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
  • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
• • 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

Definitions

• the invention relates to an aluminum casting alloy, in particular an aluminum die casting alloy.
• Die casting technology has developed so far today that it is possible To produce castings with high quality standards.
• the quality of one Die-cast piece depends not only on the machine setting and the selected method, but also to a large extent from the chemical Composition and structure of the cast alloy used. These last two parameters are known to influence the Pourability, the feeding behavior (G. Schindelbauer, J. Czikel “Mold filling capacity and volume deficit of common aluminum die casting alloys " Giessereiforschung 42, 1990, pp. 88/89), the mechanical properties and - particularly important in die casting - the lifespan of the Casting tools (L.A. Norström, B. Klarenfjord, M. Svenson "General Aspects on Wash-out Mechanism in Aluminum Diecasting Dies ", 17th International NADCA Diecasting Congress 1993, Cleveland OH).
• AIMg alloys are also known, which are characterized by high ductility award. Such an alloy is for example in US-A-5 573 606. However, these alloys have the disadvantage of high mold wear and bring problems with shaping what productivity significantly reduced.
• the present invention is therefore based on the object of creating a die-casting alloy with a high elongation at break with an acceptable yield strength, which has good castability and sticks as little as possible in the mold.
• the following minimum values must be achieved in the as-cast state: Elongation (A5): 14% proof stress (Rp 0.2): 100 MPa
• the alloy should also be easy to weld, a high corrosion resistance exhibit and in particular no susceptibility to stress corrosion cracking demonstrate.
• the solution according to the invention is that the alloy 0.5 to 2.0 % By weight magnesium Max. 0.15 % By weight silicon 0.50 to 2.0 Wt% manganese Max. 0.70 Wt% iron Max. 0.10 % Copper Max. 0.05 Wt% chromium Max. 0.10 % By weight zinc Max. 0.20 % By weight titanium 0.10 to 0.60 Wt% cobalt Max. 0.80 % By weight of cerium 0.05 to 0.50 % Zircon 0.005 to 0.15 % By weight vanadium Max. 0.50 % By weight hafnium and aluminum as the rest with further impurities individually max. 0.05% by weight, total max. 0.2% by weight.
• the degree of purity of the aluminum used to produce the alloy corresponds to a hut aluminum of quality Al 99.8 H.
• the alloy content is set as a general condition to keep close to the wrought alloy groups so that when later recycling of alloys used in vehicle construction, for example a reusable alloy system is retained or with mixing associated with an increase in entropy is limited.
• the alloy according to the invention has a well molded ⁇ -phase in the cast state.
• the eutectic predominantly made of Al 6 (Mn, Fe) phases, is very fine and therefore leads to a highly ductile fracture behavior.
• the manganese content prevents sticking in the mold and ensures good mold release.
• the magnesium content in connection with manganese gives the casting a high level of design stability, so that very little or no distortion can be expected even when demolding.
• this alloy can also be used for use thixocasting or thixo forging.
• the ⁇ phase forms in the Remelt immediately, giving excellent thixotropic properties available. At the usual heating speeds, a grain size becomes of ⁇ 100 ⁇ m.
• Zircon increases the proof stress and produces a finer grain, so that the required mechanical properties, in particular the yield strength in the as-cast state, can be achieved.
• the tendency of the casting to stick in the mold can be drastically reduced and the molding behavior can be significantly improved if additional is added to manganese cobalt and / or cerium.
• the alloy preferably contains therefore 0.30 to 0.60% by weight of cobalt and / or 0.05 to 0.80% by weight, in particular 0.10 to 0.50% by weight of cerium. An optimal effect is then achieved if the sum of the contents of cobalt, cerium and manganese in the alloy is at least 1.5% by weight and the alloy is at least 1.4% by weight Contains manganese.
• the alloy contains 0.005 to 0.15% by weight, in particular 0.01 to 0.03 % By weight of vanadium in order to improve the pourability or the flowability. Tests have shown that the mold filling capacity can be determined by a Vanadium addition is significantly improved. It also prevents vanadium the tendency to scratch known with AlMg alloys, in particular because no beryllium is added to the alloy.
• the cast aluminum alloy according to the invention is particularly suitable for thixocasting or thixo forging.
• the alloy is easy to weld, shows excellent casting behavior, a practically negligible tendency to stick and can be shaped well.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Mold Materials And Core Materials (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)
• Continuous Casting (AREA)
• Sealing Battery Cases Or Jackets (AREA)
• Conductive Materials (AREA)
• Forging (AREA)

Priority Applications (10)

Applications Claiming Priority (1)

Publications (1)

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Citations (3)

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• 2000
  • 2000-01-19 EP EP00810040A patent/EP1118685A1/fr not_active Withdrawn
  • 2000-12-27 JP JP2000398674A patent/JP2001220639A/ja active Pending
• 2001
  • 2001-01-08 DE DE50100622T patent/DE50100622D1/de not_active Expired - Lifetime
  • 2001-01-08 MX MXPA01000063A patent/MXPA01000063A/es unknown
  • 2001-01-08 AT AT01810014T patent/ATE250149T1/de not_active IP Right Cessation
  • 2001-01-15 CA CA002330992A patent/CA2330992A1/fr not_active Abandoned
  • 2001-01-18 US US09/764,758 patent/US6306342B2/en not_active Expired - Fee Related
  • 2001-01-18 BR BR0100105-1A patent/BR0100105A/pt not_active IP Right Cessation

Patent Citations (3)

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