Classifications

• • 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
• • 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

Definitions

• the present invention relates to a process for producing an aluminium-magnesium alloy and to an alloy produced by the process.
• Be beryllium
• beryllium is mentioned for reducing the oxidation tendency of AlMg melts.
• EP3159422 A1 is added to an AlMg 5 Si 2 Mn alloy.
• One object is to provide a process which provides for the addition of an element or a combination of elements which cause a catalytic reaction and thus promote the formation of a passivation layer on the aluminium melt. By forming the passivation layer, further oxidation of the molten metal and thus undesirable formation of dross is prevented.
• the process according to the invention is directed towards the production of an aluminium-magnesium alloy with a content of at least 1 % Mg, preferably 1 - 7% Mg, more preferably at least 2% Mg, preferably 2 - 7% Mg.
• a content of at least 1 % Mg preferably 1 - 7% Mg, more preferably at least 2% Mg, preferably 2 - 7% Mg.
• 0.01 - 2% calcium (Ca) and 0.01 - 0.3% V are added in the molten state.
• 0.05% - 1 % Ca is added to the alloy in the molten state.
• Ca and V are added as aluminium master alloy during the production of the aluminium-magnesium alloy, preferably the first master alloy contains 10% Ca and 90% Al and the second master alloy contains 10% V and 90% Al.
• Ca and V are added at a melt temperature of 680 - 750°C.
• At least one of the following elements is added to the alloy in the molten state: Iron (Fe), Manganese (Mn), Strontium (Sr), Phosphorus (P), Nickel (Ni), Zinc (Zn), Copper (Cu), Silicon (Si), Titanium (Ti), Chromium (Cr), Molybdenum (Mo), Zirconium (Zr), Hafnium (Hf), Gallium (Ga), Boron (B).
• the following elements are added to the alloy in the molten state in addition to Al, Mg, Ca and V, either individually or as a master alloy:
• this defines a molten metal with a temperature of preferably 680 to 750°C, in which Ca and V can dissolve completely and all other alloying elements are completely dissolved.
• the alloy produced by the process according to the invention is a die-cast alloy.
• An Al-Mg alloy produced by the process according to the invention consists of the following elements:
• an element or element group selected from the group consisting of Cr, Ni, Mo, Zr, Hf, Ga and B, and the balance Al and unavoidable impurities.
• AlMg alloy which is to be protected against oxidation, is left in ambient air at a defined temperature for a certain time in an open crucible. Then the formation of the oxide layer is determined.
• a visible oxide layer appears after a few days, the strength of which is significantly higher than in Al alloys without a Mg content.
• the following 15 test trials were carried out at the Tech Center Rheinfelden.
• the alloys were produced in an open, electrically heated crucible furnace.
• high-pressure die casting trials were carried out and the melt was left in ambient air.
• the casting tests were carried out on a 400 to die casting cell and the produced test plates had the dimensions 260 ⁇ 60 ⁇ 3 mm.
• Tensile specimens were taken from these test plates and the mean values of six specimens were determined.
• 8 kg of melt per test trial was transferred to a small, open crucible. Three of these small crucibles were placed in a larger, electrically heated crucible furnace and left to stand at 700°C for 3 or 10 days.
• compositions V1 to V15 are compositions without beryllium.
• Beryllium is known as an element for improving the oxidation tendency of an AlMg alloy and would falsify the evaluation of the effect of Ca and V.
• the formation of the oxide layer which could be improved with the addition of Ca and V, was assessed on the basis of three predefined classes.
• the aim is an oxide layer according to type A.
• Type B is classified as a poor result and type C as a very poor result for the formation of the oxide layer. This classification, as used in the following examples, is explained in more detail below.
• Type A Very thin oxide layer, which moves with the molten metal. It does not resist mechanical action.
• Type B Thin, semi-solid oxide layer that breaks into pieces when the melt moves. Little resistance to mechanical action.
• Type C Solid oxide layer that does not move with the melt. Considerable resistance to mechanical action. No Si Fe Cu Mn Mg Ca V Ti V1 0,04 1,6 0,001 0,006 4,25 0,00 0,025 0,002 V2 0,04 1,6 0,002 0,005 4,25 0,10 0,025 0,002 V3 0,04 1,6 0,002 0,005 4,25 0,20 0,025 0,003 No Rm [MPa] Rp0,2 [MPa] A [%] Oxide layer 3 days 10 days V1 255 123 14,2 Typ C Typ C 5 V2 254 122 14,1 Typ B Typ B V3 255 123 13,8 Typ A Typ A No Si Fe Cu Mn Mg Ca V Ti V4 0,04 1,2 0,001 0,005 3,8 0,15 0,025 0,004 V5 0,04 1,2 0,002 0,005 3,8 0,15 0,050 0,005 V6 0,04 1,2 0,002 0,005 3,8 0,25 0,050 0,005 No Rm [MPa] Rp0,2 [MPa] A [

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Treatment Of Steel In Its Molten State (AREA)
• Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
• Heat Treatment Of Steel (AREA)

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Publications (1)

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Cited By (1)

Citations (5)

• 2021
  • 2021-12-10 EP EP21213909.1A patent/EP4194575A1/en active Pending
• 2022
  • 2022-12-02 JP JP2024532191A patent/JP2024544764A/ja active Pending
  • 2022-12-02 WO PCT/EP2022/084184 patent/WO2023104652A1/en not_active Ceased
  • 2022-12-02 US US18/717,884 patent/US20260022440A1/en active Pending
  • 2022-12-02 CN CN202280080777.6A patent/CN118541498A/zh active Pending
  • 2022-12-02 CA CA3240203A patent/CA3240203A1/en active Pending
  • 2022-12-02 KR KR1020247018834A patent/KR20240145971A/ko active Pending
  • 2022-12-02 MX MX2024007028A patent/MX2024007028A/es unknown

Patent Citations (5)

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