EP3301198A1 - Aluminiumlegierung zum druckgiessen und herstellungsverfahren dafür - Google Patents

Aluminiumlegierung zum druckgiessen und herstellungsverfahren dafür Download PDF

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Publication number
EP3301198A1
EP3301198A1 EP17192766.8A EP17192766A EP3301198A1 EP 3301198 A1 EP3301198 A1 EP 3301198A1 EP 17192766 A EP17192766 A EP 17192766A EP 3301198 A1 EP3301198 A1 EP 3301198A1
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Prior art keywords
aluminum alloy
die casting
alloy
present disclosure
aluminum
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EP17192766.8A
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English (en)
French (fr)
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EP3301198B1 (de
Inventor
Sung-Tae Park
Won JU
Jung-Soo Lim
Jeong-Su Han
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • 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
    • C22C21/04—Modified aluminium-silicon alloys
    • 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
    • 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
    • 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
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • 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
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • 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
    • C22F1/05—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 of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions

Definitions

  • Apparatuses and methods consistent with the present disclosure relate to an aluminum alloy for die casting, and more particularly, to an aluminum alloy for die casting including, by wt%, 3 ⁇ Si ⁇ 10, 3 ⁇ Mg ⁇ 10, 0.01 ⁇ Fe ⁇ 1.3, 0.01 ⁇ Zn ⁇ 2, 0.01 ⁇ Cu ⁇ 1.5, 0.01 ⁇ Mn ⁇ 0.5, 0.05 ⁇ Ti ⁇ 0.15, 0.01 ⁇ La ⁇ 2, 0.01 ⁇ Sr ⁇ 2, a balance of Al, and unavoidable impurities, and having improved mechanical properties and corrosion resistance.
  • a die casting method is widely used, and the die casting is precision casting to inject a molten metal into a mold which was precisely machined to a casting shape, thereby obtaining the same casting as the mold.
  • the produced product has correct dimensions, and thus, does not need to be ironed, and has excellent mechanical properties, and with high mass productivity due to a mass production possibility and a low production cost, this method is currently most used in various fields such as automotive parts, electrical equipment, optical instruments and measuring instruments.
  • an Al-Si-based alloy such as ALDC 3, ALDC 10 or ALDC 12, and an Al-Mg alloy such as ALDC 5 or ALDC 6, which have good castability have been used.
  • these aluminum die casting materials have problems in that pores occur in the inside due to air ingress during die casting, mechanical properties are degraded due to occurrence of the pores, when magnesium is contained in a large amount, a molten metal is deposited on the mold surface to shorten the mold life, and the processing time is increased and a tool is damaged due to chip curling during processing.
  • the aluminum die casting materials have poor corrosion resistance, they have limited expansion of coverage.
  • a method of forming a protective coated film on the alloy surface using a physical deposition has been suggested, however, this method has problems in that it needs expensive supplementary equipment, and is difficult to be recycled.
  • Other methods have been suggested, such as ion implantation to implant the ions of elements having corrosion resistance in the alloy surface and laser annealing to inject laser into the alloy surface to form a metastable state on the surface layer.
  • the former has a limitation in an ion implantation depth and, thus, corrosion resistance is rapidly deteriorated when the ion implantation layer is damaged during use.
  • the latter needs separate machining since the size of the product is changed during a treatment process.
  • the need for a new aluminum alloy for die casting arises, the aluminum alloy having excellent mechanical properties and corrosion resistance, and not having a deposit on the mold surface in the course of die casting, even in the case of containing a large amount of magnesium.
  • an alloy for die casting including lanthanum (La) and strontium (Sr) to have improved mechanical properties and corrosion resistance, and a method for manufacturing the same.
  • the aluminum alloy for die casting according to an exemplary embodiment of the present disclosure includes, by wt%, 3 ⁇ Si ⁇ 10, 3 ⁇ Mg ⁇ 10, 0.01 ⁇ Fe ⁇ 1.3, 0.01 ⁇ Zn ⁇ 2, 0.01 ⁇ Cu ⁇ 1.5, 0.01 ⁇ Mn ⁇ 0.5, 0.05 ⁇ Ti ⁇ 0.15, 0.01 ⁇ La ⁇ 2, 0.01 ⁇ Sr ⁇ 2, a balance of Al, and unavoidable impurities.
  • the aluminum alloy for die casting may have a tensile strength of 240 to 270 N/mm 2 , an internal force of 230 to 260 N/mm 2 , and an impact value of 90 to 110 KJ/m 2 .
  • the aluminum alloy for die casting may have a corrosion current of 3.5 to 4.5 ⁇ A, a potential of -660 to -645 V, and a corrosion resistance of 4.9 to 5.6 ⁇ , as measured by a potentiodynamic acceleration test in an environment comprising 5% sodium chloride.
  • an aluminum flange shaft for a washing machine may be manufactured from the alloy for die casting according to an exemplary embodiment of the present disclosure.
  • a method for manufacturing the aluminum alloy for die casting includes: preparing a parent alloy including La and Sr; melting Al, Si, Mg, Fe, Zn, Cu, Mn and Ti in a crucible to include, by wt%, 3 ⁇ Si ⁇ 10, 3 ⁇ Mg ⁇ 10, 0.01 ⁇ Fe ⁇ 1.3, 0.01 ⁇ Zn ⁇ 2, 0.01 ⁇ Cu ⁇ 1.5, 0.01 ⁇ Mn ⁇ 0.5 and 0.05 ⁇ Ti ⁇ 0.15, based on the total weight of the aluminum alloy for die casting; and adding the thus-prepared parent alloy to the crucible to include, by wt%, 0.01 ⁇ La ⁇ 2 and 0.01 ⁇ Sr ⁇ 2, based on the total weight of the aluminum alloy for die casting.
  • adding flux to the crucible may be further included.
  • the parent alloy may be an Al-La-Sr ternary parent alloy, or an Al-Mg-La-Sr quaternary parent alloy.
  • the melting may be carried out at 600 to 700 °C.
  • various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium.
  • application and “program” refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code.
  • computer readable program code includes any type of computer code, including source code, object code, and executable code.
  • computer readable medium includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory.
  • ROM read only memory
  • RAM random access memory
  • CD compact disc
  • DVD digital video disc
  • a "non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals.
  • a non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.
  • FIGS. 1A through 5 discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device.
  • the aluminum alloy for die casting of the present disclosure includes 3 to 10 wt% of silicon (Si), 3 to 10 wt% of magnesium (Mg), 0.01 to 1.3 wt% of iron (Fe), 0.01 to 2 wt% of Zinc (Zn), 0.01 to 1.5 wt% of copper (Cu), 0.01 to 0.5 wt% of manganese (Mn), 0.05 to 0.15 wt% of titanium (Ti), 0.01 to 2 wt% of lanthanum (La), 0.01 to 2 wt% of strontium (Sr), a balance of Al, and unavoidable impurities.
  • the unavoidable impurities included in the alloy may be in a trace amount, and incidental impurities which may be present therein may be B, Cr, Sn, Sr, Pb, Ni, Cd, Ag, Zr, Ca, Mo, other transition metal elements, another rare earth elements, or the like, but not limited thereto.
  • incidental impurities may be varied with the castings, but their presence does not have an influence on the present disclosure, and the total amount of impurities may be less than 0.01 wt%.
  • the aluminum alloy for die casting of the present disclosure includes 3 to 10 wt% of magnesium (Mg).
  • the magnesium component improves tensile strength and also is lighter than Si, thereby being advantageous for weight reduction of a product.
  • the content of magnesium is less than 3 wt%, the effect of increasing tensile strength may not be obtained, and in the case that the content of magnesium is more than 10 wt%, corrosion resistance is deteriorated and stickiness of a molten metal is increased to lower fluidity, leading to deteriorated workability.
  • the aluminum alloy of the present disclosure includes a significantly large amount of magnesium as compared with a conventional Al-Si-based alloy, which is larger than the amount of magnesium in an Al-Mg-based alloy.
  • Such magnesium amount of the present disclosure has a technical significance in that the purpose of higher strength of a product may be achieved, while corrosion resistance and workability are not deteriorated. Due to these characteristics, the alloy of the present disclosure may be applied to the parts of household appliances demanding both strength and high corrosion resistance, and particularly, is advantageous for products which impact is repeatedly applied to and is in contact with water or air.
  • the aluminum alloy according to the present disclosure may be used in the parts such as a flange shaft fixing the drum of a washing machine to be rotated.
  • the aluminum alloy for die casting of the present disclosure includes silicon (Si).
  • the Si component improves the fluidity of the aluminum alloy to improve moldability, lowers a coagulation shrinkage rate to reduce a shrinkage amount, and serves to improve hardness.
  • Si can be added in an amount of 3 to 10 wt%, based on the total weight of the whole alloy, in the aluminum alloy for die casting of the present disclosure. In the case that the content of Si component is less than 3 wt%, the addition effect is negligible, whereas in the case that the content of Si component is more than 10 wt%, a thermal expansion coefficient and an elongation may be lowered, and stains may occur on the surface.
  • the aluminum alloy for die casting of the present disclosure includes iron (Fe).
  • the Fe component reduces adhesion in the mold for die casting to have good castability, and serves to deteriorate erosion of the mold.
  • Fe can be added in an amount of 0.01 to 1.3 wt%, based on the total weight of the whole alloy, in the aluminum alloy for die casting of the present disclosure.
  • the content of Fe component is less than 0.01 wt%, based on the total weight of the whole alloy, it is difficult to release the cast article, whereas in the case that the content of Fe component is more than 1.3 wt%, Al and Si may be bonded to produce vulnerable precipitates, and decrease the corrosion resistance of the aluminum alloy.
  • the aluminum alloy for die casting of the present disclosure includes zinc (Zn).
  • the Zn component has an effect of improving strength and castability of an alloy.
  • Zn can be added in an amount of 0.01 to 2 wt%, based on the total weight of the whole alloy, in the aluminum alloy for die casting of the present disclosure.
  • the content of Zn component is less than 0.01 wt%, based on the total weight of the whole alloy, the improvement of the mechanical properties is negligible, whereas in the case that the content of Zn component is more than 2 wt%, the density of alloy is reduced to cause cracks.
  • the aluminum alloy for die casting of the present disclosure includes manganese (Mn).
  • the Mn component serves to precipitate a Mn-Al6 phase in the alloy to improve the mechanical properties of the alloy by solid solution strengthening and dispersion of fine precipitates.
  • Mn can be added in an amount of 0.01 to 0.5 wt%, based on the total weight of the whole alloy, in the aluminum alloy for die casting of the present disclosure.
  • the improvement of the mechanical properties is negligible, whereas in the case that the content of Mn component is more than 0.5 wt%, the workability may be deteriorated due to adhesion, which is also caused by Mg.
  • the aluminum alloy for die casting of the present disclosure includes copper (Cu).
  • the Cu component has an effect of improving strength and hardness of an alloy.
  • Cu can be added in an amount of 0.01 to 1.5 wt%, based on the total weight of the whole alloy, in the aluminum alloy for die casting of the present disclosure.
  • the content of Cu component is less than 0.01 wt%, based on the total weight of the whole alloy, the improvement of the mechanical properties is negligible, whereas in the case that the content of Cu component is more than 1.5 wt%, corrosion resistance and an elongation may be deteriorated.
  • the aluminum alloy for die casting of the present disclosure includes titanium (Ti).
  • Ti titanium
  • the Ti component may be added to the aluminum alloy to serve to refine crystal grains, and obtain a crack prevention effect, and Ti can be added in an amount of 0.05 to 0.15 wt%, based on the total weight of the whole alloy, in the aluminum alloy for die casting of the present disclosure.
  • the content of Ti component is less than 0.05 wt%, the effect of crystal grain refining may not be obtained, whereas in the case that the content of Ti component is more than 0.15 wt%, the elongation may be decreased.
  • the aluminum alloy for die casting of the present disclosure includes lanthanum (La).
  • the La component is added to the aluminum alloy to have effects of improving the fluidity of the aluminum alloy to improve moldability, improving the deposition properties of the melted alloy on the mold, and improving the corrosion resistance.
  • La has an effect of stabilizing a microcrystalline phase in an aluminum matrix by forming an intermetallic compound with an alloy element such as Cu and Fe.
  • La can be added in an amount of 0.01 to 2 wt%, based on the total weight of the whole alloy, in the aluminum alloy for die casting of the present disclosure.
  • La can be included at 0.01 to 0.5 wt%, based on the total weight of the whole alloy.
  • the aluminum alloy for die casting of the present disclosure includes strontium (Sr).
  • the Sr component may have an effect of improving the strength of an alloy by reducing pores produced by air ingress in the course of die casting, and Sr can added in an amount of 0.01 to 2 wt%, based on the total weight of the whole alloy, in the aluminum alloy for die casting of the present disclosure.
  • the content of Sr component is less than 0.01 wt%, the improvement of the mechanical properties is negligible, whereas in the case that the content of Sr component is more than 2.0 wt%, the distribution of pores is decreased, but the size of pores is increased.
  • Sr can be included at 0.05 to 1.0 wt%, based on the total weight of the whole alloy.
  • Sr also can be included at 0.1 to 0.5 wt%, based on the total weight of the whole alloy.
  • Each component such as aluminum, silicon, iron, copper and titanium, can have a purity of at least about 99%.
  • the aluminum alloy for die casting of the present disclosure includes a large amount of Mg (magnesium) as compared with the conventional aluminum alloy of die casting, it has an effect of improving corrosion resistance. Further, the aluminum alloy for die casting of the present disclosure is not deposited on the mold, and thus, is easily worked, may increase the mold life, and reduces pores produced in the course of die casting to improve mechanical properties such as strength, internal force and an impact value. Accordingly, the problems of increased processing time and damaged processing tools due to chip curling during processing the conventional aluminum alloy may be solved.
  • Mg manganesium
  • an aluminum alloy for die casting having excellent corrosion resistance and mechanical properties was manufactured from silicon, iron, copper, manganese, magnesium, strontium, lanthanum, zinc, titanium and aluminum to have the composition as shown in the following Table 1 (Example). The specific method of manufacturing the aluminum alloy for die casting is described in detail with reference to the following FIG. 5 .
  • an ADC 12 alloy having the composition as shown in the following Table 1 (ADC 12 (found)) was manufactured.
  • Alloy (wt%) Si Fe Cu Mn Mg Sr La Zn Ti Al ADC 12 (average) 9.6-12.0 ⁇ 1.3 1.5-3.5 ⁇ 0.5 ⁇ 0.3 - - ⁇ 1.0 ⁇ 0.3 balance
  • ADC 12 (found) 10.7 0.89 1.76 0.19 0.17 - - 0.7 0.02 balance
  • Example 6.5 0.8 1.0 0.1 6.0 0.15 0.3 0.8 0.1 balance
  • the aluminum alloy as the Example according to the present disclosure manufactured to have the composition as shown in the above Table 1, and ADC 12 as the Comparative Example were dissolved, respectively, maintained at 600 to 700 °C, and then according to the known method, were added to a mold using die casting equipment and subjected to injection and cooling, thereby preparing each specimen.
  • Each specimen after being die cast was immersed in a potassium hydroxide (KOH) solution having a pH of 10 to 11 at 25 °C for 480 hours, and then the surface of each specimen was analyzed using a digital microscope.
  • KOH potassium hydroxide
  • FIGS. 1A and 1B represent analysis of the surface of the specimen formed of ADC 12 which is the conventional aluminum alloy for die casting. Specifically, FIGS. 1A and 1B are magnifications of 50 times and 200 times the surface of the specimen, respectively. Further, FIGS. 2A and 2B represent analysis of the surface of the specimen of the aluminum alloy for die casting manufactured to have the composition as shown in Table 1 according to an exemplary embodiment of the present disclosure. Specifically, FIGS. 2A and 2B are magnifications of 50 times and 200 times the surface of the specimen, respectively.
  • pitting corrosion occurred on the surface of the specimen formed of ADC 12.
  • the pitting corrosion may have a depth of 60 to 100 ⁇ m.
  • exfoliation corrosion was also found in the specimen formed of ADC 12.
  • the pitting corrosion has a small number and a shallow depth on the surface of the manufactured specimen having the composition according to an exemplary embodiment of the present disclosure.
  • the aluminum alloy for die casting according to an exemplary embodiment of the present disclosure including La and Sr has excellent corrosion resistance, despite its higher content of Mg than the conventional aluminum alloy for die casting.
  • the aluminum alloy as the Example according to the present disclosure manufactured to have the composition as shown in the above Table 1, and ADC 12 as the Comparative Example were dissolved, respectively, maintained at 600 to 700 °C, and then added to a mold using die casting equipment and subjected to injection and cooling, thereby preparing each specimen.
  • Each specimen after being die cast was cut into an exposure area of 1 cm 2 , and then the corrosion durability of the specimen was evaluated by a potentiodynamic polarization experiment in an environment comprising 5% sodium chloride (NaCl).
  • the potentiodynamic polarization experiment is an experiment using polarity determined by an electrical displacement difference produced in the course of electricity generation, and current, voltage, resistance or the like may be analyzed by the experiment.
  • the corrosion current (I corr ) of the specimen formed of the aluminum alloy according to an exemplary embodiment of the present disclosure is 4.12 ⁇ A, which means that the specimen has corrosion durability three times more than that of the specimen formed of ADC 12.
  • the specimen formed of the aluminum alloy according to an exemplary embodiment of the present disclosure represents corrosion resistance (Z re ) 1.7 times more than that of the specimen formed of ADC 12, and thus, may be confirmed to have better corrosion durability as compared with that of the conventional aluminum alloy for die casting.
  • the value representing the corrosion durability in the following Table 2 is only an example, and thus, not limited thereto, and the aluminum alloy according to the present disclosure may have a corrosion current of about 3.5 to 4.5 ⁇ A, a potential of about -660 to -645 V, and a corrosion resistance of about 4.9 to 5.6 ⁇ , depending on the change in the content of each component.
  • [Table 2] Classification I corr [ ⁇ A] E [mV] Zre [ ⁇ ] ADC 12 12.68 -608 3.1
  • FIGS. 3A to 3D are drawings representing the corrosion resistance experiment results of ADC 12 which is the conventional aluminum alloy for die casting and the aluminum alloy for die casting manufactured according to the present disclosure, depending on the content of Sr.
  • the Comparative Example illustrated in FIG. 3A was prepared from ADC 12 having the composition as shown in the above Table 1
  • the Example according to the present disclosure illustrated in FIGS. 3B to 3D was prepared by changing the content of Sr in the composition as shown in the above Table 1 into 0 wt%, 0.15 wt% and 0.5 wt%, respectively.
  • the pore size is the smallest when the content of Sr is 0.15 wt%. Further, the pore size when the content of Sr was 0 wt% was 5 to 10 ⁇ m as illustrated in FIG. 3B , however, the pore size when the content of Sr was 0.15 wt% was decreased to less than 5 ⁇ m, as illustrated in FIG. 3C . Accordingly, it is recognized that the aluminum alloy for die casting according to an exemplary embodiment of the present disclosure including La and Sr has excellent corrosion resistance, despite its higher content of Mg than the conventional aluminum alloy for die casting.
  • the pore distribution was the smallest. As illustrated in FIG. 3D , however, the pore size was increased as compared with the pore size when the content of Sr is 0.15 wt%. Thus, the content of Sr can be about 0.15 wt%.
  • the aluminum alloy as the Example according to the present disclosure manufactured to have the composition as shown in the above Table 1, and ADC 12 as the Comparative Example were dissolved, respectively, maintained at 600 to 700 °C, and then, according to the known method, were added to a mold using die casting equipment and subjected to injection and cooling, thereby preparing each specimen.
  • Each specimen after being die cast was cut into 2.9 mm x 23.7 mm, and tensile strength, yield strength, a deformation amount, internal force, an impact value and the like of the specimen were measured according to ASTM standards, using a universal testing machine.
  • the specimen formed of the alloy according to an exemplary embodiment of the present disclosure had tensile strength, 0.2% internal force and an impact value which were all improved as compared with the specimen formed of ADC 12.
  • the mechanical property values of the following Table 3 is only an example, and thus, not limited thereto, and the aluminum alloy according to the present disclosure may have a tensile strength of about 240 to 270 N/mm 2 , an internal force of about 230 to 260 N/mm 2 , and an impact value of about 90 to 110 KJ/m 2 .
  • [Table 3] Classification Tensile strength [N/mm 2 ] 0.2% internal force [N/mm 2 ] Impact value [KJ/m 2 ]
  • FIGS. 4A to 4C are drawings for comparing and describing the strength of Al 6061 which is the conventional aluminum alloy and the aluminum alloy manufactured according to the present disclosure. Specifically, each of FIGS. 4A to 4C represents fragments produced when processing the conventional Al 6061, brass and the alloy according to the present disclosure.
  • Al 6061 and brass may be commercially available alloy products.
  • chip curling refers to curling of the fragments produced from alloy processing without falling off on a tool, and this causes increased processing time and shortened tool life.
  • brass has high strength and hardness, fragments occur in the form of powder when alloy processing, and thus, chip curling does not occur, as illustrated in FIG. 4B .
  • the fragments produced when processing the aluminum alloy according to the present disclosure are in the form of powder, similarly to FIG. 4B .
  • the aluminum alloy according to the present disclosure has improved hardness and strength as compared with Al 6061, the conventional aluminum alloy, and has reduced chip curling, and thus, the shortened processing time of the alloy and the prolonged tool life may be expected.
  • FIG. 5 is a flow chart for describing a process of manufacturing the aluminum alloy for die casting according to the present disclosure.
  • a parent alloy including La and Sr is prepared (S501). Specifically, La and Sr are added to Al according to the composition, and melted together at 600 to 700 °C to prepare an Al-La-Sr ternary parent alloy.
  • Mg is further added to prepare an Al-Mg-La-Sr quaternary parent alloy.
  • the components other than La and Sr in the aluminum alloy of the present disclosure may be added to a crucible according to the composition, and melted at 600 to 700 °C (S520).
  • Al, Si, Mg, Fe, Zn, Cu, Mn and Ti may be added to the crucible to include, by wt%, 3 ⁇ Si ⁇ 10, 3 ⁇ Mg ⁇ 10, 0.01 ⁇ Fe ⁇ 1.3, 0.01 ⁇ Zn ⁇ 2, 0.01 ⁇ Cu ⁇ 1.5, 0.01 ⁇ Mn ⁇ 0.5 and 0.05 ⁇ Ti ⁇ 0.15, based on the total weight of the aluminum alloy for die casting.
  • the crucible may be a graphite crucible. Meanwhile, after completing the melting, a process of adding flux to form an oxidation prevention film on the molten metal surface may be further carried out.
  • the thus-prepared parent alloy may be added to the molten metal according to the composition, and melted together (S530).
  • the parent alloy prepared to include, by wt%, 0.01 ⁇ La ⁇ 2 and 0.01 ⁇ Sr ⁇ 2, based on the total weight of the aluminum alloy for die casting may be added to the molten metal.
  • the parent alloy after adding to the molten metal, the parent alloy may be heated to 600 to 700 °C for 30 to 60 minutes to be completely dissolved.
  • the molten alloy may be added to a mold using die casting equipment according to a known method, and subjected to injection and cooling to produce a product.
  • the alloy may be manufactured more stably without losing components, by preparing the aluminum alloy using the parent alloy including La and Sr.
  • the present disclosure is not limited thereto, and after melting the aluminum alloy not including La and Sr, the parent alloy including La and Sr may be prepared, or the two processes may be carried out simultaneously or individually.
  • the aluminum alloy having excellent fluidity to be easily cast, having a little deposit on the mold surface, and having improved mechanical properties and corrosion resistance may be obtained, by including La and Sr in the aluminum alloy.

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EP17192766.8A 2016-09-29 2017-09-22 Aluminiumlegierung zum druckgiessen und herstellungsverfahren dafür Active EP3301198B1 (de)

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KR1020160125390A KR102591353B1 (ko) 2016-09-29 2016-09-29 다이캐스팅용 알루미늄 합금 및 그 제조 방법

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EP3301198A1 true EP3301198A1 (de) 2018-04-04
EP3301198B1 EP3301198B1 (de) 2021-01-13

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EP3819393A4 (de) * 2018-08-24 2021-08-11 Samsung Electronics Co., Ltd. Aluminiumlegierung zum druckgiessen, verfahren zur herstellung davon und druckgiessverfahren
EP4339315A1 (de) * 2022-09-14 2024-03-20 Suzhou Huijin Smart Materials Technology Co., Ltd. Aluminiumlegierung für ein integralgussteil eines neuen energiefahrzeugs, herstellungsverfahren dafür und anwendung davon

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KR20180070406A (ko) 2016-12-16 2018-06-26 엘지전자 주식회사 다이캐스팅용 알루미늄 합금 및 다이캐스팅 주물
CN110551924B (zh) * 2018-05-30 2021-09-21 比亚迪股份有限公司 铝合金及其制备方法和应用
KR102634398B1 (ko) * 2018-12-10 2024-02-06 현대자동차주식회사 피스톤용 알루미늄 합금 및 차량 엔진용 피스톤
KR101992201B1 (ko) * 2019-02-21 2019-06-24 엘지전자 주식회사 다이캐스팅용 알루미늄 합금 및 다이캐스팅 주물
CN110408824A (zh) * 2019-09-03 2019-11-05 中国工程物理研究院机械制造工艺研究所 一种适用于3d打印的高强铝合金
KR102364642B1 (ko) * 2020-02-06 2022-02-18 주식회사 에스피텍 실리콘과 아연이 첨가된 고강도 다이캐스팅용 알루미늄 합금 및 그 제조방법
CN111647784A (zh) * 2020-06-17 2020-09-11 帅翼驰新材料集团有限公司 高导热高强度压铸铝合金及其制备方法
CN114381639A (zh) * 2022-01-07 2022-04-22 山东创新精密科技有限公司 一种船舶用高强耐蚀铝合金及其制备方法
CN114438378A (zh) * 2022-01-14 2022-05-06 大连理工大学宁波研究院 一种新能源汽车一体化成型铝硅合金及其制备方法
CN116445775A (zh) * 2023-04-20 2023-07-18 上海交通大学 一种高强韧金属型重力铸造铝合金及其制备方法
CN116445772A (zh) * 2023-04-20 2023-07-18 上海交通大学 一种砂型重力铸造铝合金及其制备方法

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EP3819393A4 (de) * 2018-08-24 2021-08-11 Samsung Electronics Co., Ltd. Aluminiumlegierung zum druckgiessen, verfahren zur herstellung davon und druckgiessverfahren
EP4339315A1 (de) * 2022-09-14 2024-03-20 Suzhou Huijin Smart Materials Technology Co., Ltd. Aluminiumlegierung für ein integralgussteil eines neuen energiefahrzeugs, herstellungsverfahren dafür und anwendung davon

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CN107881380A (zh) 2018-04-06
US20180087132A1 (en) 2018-03-29
EP3301198B1 (de) 2021-01-13
KR20180035390A (ko) 2018-04-06
KR102591353B1 (ko) 2023-10-20

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