%. In some embodiments, the mass percentage of copper may be 0.3%-2.3%. In some other embodiments, the mass percentage of copper may alternatively be 0.7%-1.6%.
  • titanium may be added separately, zirconium may be added separately, or titanium and zirconium may be added in combination.
  • the mass percentage of titanium and/or zirconium may be 0.07%-0.12%. In some other embodiments, the mass percentage of titanium and/or zirconium may alternatively be 0.08%-0.1 %.
  • the sum of the mass percentages of four elements of magnesium, copper, manganese, and titanium may be controlled to be greater than or equal to 4%. In some other embodiments, the sum of the mass percentages of four elements of magnesium, copper, manganese, and titanium may be controlled to be greater than or equal to 6%.
  • the content of the inevitable impurity elements is controlled to be ⁇ 0.3%.
  • the present invention can further combine existing casting processes (such as liquid die casting and gravity casting) to prepare various molded parts of aluminum alloy, including the structural member for a communications product described in the embodiments of the present invention.
  • existing casting processes such as liquid die casting and gravity casting
  • the preparation method provided in the embodiments of the present invention features a simple process, a high yield rate, and low production costs.
  • the prepared die-cast aluminum alloy features high strength, high toughness, and excellent fluidity, and is applicable to complex thin-walled parts and similar scenarios, and has broad application prospects.
  • a die-cast aluminum alloy includes the following components in mass percentages: silicon: 1.69%, magnesium: 5.62%, zinc: 8.52%, copper: 2.38%, manganese: 0.538%, iron: 0.121%, titanium: 0.104%, zirconium: 0.0015%, content of inevitable impurities is ⁇ 0.3%, and the rest is aluminum.
  • the method for preparing the die-cast aluminum alloy in this example includes the following steps: According to component configuration of the die-cast aluminum alloy, a pure aluminum ingot is first added to a smelting furnace. Heating is performed to reach 730°C-760°C for 30 minutes to melt the aluminum ingot.
  • a pure zinc ingot, an aluminum-silicon alloy, iron powder, an aluminum-manganese alloy, an aluminum-copper alloy, an aluminum-titanium alloy, and an aluminum left-nickel alloy are first added and then a refining agent is added and slagging is performed, and the compound is kept still and warm for 15 minutes to 25 minutes.
  • a pure magnesium ingot is added, and the compound is stirred evenly and kept warm for 15 minutes to 25 minutes.
  • a refining agent dedicated for aluminum alloy is added, argon gas is injected for rotating degassing, and then the compound is kept still for 20 minutes to fully separate impurities.
  • slagging and ashing are performed.
  • online hydrogen removal and two-stage filtration are performed, and casting is performed to form a die-cast aluminum alloy ingot.
  • the casting temperature is 650°C-720°C.
  • the die-cast aluminum alloy in examples 1-3 in the present invention, the conventional Al-Mg-Si series aluminum alloy, and the ADC12 aluminum alloy were tested for mechanics performance and fluidity.
  • Mechanics performance test The die-cast aluminum alloy ingot obtained by casting in examples 1-3 in the present invention is re-melted, heated to 700°C, and a 250T die-cast machine is used to prepare a tensile sample with a diameter of 6 mm in accordance with the provisions of the national standard GB/T228.1-2010 . The yield strength and elongation are tested, and the tensile rate is 1.5 mm/min. The same method is used to test the mechanics performance of the conventional Al-Mg-Si series aluminum alloy and the ADC12 aluminum alloy. The test results are shown in Table 1. Fluidity test: The metal spiral wire method is used to test the fluidity.
  • the fluidity of the die-cast aluminum alloy in the embodiments of the present invention is better than that of the conventional Al-Mg-Si series die-cast aluminum alloy, and is more than 91% of the fluidity of the conventional ADC12 (Al-Si-Cu series) die-cast aluminum alloy.
  • the strength of the aluminum alloy in the multi-element (Zn, Mg, Cu) synergistic strengthening solution in example 2 is better than that of the ultra-high Zn content solution in example 3. Higher Zn content helps improve the fluidity, but leads to excessively high product weight, and reduced thermal stability and corrosion resistance.

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Claims (14)

  1. Aluminium-Druckgusslegierung, die die folgenden Bestandteile als prozentuale Massenanteile umfasst:
    Magnesium: 0,1% bis 7%,
    Zink: 12% bis 35%,
    Mangan: 0,2% bis 0,8%,
    Eisen: 0,1% bis 0,7%,
    Titan und/oder Zirconium: 0,07% bis 0,2%,
    gegebenenfalls Silizium: 0% bis 2,3% und/oder Kupfer: 0% bis 2,6%,
    unvermeidbare Verunreinigungen ≤ 0,3% und Aluminium.
  2. Aluminium-Druckgusslegierung nach Anspruch 1, wobei der prozentuale Massenanteil von Zink 12% bis 33%, vorzugsweise 17% bis 23% beträgt.
  3. Aluminium-Druckgusslegierung nach Anspruch 1, wobei der prozentuale Massenanteil von Silizium 0,5% bis 1,9% beträgt.
  4. Aluminium-Druckgusslegierung nach Anspruch 3, wobei der prozentuale Massenanteil von Silizium 0,7% bis 1,6% beträgt.
  5. Aluminium-Druckgusslegierung nach Anspruch 1, wobei der prozentuale Massenanteil von Kupfer 0,3% bis 2,3% beträgt.
  6. Aluminium-Druckgusslegierung nach Anspruch 5, wobei der prozentuale Massenanteil von Kupfer 0,7% bis 1,6% beträgt.
  7. Aluminium-Druckgusslegierung nach Anspruch 1, wobei innere Phasen einer Struktur der Aluminium-Druckgusslegierung eine α-Al-Phase und intermetallische Verbindungen umfassen; die intermetallischen Verbindungen an der Position von Korngrenzen verteilt sind oder in der α-Al-Phase ausgeschieden sind; intermetallische Verbindungen eine MgZn2-Phase und eine Phase mit hohem Eisengehalt umfassen.
  8. Aluminium-Druckgusslegierung nach einem der Ansprüche 1 bis 7, wobei die Fluidität der Aluminium-Druckgusslegierung unter denselben Bedingungen über 91% der Fluidität einer Aluminium-Druckgusslegierung ADC12 beträgt.
  9. Aluminium-Druckgusslegierung nach einem der Ansprüche 1 bis 8, wobei die Streckgrenze der Aluminium-Druckgusslegierung ≥ 240 MPa beträgt und die Dehnung ≥ 3% beträgt.
  10. Verfahren zum Herstellen einer Aluminium-Druckgusslegierung, das die folgenden Schritte umfasst:
    entsprechend einer Bestandteilgestaltung der Aluminium-Druckgusslegierung wird zuerst ein reiner Aluminiumblock in einen Schmelzofen gegeben; nach dem Schmelzen des Aluminiumblocks wird zum Schmelzen eine Quelle für ein metallisches Element zugegeben, das andere Elementbestandteile als Aluminium liefern kann; und
    anschließend erfolgt nach der Feinungs- und Entgasungsbehandlung das Gießen zum Erhalten der Aluminium-Druckgusslegierung; die Aluminium-Druckgusslegierung umfasst die folgenden Bestandteile als prozentuale Massenanteile: Magnesium: 0,1% bis 7%, Zink: 12% bis 35%, Mangan: 0,2% bis 0,8%, Eisen: 0,1% bis 0,7%, Titan und/oder Zirconium: 0,07% bis 0,2%, gegebenenfalls Silizium: 0% bis 2,3% und/oder Kupfer: 0% bis 2,6%, unvermeidbare Verunreinigungen ≤ 0,3% und Aluminium.
  11. Herstellungsverfahren nach Anspruch 10, wobei nach Zugabe eines reinen Aluminiumblocks in den Schmelzofen eine Erwärmung bis zum Erreichen von 730°C bis 760°C vorgenommen wird, damit der reine Aluminiumblock geschmolzen wird; nach dem vollständigen Schmelzen des Aluminiumblocks eine Aluminium-Mangan-Legierung, ein reiner Zinkblock, Eisenpulver, eine Aluminium-Titan-Legierung und/oder eine Aluminium-Zirconium-Legierung zugegeben wird bzw. werden; nach dem Abkühlen auf 700°C bis 720°C ein reiner Magnesiumblock zugegeben wird und die Mischung 15 bis 25 Minuten lang gerührt und warmgehalten wird.
  12. Herstellungsverfahren nach Anspruch 10, wobei eine Materialtemperatur im Gussvorgang 650°C bis 720°C beträgt.
  13. Konstruktives Bauteil für ein Kommunikationsprodukt, wobei das konstruktive Bauteil für ein Kommunikationsprodukt unter Verwendung der Aluminium-Druckgusslegierung nach einem der Ansprüche 1 bis 9 gegossen wird.
  14. Konstruktives Bauteil für ein Kommunikationsprodukt nach Anspruch 13, wobei das konstruktive Bauteil für ein Kommunikationsprodukt eine Mittelplatte eines Mobiltelefons umfasst.
EP20802262.4A 2019-05-06 2020-04-27 Aluminium-druckgusslegierung, verfahren zu ihrer herstellung und strukturelement für ein kommunikationsprodukt Active EP3954798B1 (de)

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CN110714150B (zh) * 2019-10-15 2021-01-12 Oppo广东移动通信有限公司 铝合金及其制备方法、电子设备结构件和电子设备
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