Classifications

• • 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
  • C22C21/00—Alloys based on aluminium
  • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/007—Semi-solid pressure die casting
• • 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
  • B22D21/002—Castings of light metals
  • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
• • 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

Definitions

• the present disclosure relates to the field of alloys, and in particular to a semi-solid die-casting aluminum alloy and a method for preparing a semi-solid die-casting aluminum alloy casting.
• Die casting is a liquid molding method. Due to the high injection speed, the liquid easily forms turbulent flow in the mold cavity, and the air in the mold cavity is drawn into the product. When the liquid hits the mold, the temperature difference is large, the liquid on the surface is rapidly solidified, which increases the flow resistance of the core liquid, so it cannot be well fused to form a cold partition. Due to the introduction of oxides or some other impurities in the alloy smelting and casting process, the product performance is ultimately lowered.
• die-casting aluminum alloys have been rapidly applied.
• the 1980s 68% of aluminum alloy components in the United States were produced by die-casting technology.
• the die-casting aluminum alloys used in the industry mainly include aluminum-silicon alloys, aluminum-magnesium alloys, aluminum-zinc alloys, aluminum-silicon-copper alloys, and aluminum-silicon-magnesium alloys.
• the most commonly used die-casting alloy for die casting is ADC12, which has a yield strength of about 190 MPa, a tensile strength of about 280 MPa, and an elongation of 2 to 3%, and cannot be strengthened by heat treatment.
• the wrought aluminum alloy (including aluminum alloy for extrusion, forging, rolling, etc.) has high mechanical properties and stable performance, but due to the harsh process conditions and high equipment requirements, it is impossible to form complicated parts, and it is impossible to realize the demands of simplification and integration for automobile parts.
• An objective of the present disclosure is to provide a semi-solid die-casting aluminum alloy and a method for preparing a semi-solid die-casting aluminum alloy casting.
• the semi-solid die-casting aluminum alloy has high strength and high plasticity, can be subjected to high pressure casting, and can form various complicated parts and ensure high mechanical properties.
• the present disclosure provides a semi-solid die-casting aluminum alloy, containing alloying elements, inevitable impurities and the balance of an aluminum element; based on the total weight of the semi-solid die-casting aluminum alloy, the alloying elements include: 7.5 to 9.5 wt% of Si, 3.5 to 4.8 wt% of Cu, 0.5 to 0.75 wt% of Mn, 0.01 to 0.5 wt% of Ti and 0.01 to 0.35 wt% of rare earth element.
• the alloying elements include: 8.0 to 9.0 wt% of Si, 3.5 to 4.5 wt% of Cu, 0.5 to 0.6 wt% of Mn, 0.05 to 0.25 wt% of Ti and 0.15 to 0.25 wt% of rare earth element.
• the rare earth element includes at least one of La, Ce, Pr and Nd.
• the impurities in the semi-solid die-casting aluminum alloy are not more than 0.8 wt%.
• the ratio of the weight content of Ti to Cu is 1:(14 to 90).
• the semi-solid die-casting aluminum alloy includes 7.5 to 9.5 wt% of Si, 3.5 to 4.8 wt% of Cu, 0.5 to 0.75 wt% of Mn, 0.01 to 0.5 wt% Ti, 0.01 to 0.35 wt% of rare earth element, no more than 0.8 wt% of impurities and the balance of aluminum.
• the semi-solid die-casting aluminum alloy includes 8.0 to 9.0 wt% of Si, 3.5 to 4.5 wt% of Cu, 0.5 to 0.6 wt% of Mn, 0.05 to 0.25 wt% Ti, 0.15 to 0.25 wt% of rare earth element, no more than 0.7 wt% of impurities and the balance of aluminum.
• the semi-solid die-casting aluminum alloy has a tensile strength of not less than 370 MPa, a yield strength of not less than 290 MPa, and an elongation of not less than 5.5%.
• the semi-solid die-casting aluminum alloy has a tensile strength of not less than 380 MPa, a yield strength of not less than 300 MPa, and an elongation of not less than 6%.
• the present disclosure further provides a method for preparing a semi-solid die-casting aluminum alloy casting, including: after performing ratio smelting on aluminum alloy raw materials, performing semi-solid die casting to obtain the semi-solid die-casting aluminum alloy casting; where the aluminum alloy raw materials are such that the obtained semi-solid die-casting aluminum alloy casting includes: based on the total weight of the semi-solid die-casting aluminum alloy casting, 7.5 to 9.5 wt% of Si, 3.5 to 4.8 wt% of Cu, 0.5 to 0.75 wt% of Mn, 0.01 to 0.5 wt% of Ti, 0.01 to 0.35 wt% of rare earth element, and the balance of aluminum and inevitable impurities.
• the aluminum alloy raw materials are such that the obtained semi-solid die-casting aluminum alloy casting includes: based on the total weight of the semi-solid die-casting aluminum alloy casting, 8.0 to 9.0 wt% of Si, 3.5 to 4.5 wt% of Cu, 0.5 to 0.6 wt% of Mn, 0.05 to 0.25 wt% of Ti, 0.15 to 0.25 wt% of rare earth element, and the balance of aluminum and inevitable impurities.
• the aluminum alloy raw materials are elemental metals or metal alloys.
• the aluminum alloy raw materials are elemental aluminum or an alloy of aluminum, elemental silicon or an alloy of silicon, elemental copper or an alloy of copper, elemental manganese or an alloy of manganese, elemental titanium or an alloy of titanium, and an elemental rare earth element or an alloy containing a rare earth element.
• the aluminum alloy raw materials are elemental aluminum, an Al-Si alloy, an Al-Ti alloy, an Al-Cu alloy, an Al-Mn alloy and an Al-Re intermediate alloy.
• the purity of the elemental metal is 99.9 wt% or more, and the total content of the alloying elements in the metal alloy is 99.9 wt% or more.
• the adjustment and optimization of the formula and the addition of rare earth elements have the purification effect of removing gases and impurities and the modification effect of refining crystal grains on the alloy melt, and also increase the melt fluidity and enhance the casting properties.
• the method for preparing a semi-solid die-casting aluminum alloy casting of the present disclosure adopts the above semi-solid die-casting aluminum alloy for semi-solid die casting.
• the method can form various complicated components, enhances the mechanical properties of the casting, reduces the defects of the casting, and enhances the yield.
• the present disclosure provides a semi-solid die-casting aluminum alloy, containing alloying elements, inevitable impurities and the balance of an aluminum element; based on the total weight of the semi-solid die-casting aluminum alloy, the alloying elements include: 7.5 to 9.5 wt% of Si, 3.5 to 4.8 wt% of Cu, 0.5 to 0.75 wt% of Mn, 0.01 to 0.5 wt% of Ti and 0.01 to 0.35 wt% of rare earth element.
• the adjustment and optimization of the formula and the addition of rare earth elements have the purification effect of removing gases and impurities and the modification effect of refining crystal grains on the alloy melt, and also increase the melt fluidity and enhance the casting properties.
• the semi-solid die-casting aluminum alloy of the present disclosure when the composition of the semi-solid die-casting aluminum alloy is within the above range, high mechanical properties can be obtained while good casting properties are obtained.
• the semi-solid die-casting aluminum alloy obtained by using the formula has a tensile strength of not less than 370 MPa, a yield strength of not less than 290 MPa, and an elongation of not less than 5.5%.
• the alloying elements include: 8.0 to 9.0 wt% of Si, 3.5 to 4.5 wt% of Cu, 0.5 to 0.6 wt% of Mn, 0.05 to 0.25 wt% of Ti and 0.15 to 0.25 wt% of rare earth element.
• the semi-solid die-casting aluminum alloy obtained according to the formula has a tensile strength of not less than 380 MPa, a yield strength of not less than 300 MPa, and an elongation of not less than 6%.
• the kind of the rare earth element is not particularly limited, may be a conventional kind well known to those skilled in the art, and may be a single kind of rare earth element or mixed rare earths.
• the rare earth element may include at least one of La, Ce, Pr and Nd, and the relative content of each rare earth element is also not particularly required.
• the above rare earth element may be a commercially available product and is industrial mixed rare earths.
• the purity of the semi-solid die-casting aluminum alloy is one of the important factors affecting the performance of the aluminum alloy.
• the impurities in the semi-solid die-casting aluminum alloy are not more than 0.8 wt%.
• the addition of the metal element titanium in the semi-solid die-casting aluminum alloy can refine the crystal grains, enhance the strength and plasticity of the alloy, improve the fluidity of the alloy and enhance the casting properties.
• the added metal element copper can form a Ti 2 Cu 3 phase with titanium and be distributed at the grain boundary, so that the grain boundary slip during alloy stretching is effectively suppressed, thereby enhancing the strength of the alloy.
• the ratio of the weight content of Ti to Cu may be 1:(7 to 350), preferably 1:(14 to 90).
• the semi-solid die-casting aluminum alloy may include 7.5 to 9.5 wt% of Si, 3.5 to 4.8 wt% of Cu, 0.5 to 0.75 wt% of Mn, 0.01 to 0.5 wt% Ti, 0.01 to 0.35 wt% of rare earth element, no more than 0.8 wt% of impurities and the balance of aluminum.
• the semi-solid die-casting aluminum alloy may include 8.0 to 9.0 wt% of Si, 3.5 to 4.5 wt% of Cu, 0.5 to 0.6 wt% of Mn, 0.05 to 0.25 wt% Ti, 0.15 to 0.25 wt% of rare earth element, no more than 0.7 wt% of impurities and the balance of aluminum.
• the present disclosure further provides a method for preparing a semi-solid die-casting aluminum alloy casting, including: after performing ratio smelting on aluminum alloy raw materials, performing semi-solid die casting to obtain the semi-solid die-casting aluminum alloy casting, where the aluminum alloy raw materials are such that the obtained semi-solid die-casting aluminum alloy casting includes: based on the total weight of the aluminum alloy casting, 7.5 to 9.5 wt% of Si, 3.5 to 4.8 wt% of Cu, 0.5 to 0.75 wt% of Mn, 0.01 to 0.5 wt% of Ti, 0.01 to 0.35 wt% of rare earth element, and the balance of aluminum and inevitable impurities.
• the aluminum alloy raw materials are such that the obtained semi-solid die-casting aluminum alloy casting includes: based on the total weight of the semi-solid die-casting aluminum alloy casting, 8.0 to 9.0 wt% of Si, 3.5 to 4.5 wt% of Cu, 0.5 to 0.6 wt% of Mn, 0.05 to 0.25 wt% of Ti, 0.15 to 0.25 wt% of rare earth element, and the balance of aluminum and inevitable impurities.
• the melting may be performed in a smelting furnace, and the aluminum alloy raw materials added to the smelting furnace may be simple substances or metal alloys, as long as the composition of the aluminum alloy obtained by smelting the added aluminum alloy raw materials is within the above range.
• the aluminum alloy raw materials may be elemental aluminum or an alloy of aluminum, elemental silicon or an alloy of silicon, elemental copper or an alloy of copper, elemental manganese or an alloy of manganese, elemental titanium or an alloy of titanium, and an elemental rare earth element or an alloy containing a rare earth.
• the above aluminum alloy raw materials are elemental aluminum, an Al-Si alloy, an Al-Ti alloy, an Al-Cu alloy, an Al-Mn alloy and an Al-Re intermediate alloy. Further, to prevent the introduction of impurities from affecting the performance of the aluminum alloy, the purity of the elemental metal is 99.9 wt% or more, and the total content of the alloying elements in the alloy is 99.9 wt% or more.
• the semi-solid die-casting aluminum alloy casting is obtained by performing semi-solid die casting after performing ratio smelting on the aluminum alloy raw materials.
• the smelting and semi-solid die casting can employ conventional methods and operating conditions, and the present disclosure does not impose any particular requirements.
• the smelting process may adopt the existing steps of material preparation ⁇ melting ⁇ refining ⁇ slag removing ⁇ casting.
• the method for preparing a semi-solid die-casting aluminum alloy casting of the present disclosure may include the following steps:
• the aluminum alloy and a method for preparing the same of the present disclosure are further described below by way of embodiments. However, the present disclosure is not limited to the embodiments listed below.
• the rare earth element is mixed rare earths (containing 39.8 wt% of La and 58.8 wt% of Ce).
• This embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing a semi-solid die-casting aluminum alloy casting of the present disclosure.
• the semi-solid die-casting aluminum alloy included: based on the total weight of the semi-solid die-casting aluminum alloy, 8.5 wt% of Si, 4.0 wt% of Cu, 0.55 wt% of Mn, 0.15 wt% of Ti, 0.20 wt% of rare earth element, and the balance of aluminum.
• the aluminum ingot, the Al-Si intermediate alloy, the Al-Ti intermediate alloy, the Al-Cu intermediate alloy, the Al-Mn intermediate alloy and the Al-Re intermediate alloy ingot measured according to the above semi-solid die-casting aluminum alloy composition were placed into a crucible coated with a covering agent and preheated to 220°C, and were heated and melted after the addition of the covering agent, and the alloys were stirred uniformly after fully melted, where the melting process was 2.5 h, and the final temperature of the aluminum alloy melt was 750°C; at 700 to 720°C, a bell jar was used to press the refining agent hexachloroethane into about 2/3 below the surface of the melt in batches, and was rotated clockwise uniformly and slowly, for refining for 8 min where the amount of hexachloroethane was 0.5 wt% of the charge; after fully refining, the bell jar was taken out, the residual oxides were removed, and the inclusions on the surface of the melt were removed
• This embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing a semi-solid die-casting aluminum alloy casting of the present disclosure.
• Embodiment 1 The method of Embodiment 1 was employed, except that the semi-solid die-casting aluminum alloy included: based on the total weight of the semi-solid die-casting aluminum alloy, 9.5 wt% of Si, 3.5 wt% of Cu, 0.5 wt% of Mn, 0.01 wt% of Ti, 0.01 wt% of rare earth element and the balance of aluminum, thereby obtaining the aluminum alloy casting A2 of this embodiment.
• This embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing a semi-solid die-casting aluminum alloy casting of the present disclosure.
• Embodiment 1 The method of Embodiment 1 was employed, except that the semi-solid die-casting aluminum alloy included: based on the total weight of the semi-solid die-casting aluminum alloy, 7.5 wt% of Si, 4.8 wt% of Cu, 0.75 wt% of Mn, 0.5 wt% of Ti, 0.35 wt% of rare earth element and the balance of aluminum, thereby obtaining the aluminum alloy casting A3 of this embodiment.
• This embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing a semi-solid die-casting aluminum alloy casting of the present disclosure.
• Embodiment 1 The method of Embodiment 1 was employed, except that the semi-solid die-casting aluminum alloy included: based on the total weight of the semi-solid die-casting aluminum alloy, 9.0 wt% of Si, 4.4 wt% of Cu, 0.52 wt% of Mn, 0.10 wt% of Ti, 0.15 wt% of rare earth element and the balance of aluminum, thereby obtaining the aluminum alloy casting A4 of this embodiment.
• This comparative embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing a aluminum alloy casting different from the present disclosure.
• Embodiment 1 The method and the raw materials of Embodiment 1 were employed except that no rare earth element was added, thereby obtaining the aluminum alloy casting B1 of this comparative embodiment.
• This comparative embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing an aluminum alloy casting different from the present disclosure.
• Embodiment 1 The method and the raw materials of Embodiment 1 were employed except that the content of the rare earth element in the semi-solid die-casting aluminum alloy was 0.5 wt%, thereby obtaining the aluminum alloy casting B2 of this comparative embodiment.
• This comparative embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing the aluminum alloy casting different from the present disclosure.
• Embodiment 1 The method and the raw materials of Embodiment 1 were employed except that the content of the Si in the semi-solid die-casting aluminum alloy was 10 wt%, thereby obtaining the aluminum alloy casting B3 of this comparative embodiment.
• This comparative embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing an aluminum alloy casting different from the present disclosure.
• Embodiment 1 The method and the raw materials of Embodiment 1 were employed except that the content of the Si in the semi-solid die-casting aluminum alloy was 7 wt%, thereby obtaining the aluminum alloy casting B4 of this comparative embodiment.
• This comparative embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing the aluminum alloy casting different from the present disclosure.
• Embodiment 1 The method and the raw materials of Embodiment 1 were employed except that the content of the Cu in the semi-solid die-casting aluminum alloy was 5 wt%, thereby obtaining the aluminum alloy casting B5 of this comparative embodiment.
• This comparative embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing an aluminum alloy casting different from the present disclosure.
• Embodiment 1 The method and the raw materials of Embodiment 1 were employed except that the content of the Cu in the semi-solid die-casting aluminum alloy was 3 wt%, thereby obtaining the aluminum alloy casting B6 of this comparative embodiment.
• This comparative embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing an aluminum alloy casting different from the present disclosure.
• Embodiment 1 The method of Embodiment 1 was employed except that a commercially available ADC12 aluminum alloy ingot was used as the ingot, thereby obtaining the aluminum alloy sample B7.
• This comparative embodiment is for explaining a semi-solid die-casting aluminum alloy and a method for preparing an aluminum alloy casting different from the present disclosure.
• Embodiment 1 The method of Embodiment 1 was employed except that a commercially available A356.2 aluminum alloy ingot was used as the ingot, thereby obtaining the aluminum alloy sample B8.
• This comparative embodiment is for explaining a die-casting aluminum alloy and a method for preparing an aluminum alloy casting different from the present disclosure.
• Embodiment 1 The raw materials of Embodiment 1 were employed except that a conventional die casting method was used, thereby obtaining the aluminum alloy sample B9.
• This comparative embodiment is for explaining a die-casting aluminum alloy and a method for preparing an aluminum alloy casting different from the present disclosure.
• AlMn10 aluminum-manganese alloy
• AlSi12 aluminum-silicon alloy
• AlFe10 aluminum-iron alloy
• Al-50Cu aluminum-copper alloy
• pure magnesium 99.9, pure zinc (99.95)
• an aluminum-titanium-carbon-boron alloy, magnesium-lanthanum-cerium (Mg-LaCe) and magnesium-yttrium (Mg-Y) were subjected to mixture calculation, smelting and pouring.
• the contents of the main elements of the finally obtained alloy were as follows: Si: 6.0 wt%, Cu: 0.5 wt%, Fe: 0.42 wt%, Mn: 0.05 wt%, Mg: 1.0 wt%, Zn: 1.5 wt%, Ti: 0.05 wt%, C: 0.002 wt%, LaCe: 0.20 wt%, Y: 0.12 wt%, and the balance of Al and inevitable impurities.
• a conventional die casting method was employed to obtain the aluminum alloy sample B10.
• This comparative embodiment is for explaining a die-casting aluminum alloy and a method for preparing an aluminum alloy casting different from the present disclosure.
• the semi-solid die-casting aluminum alloy of the present disclosure has good mechanical properties and casting properties, and the semi-solid die-casting aluminum alloy has a tensile strength of not less than 370 MPa, a yield strength of not less than 290 MPa, and an elongation of not less than 5.5%.
• the optional alloying elements in the present disclosure include: 8.0 to 9.0 wt% of Si, 3.5 to 4.5 wt% of Cu, 0.5 to 0.6 wt% of Mn, 0.05 to 0.25 wt% of Ti and 0.15 to 0.25 wt% of rare earth element, the semi-solid die-casting aluminum alloy obtained according to the formula has a tensile strength of not less than 380 MPa, a yield strength of not less than 300 MPa, and an elongation of not less than 6%.

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• 2016
  • 2016-12-02 CN CN201611096735.4A patent/CN108149083B/zh active Active
• 2017
  • 2017-11-16 WO PCT/CN2017/111382 patent/WO2018099272A1/fr unknown
  • 2017-11-16 US US16/465,321 patent/US20190390305A1/en not_active Abandoned
  • 2017-11-16 EP EP17877267.9A patent/EP3550046A4/fr not_active Withdrawn

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